Chemistry is the fundamental study of how substances are composed and how they transform through reactions.
Word in 30 Seconds
- The scientific study of matter and its changes.
- A mandatory subject in high school science curricula.
- Used to describe chemical properties or synthetic substances.
概要
化学（かがく）は、私たちの身の回りにある物質がどのような成分でできているのか、また物質同士が混ざったり熱を加えたりしたときにどのような変化が起こるのかを解明する学問です。物理学や生物学と並ぶ自然科学の主要な柱の一つです。
使用パターン
学校の授業科目として「化学」という言葉が最も頻繁に使われます。また、特定の物質が持つ性質を指して「化学的な性質」と表現したり、人と人との相性を比喩的に「化学反応」と呼んだりすることもあります。
類似語との比較
「科学（かがく）」はサイエンス全般を指す広い概念ですが、「化学（かがく）」は物質の変化に特化した特定の学問を指します。読み方が同じであるため、文脈で区別する必要があります。また、「物理」は物質の性質や運動を扱うのに対し、「化学」は物質の組成や反応そのものに焦点を当てます。
Examples
高校で化学の授業が好きだった。
everydayI liked chemistry class in high school.
この物質は化学的に安定している。
formalThis substance is chemically stable.
彼と私は化学反応が起きたみたいだ。
informalIt seems like there was some chemistry between us.
化学工学の分野で研究を続けている。
academicI am continuing my research in the field of chemical engineering.
Common Collocations
Common Phrases
化学変化
Chemical change
化学式
Chemical formula
Often Confused With
This is a broader term meaning 'science' in general, including physics, biology, and astronomy. Use 'kagaku' for the general field and 'kagaku' (chemistry) only when referring to matter and reactions.
Grammar Patterns
How to Use It
Usage Notes
The word is neutral and used in both academic and casual settings. When speaking, context usually clarifies if you mean 'science' or 'chemistry'. In technical writing, it is often paired with specific fields like 'organic chemistry'.
Common Mistakes
Learners often confuse the kanji for 'science' and 'chemistry' because they have the same pronunciation. Remember that '化学' has the character for 'change' (化), which relates to how substances change.
Tips
Use context to distinguish homophones
Since 'kagaku' can mean both science and chemistry, look for surrounding words like 'experiment' (jikken) or 'substance' (busshitsu) to identify the meaning.
Do not confuse with 'Physics'
Remember that 'butsuri' (physics) focuses on energy and motion, while 'kagaku' (chemistry) focuses on substance composition and transformation.
Chemical education in Japan
In Japan, chemistry is a standard, rigorous subject in high school, and students often choose between 'Chemistry' and 'Physics' for university entrance exams.
Word Origin
The word is composed of '化' (change) and '学' (study). It was introduced as a translation for the Western concept of 'chemistry' during the Meiji era.
Cultural Context
Chemistry is highly valued in Japan's industrial sector, leading to many Nobel Prizes in this field. It is a core component of the Japanese education system.
Memory Tip
Think of the '化' in '化学' as 'change'. Chemistry is the study of how things 'change' into other things.
Frequently Asked Questions
4 questions「科学」はサイエンス全般を指す広義の言葉です。一方、「化学」は物質の構造や変化を研究する特定の分野を指します。
人によりますが、目に見えない原子や分子を扱うため、概念の理解に抽象的な思考が必要です。実験を通じて学ぶと理解が深まりやすいです。
医薬品の開発、新素材の作成、環境問題の解決など、現代社会の技術基盤を理解するのに不可欠です。日常生活でも食品や洗剤の成分表示を理解するのに役立ちます。
基本的には「かがく」と読みます。科学と区別するために、「ばけがく」と呼ぶこともありますが、これは学術的にはあまり一般的ではありません。
Test Yourself
大学で___を専攻して、新薬の開発を目指したい。
新薬の開発は物質の反応を扱うため、化学が最も適切です。
Score: /1
Summary
Chemistry is the fundamental study of how substances are composed and how they transform through reactions.
- The scientific study of matter and its changes.
- A mandatory subject in high school science curricula.
- Used to describe chemical properties or synthetic substances.
Use context to distinguish homophones
Since 'kagaku' can mean both science and chemistry, look for surrounding words like 'experiment' (jikken) or 'substance' (busshitsu) to identify the meaning.
Do not confuse with 'Physics'
Remember that 'butsuri' (physics) focuses on energy and motion, while 'kagaku' (chemistry) focuses on substance composition and transformation.
Chemical education in Japan
In Japan, chemistry is a standard, rigorous subject in high school, and students often choose between 'Chemistry' and 'Physics' for university entrance exams.
Examples
4 of 4高校で化学の授業が好きだった。
I liked chemistry class in high school.
この物質は化学的に安定している。
This substance is chemically stable.
彼と私は化学反応が起きたみたいだ。
It seems like there was some chemistry between us.
化学工学の分野で研究を続けている。
I am continuing my research in the field of chemical engineering.
Related Content
This Word in Other Languages
Related Vocabulary
More academic words
絶対的
B2Absolute; not qualified or diminished in any way; total.
絶対的に
B1In a complete, unconditional, or conclusive manner; absolutely.
抽象的だ
B1Abstract; existing in thought or as an idea but not having a physical or concrete existence.
抽象
B2Existing in thought or as an idea but not having a physical or concrete existence. It refers to generalizing or extracting the essence of something away from specific details.
抽象的に
B1In an abstract or theoretical manner.
学術的な
B1Academic, scholarly; relating to education and scholarship.
学術的だ
B1Academic; relating to education and scholarship.
学術的
B2Academic; relating to education and scholarship.
学術
B1Academia; scholarship; relating to scholarly pursuits.
学力
B1Academic ability; a person's level of knowledge and skill in academic subjects.
