Imagine tiny, tiny building blocks. These blocks are called atoms. When two or more of these atoms stick together, they form a molecule.
Think of it like LEGOs. One LEGO brick is like an atom. If you put two or more LEGO bricks together, you have a small LEGO model.
A molecule is like that small LEGO model, but super, super tiny! It's the smallest piece of something that still acts like that thing.
Imagine building blocks, but super tiny! A molecule is like a little group of these tiny blocks, called atoms, that are stuck together.
It's the smallest piece of something, like water or sugar, that still acts like that thing.
These groups of atoms always have the same parts, and they hold onto their special qualities.
So, a molecule is like a mini-team of atoms that stays together and keeps its own identity.
Imagine building blocks, but super tiny! A molecule is like a little group of these building blocks (called atoms) that are stuck together.
It's the smallest bit of something, like water or sugar, that still acts like that thing. So, a water molecule is the smallest piece of water you can have that is still water.
These atoms are connected by special forces, like invisible glue. When they join up, they make a molecule.
It can exist on its own and still keep all the special qualities of that substance. Isn't that neat?
A molecule is the smallest particle of a substance that can exist independently and still show the properties of that substance.
Think of it like a tiny building block.
It's made up of two or more atoms that are connected together by special forces called chemical bonds.
For example, a water molecule is made of two hydrogen atoms and one oxygen atom.
When we refer to "molecule" as a verb, it's typically used in a more figurative or specialized context rather than a common transitive verb. It describes the process by which individual components or ideas coalesce or come together to form a more complex, unified whole.
Think of it as the act of smaller elements interacting and bonding, much like atoms forming a molecule, to create something greater than the sum of its parts. This can apply to various scenarios, such as disparate ideas molecularly linking to form a comprehensive theory or individual efforts molecularly combining to achieve a collective goal.
When we refer to "molecule" as a verb, it's typically used in a more figurative or specialized context, as it's primarily a noun. However, if we were to imagine its verbal use, it could imply the act of forming or combining into a molecular structure, or perhaps breaking down into individual molecules. This could be seen in fields like chemistry or materials science where processes involve the manipulation of matter at a molecular level. Thus, to "molecule" something would be to engage in a transformation involving these fundamental units.
molecule 30秒了解
- A molecule is the smallest unit of a chemical substance that can exist independently.
- It retains its chemical properties and is made up of two or more atoms.
- These atoms are held together by chemical bonds.
§ What Does 'Molecule' Mean?
The term 'molecule' is fundamental to understanding chemistry and the world around us. At its core, a molecule refers to the smallest unit of a chemical substance that can exist independently while still retaining all of its chemical properties. Think of it as the basic building block of any compound or element when it's not in its atomic form. These tiny structures are formed when two or more atoms are held together by strong forces called chemical bonds.
- DEFINITION
- A molecule is the smallest unit of a chemical substance that can exist independently while retaining its chemical properties. It consists of two or more atoms held together by chemical bonds.
To clarify, atoms are the most basic units of matter, like individual Lego bricks. When these Lego bricks connect to each other, they form a more complex structure – that's a molecule. The type of atoms involved and how they are bonded determine the properties of the resulting molecule. For instance, a water molecule (H₂O) is made up of two hydrogen atoms and one oxygen atom. This specific arrangement gives water its unique properties, such as being a liquid at room temperature and an excellent solvent.
§ When Do People Use It?
The term 'molecule' is primarily used in scientific contexts, especially in chemistry, biology, and physics, but it also appears in everyday language when discussing substances at a microscopic level. Understanding molecules is crucial for comprehending how matter interacts, how chemical reactions occur, and how life itself functions.
- In Chemistry: Chemists constantly talk about molecules. They study their structures, how they bond, how they react with other molecules, and how to synthesize new ones. For example, when creating a new drug, scientists design and synthesize specific molecules to achieve a desired effect in the body.
- In Biology: Biologists use the term to describe the building blocks of living organisms. DNA, proteins, carbohydrates, and lipids are all large and complex molecules essential for life. Understanding these biological molecules helps us comprehend genetics, disease, and biological processes.
- In Physics: Physicists might discuss the behavior of molecules in different states of matter (solid, liquid, gas) or how they interact with energy, such as light or heat.
- In Everyday Language: While less formal, you might hear or read about molecules in news articles about health, environmental issues, or new technologies. For instance, discussions about air pollution often mention pollutant molecules, or articles about nutrition might refer to nutrient molecules.
Here are some examples of how the word 'molecule' is used:
The oxygen molecule we breathe is actually made up of two oxygen atoms bonded together (O₂).
Scientists are trying to design new molecules that can target cancer cells specifically.
Sugar is a complex molecule that provides energy to our bodies.
In summary, a molecule is a fundamental concept for understanding the composition and behavior of matter. It's a word that bridges the gap between the abstract world of atoms and the tangible world of chemical substances and biological structures. Whether you're studying science or just reading about the world, encountering the term 'molecule' will help you grasp the tiny yet incredibly significant units that make up everything around us.
§ Understanding 'Molecule' in Context
The word 'molecule' is a noun. It refers to the smallest particle of a substance that still has all the properties of that substance. These tiny particles are made up of two or more atoms joined together.
§ Common Usage and Grammar
When using 'molecule' in a sentence, you'll typically find it in scientific or academic contexts, but it can also appear in more general discussions about chemistry or biology. It often takes articles like 'a', 'an', or 'the', and can be used in both singular and plural forms.
- Singular
- A single unit of a chemical substance.
Water is a simple molecule made of two hydrogen atoms and one oxygen atom.
- Plural
- Multiple units of a chemical substance.
Proteins are large molecules essential for life.
§ Prepositions with 'Molecule'
When discussing 'molecules', various prepositions can be used to describe their composition, interactions, or location.
- of: to indicate what something is made of.
A molecule of oxygen consists of two oxygen atoms.
- in: to indicate location or presence within something larger.
There are countless molecules of air in this room.
- between: to describe interactions.
The bonds between water molecules are responsible for its surface tension.
- from: to indicate origin or source.
The carbon dioxide molecules released during respiration come from our cells.
§ Additional Examples
Here are a few more examples to help you understand how 'molecule' can be used in different contexts.
Scientists are studying how these complex molecules interact.
The drug works by targeting specific molecules in the body.
Each molecule of sugar provides energy.
The air is full of nitrogen and oxygen molecules.
§ Where you actually hear this word
The word "molecule" is a fundamental term in chemistry and biology, so you'll primarily encounter it in academic and scientific contexts. However, its importance extends to everyday life, particularly when discussing health, environmental issues, and product information. Understanding where and how this word is used can significantly enhance your comprehension of scientific concepts and news.
§ School and Academic Settings
In school, especially in science classes like chemistry, biology, and physics, "molecule" is a core vocabulary word. You'll hear it in lectures, textbooks, and discussions. For instance, when learning about the composition of water, your teacher will explain that a water molecule is made up of two hydrogen atoms and one oxygen atom. Similarly, in biology, when studying DNA, you'll learn about the complex molecules that carry genetic information.
- DEFINITION
- A molecule is the smallest unit of a chemical substance that can exist independently while retaining its chemical properties. It consists of two or more atoms held together by chemical bonds.
The teacher explained how a single molecule of sugar is composed of carbon, hydrogen, and oxygen atoms.
Beyond basic science, in higher education, particularly in university-level chemistry and biochemistry, the term is used in much more detail. You'll delve into the structures of complex organic molecules, their reactions, and their roles in biological systems. Researchers in these fields use the term constantly to describe their experiments and findings.
- In organic chemistry, professors discuss the intricate structures of large organic molecules.
- Biology textbooks often illustrate how protein molecules fold into specific shapes to perform their functions.
§ Work and Professional Environments
In many professional fields, "molecule" is a standard part of the jargon. Scientists, engineers, and healthcare professionals regularly use the word. For example, in the pharmaceutical industry, researchers work to design new drug molecules that can target specific diseases. In environmental science, experts analyze pollutant molecules in the air and water. Food scientists might study the molecules responsible for flavor and preservation.
The team of chemists successfully synthesized a new molecule with potential anticancer properties.
§ News and Popular Science
The media often uses "molecule" when reporting on scientific discoveries, health news, and environmental issues. You might hear about "breakthrough molecules" in drug development or discussions about "toxic molecules" in pollution reports. Science documentaries and popular science books also frequently use the term to explain complex concepts to a general audience. While the news might simplify complex scientific details, the term "molecule" itself is usually used accurately to refer to the basic chemical units.
- News reports frequently highlight the discovery of new molecules in space or deep-sea environments.
- Environmental agencies often publish data on the concentration of specific pollutant molecules in drinking water.
In everyday conversations, while people might not use "molecule" as frequently as in scientific discourse, it can still appear when discussing the tiny components of things around us. For example, someone might say, "There are tiny molecules of dust in the air." This informal use, though less precise than a scientific definition, still conveys the idea of very small, fundamental particles.
A journalist reported on how scientists identified the specific molecule responsible for the distinctive scent of a rose.
To summarize, the word "molecule" is most commonly encountered in educational, scientific, and professional settings. From school classrooms to research laboratories and news headlines, its usage is vital for communicating fundamental concepts in chemistry, biology, and related fields. Being familiar with this term will significantly aid your understanding of the world around you, from the composition of everyday substances to groundbreaking scientific discoveries.
§ Mistakes People Make with This Word
The word "molecule" is a fundamental concept in chemistry, and while its definition seems straightforward, there are several common misconceptions and errors people make when using it. Understanding these can help in mastering its correct usage.
§ Misconception 1: Confusing Molecules with Atoms
One of the most frequent mistakes is using "molecule" and "atom" interchangeably. While related, they are distinct entities.
- DEFINITION
- An atom is the basic unit of matter, consisting of a dense central nucleus surrounded by a cloud of negatively charged electrons. It is the smallest particle of a chemical element.
A molecule, as defined, is a combination of two or more atoms. So, while all molecules are made of atoms, not all atoms are part of a molecule (e.g., noble gases like Helium exist as individual atoms).
Correct: A water molecule consists of two hydrogen atoms and one oxygen atom.
Incorrect: Oxygen is a single molecule.
(Correct: Oxygen usually exists as a diatomic molecule, O2, but a single oxygen atom is not a molecule on its own.)
§ Misconception 2: Assuming All Chemical Substances are Molecules
While many chemical substances are composed of molecules, not all are. Ionic compounds, for instance, form crystal lattices of ions, not discrete molecules.
- DEFINITION
- An ionic compound is a chemical compound comprising ions held together by electrostatic forces termed ionic bonding. The compound is neutral overall, but consists of positively charged ions called cations and negatively charged ions called anions.
For example, sodium chloride (table salt) is an ionic compound. It does not exist as individual NaCl molecules but as a crystal lattice where Na+ and Cl- ions are arranged in a repeating pattern.
Correct: Water is composed of molecules.
Incorrect: Sodium chloride consists of NaCl molecules.
§ Misconception 3: Believing all Molecules are Complex
While some molecules, like proteins or DNA, are incredibly complex, many are quite simple, consisting of just two atoms.
- Diatomic molecules: These are molecules made up of two atoms of the same element.
Examples include oxygen (O2), nitrogen (N2), and hydrogen (H2). Each is a molecule.
Even though they are simple, they still fit the definition of a molecule as they consist of two or more atoms held together by chemical bonds.
§ Misconception 4: Using "Molecule" in a Non-scientific Context Loosely
Sometimes, people use "molecule" metaphorically or loosely in everyday language, which can sometimes lead to confusion about its precise scientific meaning.
Colloquial (less precise): "He didn't have a single lazy molecule in his body." (Here, "molecule" is used to imply even the smallest part.)
While this usage is generally understood, it's important to remember that in scientific contexts, "molecule" has a very specific and strict definition.
§ Key Takeaways for Using "Molecule" Correctly
- A molecule always consists of two or more atoms.
- These atoms must be held together by chemical bonds.
- Molecules are the smallest independent units of a chemical substance that retain its properties.
- Not all chemical substances are molecular (e.g., ionic compounds).
- Molecules can be simple (diatomic) or complex (macromolecules).
By keeping these points in mind, you can avoid common pitfalls and use the word "molecule" with greater accuracy and confidence in both scientific and general conversations.
§ Similar words and when to use this one vs alternatives
The word 'molecule' primarily functions as a noun, referring to a fundamental unit in chemistry. It describes the smallest particle of a chemical compound or elemental substance that retains the chemical properties of that substance and is composed of two or more atoms bonded together. Given that the prompt mistakenly categorizes 'molecule' as a verb, this response will clarify its proper usage as a noun and then explore similar terms that are often confused with or related to 'molecule', explaining their nuances and appropriate contexts.
It's important to first correct the classification: 'molecule' is a noun, not a verb. There is no common verb form of 'molecule' in English. If one wished to describe the process of forming molecules, one might use verbs like 'synthesize', 'bond', or 'combine', but not 'molecule' itself. Now, let's delve into words that are sometimes used in proximity to or in comparison with 'molecule'.
§ Atom
- DEFINITION
- The smallest unit of ordinary matter that forms a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms.
Water is composed of two hydrogen atoms and one oxygen atom.
While molecules are made of atoms, an atom is a more fundamental building block. An atom can exist independently, but it may or may not retain the chemical properties of a larger substance if it's part of a compound. For example, a single oxygen atom doesn't have the same properties as an oxygen molecule (O2) or water molecule (H2O). Use 'atom' when referring to the individual, indivisible units that make up all matter, and 'molecule' when referring to two or more atoms bonded together that form a distinct chemical entity.
§ Compound
- DEFINITION
- A substance formed when two or more chemical elements are chemically bonded together.
Carbon dioxide is a chemical compound formed from carbon and oxygen.
A compound refers to the macroscopic substance, while a molecule is the smallest discrete unit of that substance. All compounds are made of molecules (or formula units for ionic compounds), but not all molecules are compounds (e.g., O2 is a molecule but an element, not a compound). Use 'compound' when discussing the overall substance with distinct chemical properties, and 'molecule' when referring to the individual, microscopic units that compose that compound.
§ Particle
- DEFINITION
- A minute fragment or quantity of matter.
Dust particles are visible in the sunlight.
'Particle' is a much broader term than 'molecule'. It can refer to anything from a subatomic particle to a grain of sand. A molecule is a specific type of particle. Use 'particle' when you need a general term for a small piece of matter without specifying its chemical structure, and 'molecule' when you are specifically referring to a chemically bonded group of atoms.
§ Ion
- DEFINITION
- An atom or molecule with an electric charge due to the loss or gain of one or more electrons.
Sodium chloride dissolves in water to form sodium and chloride ions.
An ion is an atom or molecule that has gained or lost electrons, thus carrying an electric charge. So, a molecule can be an ion (a polyatomic ion), but not all ions are molecules (e.g., a single charged atom like Na+ is an ion but not a molecule). Use 'ion' when the electrical charge of the species is significant to the context, and 'molecule' when referring to a neutrally charged, chemically bonded group of atoms.
§ Macromolecule
- DEFINITION
- A very large molecule, such as a protein, nucleic acid, or synthetic polymer.
DNA is a complex macromolecule that carries genetic information.
A macromolecule is essentially a very large molecule. All macromolecules are molecules, but not all molecules are macromolecules. The distinction is primarily about size and complexity. Use 'macromolecule' when referring to extremely large and often biologically significant molecules, and 'molecule' for any chemically bonded group of atoms, regardless of size.
In summary, while 'molecule' was mistakenly identified as a verb, its correct usage as a noun is crucial for understanding chemistry. It represents a specific type of particle, distinct from a single atom, and is the fundamental unit of compounds and some elements. The related terms like 'atom', 'compound', 'particle', 'ion', and 'macromolecule' each offer a different perspective or level of detail in describing matter, and choosing the right word depends on the specific chemical or physical property being emphasized.
按水平分级的例句
Scientists endeavored to synthesize novel pharmaceuticals by precisely manipulating the molecular structure of compounds, aiming for enhanced efficacy and reduced side effects.
Scientists worked to create new medicines by carefully changing the molecule structure of different substances, hoping to make them work better and have fewer bad effects.
This sentence uses advanced vocabulary and complex sentence structure, characteristic of C2 level English. 'Endeavored to synthesize' and 'precisely manipulating' demonstrate sophisticated verb choices.
The intricate dance of molecules within a living cell orchestrates all biological processes, from energy production to genetic replication, showcasing nature's profound complexity.
The complex movement of molecules inside a living cell controls all life processes, like making energy and copying genes, showing how incredibly complex nature is.
Figurative language ('intricate dance,' 'orchestrates') and abstract concepts like 'biological processes' and 'genetic replication' contribute to the C2 complexity.
Understanding the fundamental principles governing molecular interactions is paramount for advancements in materials science, enabling the creation of innovative, high-performance composites.
Understanding the basic rules that control how molecules interact is super important for progress in materials science, allowing us to make new, very effective materials.
Vocabulary such as 'paramount,' 'advancements,' 'governing,' and 'innovative, high-performance composites' are indicative of C2 level discourse.
Through spectroscopic analysis, researchers were able to elucidate the precise molecular arrangement of the newly discovered organic compound, a crucial step in its characterization.
By using a special light analysis, researchers could clearly show the exact way the molecules were arranged in the new organic substance, which was a very important step to describe it.
Specialized scientific vocabulary ('spectroscopic analysis,' 'elucidate,' 'molecular arrangement,' 'characterization') is typical of C2 academic writing.
The profound impact of environmental pollutants on ecosystems often stems from their ability to disrupt essential molecular pathways within organisms, leading to long-term health consequences.
The big effect of pollution on nature often comes from its ability to mess up important molecule pathways inside living things, causing health problems that last a long time.
Phrases like 'profound impact,' 'stems from,' 'disrupt essential molecular pathways,' and 'long-term health consequences' represent C2 linguistic sophistication.
Contemporary biochemical engineering leverages a deep understanding of molecular biology to design enzymes with tailored specificities, facilitating more efficient industrial processes.
Modern biochemical engineering uses a strong understanding of how molecules work in biology to create enzymes with specific jobs, making industrial processes more effective.
The sentence employs advanced technical vocabulary ('contemporary biochemical engineering,' 'leverages,' 'tailored specificities,' 'facilitating') and a complex sentence structure.
The quantum mechanical description of molecular orbitals provides an elegant framework for predicting chemical reactivity, offering insights that purely classical models cannot.
The quantum mechanics way of describing how molecules move gives a smart way to guess how chemicals will react, showing things that older, simpler models can't.
This sentence delves into abstract scientific concepts ('quantum mechanical description,' 'molecular orbitals,' 'elegant framework,' 'predicting chemical reactivity') with C2 vocabulary.
Pioneering work in nanotechnology focuses on constructing materials from the ground up, assembling individual molecules with atomic precision to achieve unprecedented functionalities.
New important work in nanotechnology is about building materials from scratch, putting together single molecules with exact precision to get totally new abilities.
The use of 'pioneering work,' 'from the ground up,' 'atomic precision,' and 'unprecedented functionalities' signifies C2 level vocabulary and thematic complexity.
小贴士
Understand the Etymology
Knowing the origin of 'molecule' (from French 'molécule' meaning 'small mass') can help you remember its core meaning. Breaking down words can aid memory.
Visualize the Concept
Picture two or more atoms connected to form a molecule. Visual aids are powerful for learning scientific terms.
Use in a Sentence
Create your own sentences using 'molecule'. For example: 'Water is composed of H₂O molecules.' Active recall strengthens understanding.
Relate to Familiar Concepts
Think of everyday substances like water (H₂O) or oxygen (O₂) as examples of molecules. Connecting new information to existing knowledge is effective.
Practice Pronunciation
Say 'molecule' aloud several times. Pay attention to the stressed syllable: 'MOL-uh-kyool'. Correct pronunciation helps with recognition and recall.
Identify Synonyms/Antonyms (where applicable)
While 'molecule' doesn't have direct synonyms, understanding its relation to 'atom' (a smaller, fundamental unit) can be helpful. Understanding related terms enriches vocabulary.
Flashcards for Quick Review
Create a flashcard with 'molecule' on one side and its definition on the other. Flashcards are great for spaced repetition.
Listen for the Word
Try to spot 'molecule' in scientific documentaries, news articles, or academic texts. Exposure to the word in context reinforces learning.
Teach Someone Else
Explain the concept of a molecule to a friend or family member. Teaching solidifies your own understanding.
Don't Confuse with 'Atom'
Remember that a molecule is made up of two or more atoms. An atom is the basic unit of matter. Distinguishing between similar terms is crucial for accuracy.
常见问题
10 个问题An atom is the basic unit of matter, and a molecule is formed when two or more atoms bond together. Think of it like this: an atom is a single Lego brick, and a molecule is two or more Lego bricks connected.
No, not always! Some molecules are made of the same type of atoms, like an oxygen molecule (O2), which has two oxygen atoms. Others are made of different types of atoms, like a water molecule (H2O), which has two hydrogen atoms and one oxygen atom.
Yes, molecules can be broken apart and rearranged during chemical reactions. This is how new substances are formed!
Atoms are held together in a molecule by forces called chemical bonds. These bonds are like invisible glue that keeps the atoms connected.
Most substances we encounter daily are made of molecules, but some, like metals, are structured differently. However, for many common things, yes, they're made of these tiny units.
No, molecules are far too small to be seen with the naked eye or even with a regular microscope. You'd need specialized equipment like an electron microscope to observe them indirectly.
Molecules are incredibly tiny! They are measured in nanometers, which are billionths of a meter. So, they're much, much smaller than anything you can usually see.
Yes, absolutely! Water (H2O) is a classic example of a molecule, made up of two hydrogen atoms and one oxygen atom bonded together.
Yes, molecules are constantly in motion! Even in solids, they vibrate. In liquids and gases, they move around much more freely, which is why liquids flow and gases spread out.
Understanding molecules is fundamental to understanding chemistry and how the world around us works. It helps explain everything from how our bodies function to how materials behave and how medicines are developed.
自我测试 162 个问题
Water is a ___.
A molecule is a small unit of a substance. Water is made of small units, so it is a molecule.
A water ___ has hydrogen and oxygen.
A water molecule is made of two different parts, hydrogen and oxygen.
Sugar is a sweet ___.
Sugar is a substance that is made of small units, which are molecules.
Small parts of things are called ___.
Molecules are very small parts that make up substances.
This air has many oxygen ___.
Oxygen is a gas, and it is made of small parts called molecules.
A carbon dioxide ___ is in the air.
Carbon dioxide is a gas, and it exists as small units called molecules.
Which of these is a tiny part of a substance?
A molecule is a very small part of something.
What is a molecule made of?
Molecules are made from small pieces called atoms.
Can a molecule live alone?
A molecule can exist independently, meaning it can be by itself.
A molecule is a very big thing.
A molecule is the smallest unit of a chemical substance, so it is very small.
Two small atoms can make a molecule.
A molecule consists of two or more atoms.
A molecule loses its properties when it is by itself.
A molecule retains its chemical properties when it exists independently.
Think about common substances.
What is inside a molecule?
What gas do we need to live?
Read this aloud:
Molecule.
Focus: /ˈmɒlɪkjuːl/
你说的：
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Read this aloud:
This is a molecule.
Focus: molecule
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Read this aloud:
Water is a molecule.
Focus: Water is
你说的：
Speech recognition is not supported in your browser. Try Chrome or Edge.
Write a short sentence using the word 'molecule'.
Well written! Good try! Check the sample answer below.
Sample answer
Water is a molecule.
Complete the sentence: A tiny part of water is a ______.
Well written! Good try! Check the sample answer below.
Sample answer
A tiny part of water is a molecule.
Describe in one simple sentence what a molecule is, using your own words.
Well written! Good try! Check the sample answer below.
Sample answer
A molecule is a very small part of something.
What is water made of?
Read this passage:
Water is all around us. It is made of very tiny parts. Each tiny part of water is called a molecule. You cannot see a molecule with your eyes.
What is water made of?
The passage says, 'It is made of very tiny parts.'
The passage says, 'It is made of very tiny parts.'
What is a molecule like?
Read this passage:
A molecule is like a small building block. Many molecules together make bigger things. For example, many water molecules make a drop of water.
What is a molecule like?
The passage states, 'A molecule is like a small building block.'
The passage states, 'A molecule is like a small building block.'
Can you see a single water molecule with your eyes?
Read this passage:
You can drink water, but you cannot see a single water molecule. They are too small. You need special tools to see them.
Can you see a single water molecule with your eyes?
The passage says, 'You cannot see a single water molecule. They are too small.'
The passage says, 'You cannot see a single water molecule. They are too small.'
This sentence introduces the concept that a molecule is small.
This sentence explains what a molecule is made of.
This sentence describes how molecules are formed.
Water is a simple ___ of hydrogen and oxygen.
A molecule is formed when atoms join together.
A single drop of water has many water ___ in it.
Many molecules make up a drop of water.
Scientists study how different ___ react with each other.
Molecules are the tiny parts that make up substances and react together.
Oxygen is a gas made of tiny oxygen ___.
Gases are made of very small particles called molecules.
The air we breathe is a mix of many different types of ___.
Air is a mixture of gases, and gases are made of molecules.
Sugar is made of carbon, hydrogen, and oxygen ___ joined together.
These elements combine to form sugar molecules.
Which of these is a small part of a substance?
A molecule is the smallest unit of a chemical substance.
What is a molecule made of?
A molecule consists of two or more atoms held together.
Can a molecule exist by itself?
A molecule can exist independently while retaining its chemical properties.
A molecule is a very big part of a chemical substance.
A molecule is the smallest unit of a chemical substance.
Molecules are made of things called atoms.
A molecule consists of two or more atoms held together.
A single atom can be called a molecule.
A molecule consists of two or more atoms, not just one.
Imagine you are explaining what water is made of to a young child. Use simple words to describe its basic parts. Try to use the word 'molecule' in your explanation.
Well written! Good try! Check the sample answer below.
Sample answer
Water is made of very, very tiny pieces. We call one of these tiny pieces a molecule of water. It's so small you can't see it!
Complete the sentence: 'Everything around us, like a chair or a book, is made of tiny _________.'
Well written! Good try! Check the sample answer below.
Sample answer
Everything around us, like a chair or a book, is made of tiny molecules.
Describe a simple object you see every day, like a pencil or a cup, and mention that it's made of many small 'molecules'.
Well written! Good try! Check the sample answer below.
Sample answer
I have a cup on my desk. It feels solid, but it's actually made of a lot of tiny molecules all together.
What is air made of?
Read this passage:
Air is all around us, but we can't see it. Air is made of very small parts. These small parts are called molecules. There are many different kinds of molecules in the air we breathe.
What is air made of?
The passage states, 'Air is made of very small parts. These small parts are called molecules.'
The passage states, 'Air is made of very small parts. These small parts are called molecules.'
Can you see molecules in milk with your eyes?
Read this passage:
A glass of milk might look like one thing, but it's actually made of many, many tiny pieces. These pieces are so small that you need a special machine to see them. Each tiny piece is a molecule. Milk has different kinds of molecules in it.
Can you see molecules in milk with your eyes?
The passage says, 'These pieces are so small that you need a special machine to see them.'
The passage says, 'These pieces are so small that you need a special machine to see them.'
What happens to the molecules when water turns into steam?
Read this passage:
When you boil water, it changes into steam. Both water and steam are made of the same kind of molecule. The molecules just move differently when the water gets hot and turns into steam.
What happens to the molecules when water turns into steam?
The passage states, 'The molecules just move differently when the water gets hot and turns into steam.'
The passage states, 'The molecules just move differently when the water gets hot and turns into steam.'
This sentence describes the basic composition of a water molecule.
This sentence explains what plants need to grow.
This sentence describes the omnipresence of molecules.
A water ___ is made up of two hydrogen atoms and one oxygen atom.
A molecule is the smallest unit of a chemical substance that can exist independently.
The air we breathe contains many oxygen ___, which are essential for life.
Oxygen molecules are the smallest units of oxygen gas.
Scientists study how different ___ interact to form new substances.
Molecules interact in chemical reactions.
When you boil water, the ___ move faster and eventually turn into steam.
The molecules of water move faster when heated.
Each sugar ___ is made of carbon, hydrogen, and oxygen atoms.
A sugar molecule is the smallest unit of sugar.
The smell of flowers comes from tiny ___ that travel through the air.
Scent is carried by odor molecules.
Which of these is the smallest unit of a chemical substance that can exist independently?
A molecule is defined as the smallest unit of a chemical substance that can exist independently while retaining its chemical properties.
What holds atoms together in a molecule?
The definition states that a molecule consists of two or more atoms held together by chemical bonds.
How many atoms does a molecule usually have?
A molecule consists of two or more atoms held together by chemical bonds.
A molecule can exist independently.
The definition states that a molecule can exist independently while retaining its chemical properties.
Molecules are made of only one atom.
Molecules consist of two or more atoms held together by chemical bonds.
A molecule loses its chemical properties when it is formed.
A molecule retains its chemical properties when it exists independently.
Think about common chemical compounds.
Consider what makes up living organisms.
Focus on how chemical substances behave.
Read this aloud:
Can you explain what a molecule is in your own words?
Focus: molecule
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Read this aloud:
Give an example of a common molecule and what it's made of.
Focus: example, common
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How do molecules relate to the properties of a substance?
Focus: relate, properties
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Imagine you are explaining what a 'molecule' is to a friend who has never heard the word before. Write a short explanation, using simple language.
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Sample answer
A molecule is like a tiny building block of everything around us. It's the smallest part of something that still keeps all its special qualities. Think of it like two or more super tiny particles, called atoms, holding hands to make something new.
Write a sentence describing an everyday substance, like water or oxygen, and mention that it is made of molecules.
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Sample answer
Water is a common liquid that we drink every day, and it is made up of many tiny water molecules.
Complete the sentence: 'When atoms join together, they form a ______.' Then, write one more sentence about what this new thing can do.
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Sample answer
When atoms join together, they form a molecule. This molecule can then have its own unique chemical properties.
What is a molecule?
Read this passage:
A molecule is a very small particle. It is the basic unit of a chemical substance. For example, a water molecule is made of two hydrogen atoms and one oxygen atom. These tiny molecules are what give water its properties, like being a liquid at room temperature.
What is a molecule?
The passage states that 'A molecule is the basic unit of a chemical substance.'
The passage states that 'A molecule is the basic unit of a chemical substance.'
Why do scientists study molecules?
Read this passage:
Scientists study molecules to understand how different substances behave. They look at how atoms connect to form different types of molecules. This helps them create new materials and medicines. Understanding molecules is very important in chemistry.
Why do scientists study molecules?
The passage says, 'Scientists study molecules to understand how different substances behave. They look at how atoms connect to form different types of molecules. This helps them create new materials and medicines.'
The passage says, 'Scientists study molecules to understand how different substances behave. They look at how atoms connect to form different types of molecules. This helps them create new materials and medicines.'
How many oxygen atoms are in one carbon dioxide molecule?
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Oxygen is a gas that we breathe. Each molecule of oxygen is made of two oxygen atoms joined together. Carbon dioxide is another gas, and its molecules are made of one carbon atom and two oxygen atoms. These small differences in how atoms connect make a big difference in what the gas is like.
How many oxygen atoms are in one carbon dioxide molecule?
The passage states, 'Carbon dioxide is another gas, and its molecules are made of one carbon atom and two oxygen atoms.'
The passage states, 'Carbon dioxide is another gas, and its molecules are made of one carbon atom and two oxygen atoms.'
This sentence describes the composition of a water molecule.
This sentence emphasizes the microscopic nature of molecules.
This sentence explains that the type of molecule determines the substance.
Which of the following best describes a molecule?
The definition states that a molecule is 'the smallest unit of a chemical substance that can exist independently while retaining its chemical properties.'
What holds atoms together within a molecule?
The definition explicitly states that a molecule 'consists of two or more atoms held together by chemical bonds.'
Can a molecule exist independently?
The definition mentions that a molecule 'can exist independently' while maintaining its chemical properties.
A molecule is typically made up of only one atom.
The definition states that a molecule 'consists of two or more atoms held together by chemical bonds,' indicating it's not typically a single atom.
When atoms form a molecule, they lose their individual chemical properties.
The definition states that a molecule 'retaining its chemical properties' even when it's part of a larger substance.
All chemical substances are composed of molecules.
While many substances are made of molecules, some, like ionic compounds (e.g., salt), form crystal lattices and don't exist as discrete molecules.
Think about the building blocks of water.
Consider the importance of molecular interaction in a scientific field.
Focus on the impact of structural changes at the molecular level.
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Could you explain what a molecule is in your own words, and give an example?
Focus: ex-PLAIN, MOL-e-cule, ex-AM-ple
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How do molecules relate to the physical world around us?
Focus: re-LATE, PHYS-i-cal, a-ROUND
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Imagine you're explaining the concept of a molecule to a child. What simple analogy would you use?
Focus: i-MAG-ine, ex-PLAIN-ing, CON-cept, a-NAL-o-gy
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Explain in your own words what a 'molecule' is, and provide an example of a common molecule you might encounter every day.
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Sample answer
A molecule is the smallest particle of a substance that can exist independently while still having all the properties of that substance. It's made up of two or more atoms linked together by chemical bonds. A very common example is a water molecule, which consists of two hydrogen atoms and one oxygen atom (H2O).
Imagine you are explaining the concept of a 'molecule' to a younger sibling. Write a short, simple explanation that they would understand.
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Sample answer
Hey! So, imagine everything around us, like water, air, and even us, is made of super tiny building blocks. A molecule is like a small group of these building blocks that are stuck together. They're so small you can't see them, but they make up everything!
Describe the relationship between atoms and molecules. How are they similar, and how are they different?
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Sample answer
Atoms are the fundamental building blocks of all matter. Molecules, on the other hand, are formed when two or more atoms bond together. So, atoms are like individual Lego bricks, while molecules are like small structures built from those bricks. Atoms are smaller and more basic, and molecules are essentially collections of atoms that can exist independently.
What is the chemical composition of a water molecule?
Read this passage:
Water, essential for life, is a classic example of a molecule. Each water molecule is composed of two hydrogen atoms and one oxygen atom, famously represented as H2O. These atoms are held together by strong chemical bonds, allowing water to maintain its unique properties, such as its ability to dissolve many substances and its high boiling point.
What is the chemical composition of a water molecule?
The passage clearly states that a water molecule is composed of two hydrogen atoms and one oxygen atom (H2O).
The passage clearly states that a water molecule is composed of two hydrogen atoms and one oxygen atom (H2O).
According to the passage, what is the primary component of an oxygen gas molecule?
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The air we breathe is a mixture of various gases, and each gas is made up of different types of molecules. For instance, oxygen gas consists of oxygen molecules, which are made of two oxygen atoms bonded together. Similarly, nitrogen gas is composed of nitrogen molecules, each with two nitrogen atoms.
According to the passage, what is the primary component of an oxygen gas molecule?
The passage states, 'oxygen gas consists of oxygen molecules, which are made of two oxygen atoms bonded together.'
The passage states, 'oxygen gas consists of oxygen molecules, which are made of two oxygen atoms bonded together.'
Why is the study of molecules important in various scientific fields?
Read this passage:
Scientists often study molecules to understand the fundamental nature of materials and how they interact. This field, known as molecular science, is crucial in developing new medicines, advanced materials, and understanding biological processes. The arrangement and types of atoms within a molecule determine its behavior and function.
Why is the study of molecules important in various scientific fields?
The passage highlights that molecular science is 'crucial in developing new medicines, advanced materials, and understanding biological processes.'
The passage highlights that molecular science is 'crucial in developing new medicines, advanced materials, and understanding biological processes.'
This sentence defines a key characteristic of a molecule.
This phrase describes how a molecule behaves.
This sentence starts the definition of a molecule.
The complex organic ___ in living organisms are fundamental to biological processes.
The definition of molecule provided (smallest unit of a chemical substance that can exist independently) fits the context of complex organic units in living organisms.
Understanding how different ___ interact is crucial for advancements in pharmacology.
Pharmacology often deals with the interaction of chemical substances at a molecular level to produce therapeutic effects.
A single water ___ consists of two hydrogen atoms bonded to one oxygen atom.
The description perfectly matches the definition of a water molecule, which is the smallest independent unit of water.
Scientists are working to engineer novel ___ with specific properties for industrial applications.
Engineering novel substances often involves designing and synthesizing new molecules with desired characteristics.
The study of how light interacts with individual ___ provides insights into quantum mechanics.
Quantum mechanics often examines interactions at the atomic and molecular level, including how light energy affects molecules.
Researchers observed the formation of new ___ when the two chemical compounds were mixed under specific conditions.
When chemical compounds are mixed, they can react to form entirely new molecules, reflecting a change in their chemical properties.
Which of the following best describes the fundamental characteristic of a molecule?
The definition explicitly states that a molecule is the smallest unit of a chemical substance that can exist independently while retaining its chemical properties.
What is the primary way atoms are held together within a molecule?
The definition clearly states that a molecule consists of two or more atoms held together by chemical bonds.
If a substance is broken down to its individual atoms, it no longer maintains its original chemical properties. This is because:
The definition emphasizes that a molecule retains the chemical properties of the substance. Breaking it down past the molecular level means these properties are no longer present.
A single atom can be considered a molecule.
The definition states that a molecule consists of two or more atoms held together by chemical bonds.
All molecules are visible to the naked eye.
Molecules are microscopic and cannot be seen without specialized equipment.
The chemical properties of a substance are fundamentally determined by the structure and composition of its molecules.
The definition implies that the molecule is the smallest unit to retain chemical properties, meaning its structure and composition dictate those properties.
Consider the impact of atomic arrangement on molecular behavior.
Think about the practical applications of molecular understanding.
Reflect on the diversity and complexity of molecular structures.
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The groundbreaking discovery of DNA's double helix structure revolutionized our comprehension of genetics and heredity.
Focus: revolutionary comprehension heredity
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Chemists often employ sophisticated spectroscopic techniques to elucidate the exact atomic composition and spatial geometry of novel molecules.
Focus: sophisticated spectroscopic elucidate spatial geometry
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The inherent stability of a molecule is directly correlated with the strength and nature of the chemical bonds holding its constituent atoms together.
Focus: inherent stability correlated constituent
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Explain the significance of molecular structure in determining the properties of a substance. Provide a complex example to illustrate your point.
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Sample answer
The intricate arrangement of atoms within a molecule, known as its molecular structure, fundamentally dictates the macroscopic properties of a substance. For instance, consider the stark contrast between graphite and diamond, both allotropes of carbon. Graphite, with its planar, hexagonal layers of carbon atoms weakly bonded between layers, exhibits excellent lubricity and electrical conductivity. Conversely, diamond's tetrahedral network of strongly covalent-bonded carbon atoms results in exceptional hardness and electrical insulation. This profound difference in physical characteristics arises solely from the disparate molecular architectures, showcasing the critical role of molecular structure in material science.
Discuss the challenges and advancements in synthesizing complex organic molecules in laboratories, highlighting the implications for pharmaceutical development.
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Sample answer
Synthesizing complex organic molecules in a laboratory setting presents formidable challenges, primarily due to the need for precise control over stereochemistry and the formation of multiple reactive sites. Early synthetic routes often yielded racemic mixtures, complicating drug development where specific enantiomers are crucial for therapeutic efficacy. However, significant advancements, particularly in asymmetric catalysis and retrosynthetic analysis, have revolutionized the field. These innovations allow chemists to construct intricate molecular architectures with high fidelity, directly impacting pharmaceutical development by enabling the production of highly selective and potent drugs with reduced side effects. This precision in molecular engineering is vital for addressing complex diseases.
Analyze how the concept of a 'molecule' has evolved with the development of quantum mechanics and its impact on our understanding of chemical bonding.
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Sample answer
The concept of a 'molecule' has undergone a profound transformation with the advent of quantum mechanics. Initially viewed as discrete entities held by simple forces, quantum mechanics provided a sophisticated framework to understand chemical bonding through the behavior of electrons. The Schrödinger equation, for instance, elucidated how electron wave functions overlap to form molecular orbitals, explaining the stability and geometry of molecules far beyond classical models. This quantum mechanical perspective allowed for the precise prediction of bond lengths, angles, and energies, fundamentally deepening our comprehension of why atoms bond and how molecular structure dictates chemical reactivity. It shifted the understanding from a static, particulate view to a dynamic, probabilistic model of electron distribution.
What is highlighted as crucial for advancements in nanotechnology?
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In the burgeoning field of nanotechnology, the ability to manipulate individual molecules is paramount. Researchers are now capable of constructing devices at an atomic scale, leveraging the unique properties that emerge at such dimensions. This unprecedented control over molecular architecture promises revolutionary breakthroughs in medicine, materials science, and computing, albeit with significant engineering hurdles to overcome.
What is highlighted as crucial for advancements in nanotechnology?
The passage explicitly states, 'the ability to manipulate individual molecules is paramount' in nanotechnology, indicating its crucial role.
The passage explicitly states, 'the ability to manipulate individual molecules is paramount' in nanotechnology, indicating its crucial role.
What is the primary factor mentioned that gives CO2 and CH4 their significant climate impact?
Read this passage:
The Earth's atmosphere is a complex mixture of various gases, with nitrogen (N2) and oxygen (O2) molecules being the most abundant. These diatomic molecules are essential for life, participating in critical biological and geological cycles. However, the presence of trace amounts of other molecules, such as carbon dioxide (CO2) and methane (CH4), despite their low concentration, exerts a disproportionately significant influence on global climate patterns.
What is the primary factor mentioned that gives CO2 and CH4 their significant climate impact?
The passage states that CO2 and CH4 'exerts a disproportionately significant influence on global climate patterns' even with 'trace amounts' and 'low concentration'.
The passage states that CO2 and CH4 'exerts a disproportionately significant influence on global climate patterns' even with 'trace amounts' and 'low concentration'.
According to the passage, what is the consequence of protein mis-folding?
Read this passage:
Protein folding, a fundamental biological process, involves a polypeptide chain acquiring its characteristic three-dimensional structure, which is crucial for its function. Mis-folding of these complex molecules can lead to a range of debilitating diseases, including Alzheimer's and Parkinson's. Understanding the intricate molecular mechanisms governing protein folding remains a significant challenge, despite decades of research.
According to the passage, what is the consequence of protein mis-folding?
The passage explicitly states that 'Mis-folding of these complex molecules can lead to a range of debilitating diseases, including Alzheimer's and Parkinson's'.
The passage explicitly states that 'Mis-folding of these complex molecules can lead to a range of debilitating diseases, including Alzheimer's and Parkinson's'.
This sentence defines what a molecule is in the context of chemical substances.
This sentence describes how atoms within a molecule are connected.
This sentence emphasizes the importance of studying molecules in various scientific fields.
The complex organic ___ in living organisms are fundamental to biological processes.
The term 'molecules' precisely refers to the smallest units of a chemical substance that retain their chemical properties, fitting the context of complex organic structures in living organisms.
Scientists are working to engineer novel ___ with tailored properties for advanced material applications.
'Molecules' is the most accurate term here, as the sentence describes the creation of new chemical entities with specific properties, which aligns with the definition of molecules.
Understanding how individual ___ interact is crucial for deciphering the mechanisms of drug action.
In the context of drug action, it's the specific interaction of chemical 'molecules' with biological targets that dictates their effects.
The quantum mechanical description of ___ provides insights into their electronic structure and reactivity.
Quantum mechanics is often applied to study the behavior and properties of individual 'molecules', including their electronic structure and how they react.
Through meticulous synthesis, chemists can construct intricate ___ with precise three-dimensional arrangements.
The construction of 'intricate' structures with 'precise three-dimensional arrangements' is a hallmark of molecular synthesis in chemistry.
The absorption and emission of light by ___ form the basis of various spectroscopic techniques.
Spectroscopic techniques frequently rely on the unique ways in which 'molecules' interact with light, leading to characteristic absorption and emission patterns.
Which of the following best describes the process by which a molecule forms?
Molecules are formed through chemical bonding, which involves the sharing or exchange of electrons between atoms, leading to a stable configuration.
In the context of complex organic chemistry, what is the significance of understanding molecular structure?
Molecular structure profoundly influences a compound's properties, including its chemical reactivity, biological function, and how it interacts with other molecules, which is vital in organic chemistry.
Which statement accurately differentiates a molecule from an atom?
An atom is the fundamental building block of matter and the smallest unit of an element, whereas a molecule is a group of two or more atoms held together by chemical bonds, representing the smallest unit of a substance that can exist independently and maintain its characteristic properties.
A single atom of oxygen (O) can be considered a molecule.
While a single atom can exist, the definition of a molecule typically requires two or more atoms bonded together. Oxygen in its stable molecular form is O2 (diatomic oxygen).
The chemical properties of a molecule are solely determined by the types of atoms it contains, irrespective of their arrangement.
The chemical properties of a molecule are determined not only by the types of atoms present but also critically by their spatial arrangement and the specific chemical bonds formed between them. This is known as molecular structure, which dictates reactivity and function.
Covalent bonds are the only type of chemical bond that can form a molecule.
While covalent bonds are very common in molecule formation, ionic bonds can also lead to the formation of molecular compounds (though the term 'molecule' is often used more strictly for covalently bonded entities). Additionally, metallic bonds in metals and hydrogen bonds in certain contexts play roles in molecular interactions, even if not directly forming discrete 'molecules' in the same sense.
Focus on the relationship between atomic arrangement and molecular behavior.
Consider the importance of molecular geometry.
Think about the diversity and significance of molecules.
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Elucidate the critical role that intermolecular forces play in determining a substance's physical state and thermodynamic properties.
Focus: elucidate, intermolecular, thermodynamic
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Discuss the implications of chirality in pharmaceutical design, particularly concerning enantiomeric purity and its impact on drug efficacy and safety.
Focus: chirality, pharmaceutical, enantiomeric, efficacy
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Analyze how advancements in spectroscopic techniques have revolutionized our ability to discern the intricate molecular structures of complex organic compounds.
Focus: spectroscopic, revolutionized, discern, intricate
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This sentence describes the presence of complex organic molecules in space.
This sentence explains a key characteristic of a catalyst in a chemical reaction.
This sentence describes the precise action of some drug molecules.
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Summary
Molecules are the fundamental building blocks of chemical substances, defining their unique properties.
- A molecule is the smallest unit of a chemical substance that can exist independently.
- It retains its chemical properties and is made up of two or more atoms.
- These atoms are held together by chemical bonds.
Understand the Etymology
Knowing the origin of 'molecule' (from French 'molécule' meaning 'small mass') can help you remember its core meaning. Breaking down words can aid memory.
Visualize the Concept
Picture two or more atoms connected to form a molecule. Visual aids are powerful for learning scientific terms.
Use in a Sentence
Create your own sentences using 'molecule'. For example: 'Water is composed of H₂O molecules.' Active recall strengthens understanding.
Relate to Familiar Concepts
Think of everyday substances like water (H₂O) or oxygen (O₂) as examples of molecules. Connecting new information to existing knowledge is effective.
例句
A single water molecule consists of two hydrogen atoms and one oxygen atom.
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abbioly
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abcapal
C1在实验室环境中用于隔离敏感化学或生物样品的特殊保护膜或密封剂。它起到高精度屏障的作用，防止大气污染。
abheredcy
C1To deviate or drift away from a prescribed standard, rule, or physical path, particularly while ostensibly trying to maintain a connection to it. It describes the act of subtle or unintentional departure from a strict protocol or alignment.
abhydrible
C1指那些化学上抗水，且一旦脱水后无法重新水合的物质。
ablabive
C1ablabive 指的是通过熔化、蒸发或手术切除等方式去除物质。
abphobency
C1The characteristic or property of a surface or material that causes it to repel or resist substances like water, oil, or contaminants. It describes the physical state of being repellent rather than absorbent, often used in technical discussions about coatings.
abphotoion
C1To remove or displace an ion from a molecular structure using concentrated light energy or radiation. It is a specialized term used in advanced physics and chemical engineering to describe the precise detachment of particles via photon interaction.
abpulssion
C1The forceful driving away or outward thrust of a substance or object from a specific source. It is often used in technical or scientific contexts to describe the sudden rejection of a component or the mechanical discharge of energy.
absorption
B2指液体被吸入，也指一个人全神贯注于某事，以至于忽略了周围的一切。
abvincfy
C1To systematically isolate or decouple a specific component or variable from a larger, complex system in order to study it independently. This term is often used in experimental design or technical analysis to describe the process of removing confounding influences.
