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experimento

B1 noun #3,500 most common 7 min read

experimento

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Practice it Examples Notes & Tips experimento in 30 Seconds

Explanation experimento in your Level:

At the A1 level, you should recognize 'experimento' as a word that looks very similar to 'experiment' in English. It is a masculine noun (el experimento). You will mostly use it in very simple sentences about school or science. For example, 'El experimento es divertido' (The experiment is fun). At this stage, just focus on the spelling—remember the 'o' at the end—and the fact that it is a 'thing' you can do in a classroom. You don't need to know complex scientific terms yet, just that it involves trying something to see what happens. It is a 'cognate,' which means it is easy to remember because it is almost the same in English and Spanish.

At the A2 level, you can start using 'experimento' with basic verbs like 'hacer' (to do/make). You might say, 'Mañana vamos a hacer un experimento en la clase de química.' You should also be able to describe the experiment using simple adjectives like 'grande', 'pequeño', 'fácil', or 'difícil'. You are starting to understand that 'experimento' is used for science projects. You should also be careful not to confuse it with 'experiencia', which you might use to talk about your life travels. Remember: 'experimento' is for a test, 'experiencia' is for your life history.

As a B1 learner, you should use 'experimento' in more varied contexts. You can use it to talk about social experiments on the internet or a 'culinary experiment' in your kitchen. You should start using more professional verbs like 'realizar' instead of just 'hacer'. You can also use it in the plural and with prepositions, such as 'los resultados del experimento'. You are able to explain why an experiment was done: 'Hicimos el experimento para ver si el agua hervía más rápido con sal.' This level requires you to understand the word in news articles or basic scientific reports.

At the B2 level, you should be comfortable with 'experimento' in academic and professional settings. You will use terms like 'experimento controlado', 'experimento de campo', or 'experimento piloto'. You can discuss the ethics of experiments or their methodology. You should understand the difference between 'ensayo', 'prueba', and 'experimento' and choose the most precise word for the situation. You might say, 'El experimento arrojó resultados inesperados que contradicen la teoría inicial.' Your vocabulary should include related words like 'experimental' and the verb 'experimentar'.

At the C1 level, 'experimento' is a word you use with nuance. You can discuss 'experimentos mentales' (thought experiments) in philosophy or 'experimentos de vanguardia' in art. You understand the metaphorical use of the word in politics or economics, such as calling a new law a 'social experiment.' You can use complex sentence structures: 'Si bien el experimento carecía de un grupo de control sólido, sus hallazgos preliminares son dignos de mención.' You are also aware of historical and cultural references to famous experiments and can discuss them fluently in Spanish.

At the C2 level, you use 'experimento' with the precision of a native speaker or a professional researcher. You can navigate highly technical discussions where 'experimento' is differentiated from 'estudio observacional' or 'meta-análisis'. You can use the word in sophisticated rhetorical ways, perhaps critiquing a social policy as a 'peligroso experimento de ingeniería social.' Your mastery includes all idiomatic expressions and the ability to use the word across all registers, from highly academic journals to creative literature, with perfect grammatical and stylistic accuracy.

Practice it Examples Notes & Tips

experimento in 30 Seconds

A masculine noun meaning 'experiment'.
Used in scientific, social, and personal contexts.
Commonly paired with the verb 'realizar'.
A cognate that is easy for English speakers to recognize.

The Spanish word experimento is a masculine noun that translates directly to the English word "experiment." At its core, it refers to a procedure carried out to support, refute, or validate a hypothesis. However, in the rich tapestry of the Spanish language, its usage extends far beyond the sterile walls of a laboratory. It encompasses any trial, test, or tentative action taken to discover something unknown or to test a principle or supposition.

Scientific Context: In formal science, an experimento is the cornerstone of the empirical method. It involves controlled variables and measurable outcomes. When a chemist mixes two reagents, they are performing an experimento químico.
Social and Psychological Context: In sociology, an experimento social observes human behavior under specific conditions. This has become a popular term in digital media, referring to staged situations designed to provoke a reaction from the public.
Metaphorical and Personal Usage: Colloquially, Spanish speakers use the word when trying something new for the first time, like a new recipe or a different route to work. If you add chocolate to a savory dish, you might say it was a culinary experimento.

El científico diseñó un experimento para probar la eficacia de la nueva medicina.

The scientist designed an experiment to test the efficacy of the new medicine.

No estoy seguro de si esta receta funcionará; es solo un experimento.

I am not sure if this recipe will work; it is just an experiment.

The word carries a connotation of curiosity and risk. Whether it is a experimento fallido (failed experiment) or a experimento exitoso (successful experiment), the focus is always on the process of learning through action. In professional settings, you might hear about an experimento piloto, which is a small-scale trial run of a project. In artistic circles, an experimento formal refers to pushing the boundaries of a medium. This versatility makes the word indispensable for any B1 learner who wishes to discuss science, innovation, or personal growth.

Educational Context: In schools, students perform experimentos sencillos to understand basic physics or chemistry. It is the first step toward developing a critical and scientific mind.

Hicimos un experimento con plantas en la clase de biología.

Using experimento correctly requires pairing it with the right verbs and adjectives. The most common verb used with this noun is realizar (to perform/carry out), though hacer (to do/make) is perfectly acceptable in informal conversation. For more formal or academic contexts, llevar a cabo (to carry out) is the preferred expression.

Common Verbs: - Realizar un experimento (To perform an experiment)
- Diseñar un experimento (To design an experiment)
- Analizar un experimento (To analyze an experiment)
- Participar en un experimento (To participate in an experiment)

When describing the outcome of an experiment, adjectives play a crucial role. If the hypothesis was proven, the experimento is concluyente. If it didn't yield clear results, it is inconcluso. If the procedure was dangerous, it is a experimento arriesgado.

Estamos llevando a cabo un experimento de campo para observar las aves.

We are carrying out a field experiment to observe the birds.

In a sentence, experimento often functions as the direct object. For example: "El profesor explicó el experimento." It can also be part of a prepositional phrase: "Los resultados del experimento fueron sorprendentes." In Spanish, word order is flexible, but placing the noun after the verb is standard for clarity.

¿Te gustaría ser parte de este experimento?

Sentence Patterns: 1. [Subject] + [Verb] + un experimento. (Juan hizo un experimento).
2. Los resultados de + [Art] + experimento + [Verb]. (Los resultados del experimento son claros).

You will encounter the word experimento in a variety of real-world scenarios. It is not limited to textbooks. If you watch Spanish news, specifically in segments about technology or medicine, this word is a staple. Journalists often report on experimentos genéticos or experimentos espaciales.

El noticiero habló sobre un experimento de energía renovable en Chile.

In the workplace, particularly in startups or marketing agencies, the term is used to describe A/B testing or trial campaigns. A manager might say, "Hagamos un pequeño experimento con este anuncio," meaning they want to test a specific advertisement on a small audience before a full rollout. This usage reflects a modern, agile approach to business.

Pop Culture: On YouTube and TikTok, "experimento social" is a massive category. These videos usually involve a creator acting in a certain way in public to see how strangers react. Phrases like "Esto es un experimento social, no se enojen" (This is a social experiment, don't get mad) are common.

In the kitchen, Spanish speakers often use the word jokingly. If someone asks what they are cooking and the chef is improvising, they might reply, "Es un experimento culinario; espero que sea comestible." This shows the word's flexibility in expressing uncertainty and creativity. Even in politics, a new policy might be described by critics or supporters as an experimento económico, suggesting that its results are yet to be seen.

Este nuevo sistema de transporte es un experimento de la ciudad.

One of the most frequent errors English speakers make is confusing experimento with experiencia. While they look similar and share a root, their meanings are distinct. An experimento is a specific test or trial, whereas experiencia refers to the knowledge or skills gained over time, or a specific event one has lived through.

The Confusion: Incorrect: "Tuve un experimento muy bueno en mis vacaciones."
Correct: "Tuve una experiencia muy buena en mis vacaciones."

Another mistake involves the gender of the word. Since it ends in 'o', it is masculine, but learners sometimes default to feminine because of other abstract nouns ending in 'a'. Always use el or un. Saying "la experimento" is a clear indicator of a beginner level.

✗ Vi la experimento en la tele.
✓ Vi el experimento en la tele.

Spelling is also a minor hurdle. In English, "experiment" has no 'o' at the end. In Spanish, that final 'o' is vital. Also, remember there is no double 'p' or double 'm' in the Spanish version. It is a very phonetic word: ex-pe-ri-men-to. Pronouncing it with an English 'x' sound (eks) is correct, but ensure the 'r' is the single Spanish 'r' sound, not the American bunched 'r'.

Preposition Pitfalls: People often say "experimento en..." when they should say "experimento con...". For example, "un experimento con ratones" (an experiment with mice) is more common than "en ratones" when describing the subjects of the test.

To sound more natural and precise in Spanish, it is helpful to know synonyms and related terms for experimento. Depending on the context, one of these might be more appropriate than the generic word.

Ensayo (Trial/Essay): Commonly used in medical contexts (ensayo clínico) or in the arts (rehearsal). It implies a practice run or a specific type of controlled test.
Prueba (Test/Proof): A very broad term. It can be a physical test, a piece of evidence, or a school quiz. "Hacer una prueba" is often synonymous with "hacer un experimento" in casual speech.
Investigación (Investigation/Research): This refers to the whole process of study, of which an experiment might only be a small part.

El ensayo clínico duró tres años.

The clinical trial lasted three years.

In technical fields, you might also hear muestreo (sampling) or tanteo (trial and error/probing). Tanteo is particularly useful when you are just "feeling things out" without a strict scientific protocol. If you are trying to fix a machine by pressing random buttons, that is more of a tanteo than a formal experimento.

Comparisons: - Experimento: Formal, scientific, or a deliberate trial.
- Prueba: Quick, casual, or evidentiary.
- Ensayo: Clinical, technical, or repetitive practice.

How Formal Is It?

Fun Fact

The root 'per' in 'experimento' is the same root found in 'periglo' (danger), suggesting that early trials were seen as risky endeavors.

Pronunciation Guide

UK /eks.pe.ɾi.ˈmen.to/

US /eks.pe.ɾi.ˈmen.to/

The primary stress is on the penultimate syllable: ex-pe-ri-MEN-to.

Rhymes With

sentimiento momento viento pensamiento alimento movimiento asiento talento

Common Errors

Pronouncing the 'r' like the English 'r' (retroflex).
Adding a 'y' sound after the 'x' (eks-pye-ri-men-to).
Stressing the 'ri' instead of the 'men'.
Making the final 'o' sound like 'ou' (English influence).
Dropping the 'o' entirely.

Difficulty Rating

Reading 1/5

Very easy due to being a cognate.

Writing 2/5

Easy, but remember the 'o' and the single 'r'.

Speaking 2/5

Requires correct placement of stress on 'men'.

Listening 1/5

Clearly distinguishable in speech.

What to Learn Next

Prerequisites

hacer ciencia clase nuevo probar

Learn Next

experiencia investigación hipótesis resultado análisis

Advanced

empirismo metodología variable concluyente serendipia

Grammar to Know

Masculine nouns ending in -o

El experimento, el libro, el gato.

Noun-Adjective Agreement

Experimento exitoso, experimentos exitosos.

Use of 'Realizar' vs 'Hacer'

Realizar is more formal for scientific contexts.

Preposition 'con' for subjects

Experimentos con plantas.

Preposition 'de' for possession/origin

Los resultados del experimento.

Examples by Level

El experimento es hoy.

The experiment is today.

Simple subject-verb-complement structure.

Me gusta el experimento.

I like the experiment.

Use of 'gustar' with a masculine singular noun.

Un experimento pequeño.

A small experiment.

Adjective agreement with masculine noun.

Es un experimento fácil.

It is an easy experiment.

Noun-adjective order.

¿Qué experimento haces?

What experiment are you doing?

Interrogative sentence.

Vemos un experimento.

We see an experiment.

Present tense verb 'ver'.

El experimento de Juan.

Juan's experiment.

Possession using 'de'.

No es un experimento.

It is not an experiment.

Negative sentence structure.

Hacemos un experimento en la escuela.

We are doing an experiment at school.

Present tense of 'hacer'.

El experimento fue muy interesante.

The experiment was very interesting.

Preterite tense of 'ser'.

Necesito agua para mi experimento.

I need water for my experiment.

Preposition 'para' indicating purpose.

Ellos terminaron el experimento.

They finished the experiment.

Preterite tense 'terminaron'.

Este experimento es para niños.

This experiment is for children.

Demonstrative adjective 'este'.

No entiendo este experimento.

I don't understand this experiment.

Negation with 'entender'.

Hay muchos experimentos en el libro.

There are many experiments in the book.

Use of 'hay' with plural noun.

Quiero ver el experimento otra vez.

I want to see the experiment again.

Infinitive after 'querer'.

El científico realizó un experimento social.

The scientist performed a social experiment.

Use of 'realizar' for more formal tone.

Los resultados del experimento son positivos.

The results of the experiment are positive.

Plural subject with possessive phrase.

Si el experimento falla, intentaremos otra cosa.

If the experiment fails, we will try something else.

Conditional 'if' clause.

Este experimento requiere mucha paciencia.

This experiment requires a lot of patience.

Present tense 'requiere'.

He leído sobre un experimento increíble.

I have read about an incredible experiment.

Present perfect tense.

El experimento se llevó a cabo en Madrid.

The experiment was carried out in Madrid.

Passive 'se' construction.

Antes del experimento, debemos preparar todo.

Before the experiment, we must prepare everything.

Temporal preposition 'antes de'.

Fue un experimento culinario muy extraño.

It was a very strange culinary experiment.

Adjective 'culinario' modifying the noun.

El experimento piloto demostró ser un éxito.

The pilot experiment proved to be a success.

Compound noun 'experimento piloto'.

Cuestionan la ética de este experimento médico.

They question the ethics of this medical experiment.

Present tense 'cuestionan'.

El experimento falló debido a un error humano.

The experiment failed due to human error.

Prepositional phrase 'debido a'.

Diseñaron un experimento para medir la velocidad.

They designed an experiment to measure the speed.

Preterite 'diseñaron'.

Los datos del experimento fueron analizados ayer.

The experiment data was analyzed yesterday.

Passive voice with 'ser'.

Participar en un experimento puede ser peligroso.

Participating in an experiment can be dangerous.

Infinitive as subject.

El experimento confirmó la teoría del profesor.

The experiment confirmed the teacher's theory.

Transitive verb 'confirmar'.

No podemos ignorar los hallazgos de este experimento.

We cannot ignore the findings of this experiment.

Modal verb 'poder' with negative.

El experimento de doble ciego eliminó el sesgo.

The double-blind experiment eliminated the bias.

Technical term 'doble ciego'.

Sus teorías se basan en experimentos empíricos.

His theories are based on empirical experiments.

Pronominal verb 'basarse en'.

El experimento supuso un hito en la neurociencia.

The experiment represented a milestone in neuroscience.

Verb 'suponer' meaning 'to represent'.

A pesar del fracaso del experimento, aprendimos mucho.

Despite the failure of the experiment, we learned a lot.

Concessive phrase 'a pesar de'.

El experimento fue criticado por su metodología.

The experiment was criticized for its methodology.

Passive voice with agentive 'por'.

Realizaron experimentos con células madre.

They performed experiments with stem cells.

Technical vocabulary 'células madre'.

El experimento mental de Schrödinger es famoso.

Schrödinger's thought experiment is famous.

Philosophical/Scientific reference.

Cada experimento debe ser reproducible por otros.

Every experiment must be reproducible by others.

Adjective 'reproducible'.

La validez interna del experimento fue cuestionada.

The internal validity of the experiment was questioned.

Academic terminology 'validez interna'.

El experimento desentrañó los misterios del átomo.

The experiment unraveled the mysteries of the atom.

Sophisticated verb 'desentrañar'.

Este experimento es la antítesis de la prudencia.

This experiment is the antithesis of prudence.

Metaphorical use of 'antítesis'.

Los pormenores del experimento se detallan en el anexo.

The details of the experiment are detailed in the appendix.

Noun 'pormenores' (details).

El experimento resultó en una serendipia asombrosa.

The experiment resulted in an amazing serendipity.

Use of 'serendipia'.

Es un experimento sociológico de gran envergadura.

It is a sociological experiment of great magnitude.

Phrase 'de gran envergadura'.

El experimento carece de rigor estadístico.

The experiment lacks statistical rigor.

Verb 'carecer de'.

Someteron el experimento a una revisión por pares.

They subjected the experiment to a peer review.

Phrase 'revisión por pares'.

Common Collocations

Realizar un experimento

Experimento científico

Experimento social

Resultados del experimento

Diseñar un experimento

Experimento fallido

Sujeto de experimento

Experimento piloto

Concluir el experimento

Experimento controlado

Common Phrases

A modo de experimento

— Doing something as a trial or test.

Lo hice a modo de experimento.

Experimento de campo

— An experiment done in a natural environment.

Es un experimento de campo sobre aves.

Hacer experimentos

— To try out new things (often used for cooking).

Me gusta hacer experimentos en la cocina.

Experimento mental

— A thought experiment.

Es un experimento mental filosófico.

Experimento a ciegas

— A blind experiment where subjects don't know the variables.

Hicieron un experimento a ciegas.

Bajo experimento

— Undergoing testing.

La nueva droga está bajo experimento.

Experimento casero

— A home-made experiment.

Hicimos un experimento casero con vinagre.

Experimento de laboratorio

— An experiment in a controlled lab setting.

Es un típico experimento de laboratorio.

Puro experimento

— Something that is just a trial and not final.

Este diseño es puro experimento.

Experimento fallido

— An experiment that did not work as expected.

El experimento fallido nos enseñó mucho.

Often Confused With

experimento vs Experiencia

Refers to life experience or knowledge, not a scientific trial.

experimento vs Excremento

Phonetically similar but means waste/feces; be very careful with pronunciation!

experimento vs Expediente

Refers to a file or record, not a trial.

Idioms & Expressions

"Ser el conejillo de Indias"

— To be the guinea pig (the subject of an experiment).

No quiero ser tu conejillo de Indias.

Informal

"Hacer experimentos con gaseosa"

— To take risks only when the stakes are low (literally: experimenting with soda).

No arriesgues tu dinero; haz experimentos con gaseosa.

Colloquial (Spain)

"Estar en fase experimental"

— To be in an experimental phase.

El proyecto está en fase experimental.

Neutral

"Probar fortuna"

— To try one's luck (related to the spirit of experimenting).

Voy a probar fortuna con este experimento.

Neutral

"Ensayo y error"

— Trial and error.

Aprendimos mediante ensayo y error.

Neutral

"Ir a tientas"

— To feel one's way along (experimenting without light/knowledge).

Sin el manual, vamos a tientas.

Informal

"Romper moldes"

— To break the mold (often via an experiment).

Su experimento rompió moldes en el arte.

Literary

"Poner a prueba"

— To put to the test.

Este experimento pondrá a prueba tu teoría.

Neutral

"Jugar a ser Dios"

— To play God (often said of unethical experiments).

Los científicos no deben jugar a ser Dios.

Formal

"Dar palos de ciego"

— To strike out blindly (unsuccessful experimentation).

Están dando palos de ciego con ese experimento.

Informal

Easily Confused

experimento vs Experiencia

Looks like 'experiment'.

Experimento is a test; experiencia is knowledge gained over time.

Tengo experiencia en química, por eso hice el experimento.

experimento vs Ensayo

Both mean a type of test.

Ensayo is often a trial run or a clinical trial; experimento is the broader scientific term.

El ensayo clínico es un tipo de experimento.

experimento vs Prueba

Both translate to 'test'.

Prueba is more general (test, proof, quiz); experimento is more methodical.

La prueba de sangre es parte del experimento.

experimento vs Práctica

Related to doing things.

Práctica is practice or application; experimento is a specific discovery process.

Hacemos la práctica del experimento.

experimento vs Investigación

Both are scientific.

Investigación is the whole research project; experimento is one specific action within it.

Mi investigación incluye tres experimentos.

Sentence Patterns

El [noun] es [adj].

El experimento es bueno.

Hacemos un [noun] en [place].

Hacemos un experimento en casa.

El [noun] sirve para [verb].

El experimento sirve para aprender.

Debido al [noun], sabemos que...

Debido al experimento, sabemos que el gas sube.

A pesar de los resultados del [noun]...

A pesar de los resultados del experimento, seguimos adelante.

El [noun] arrojó datos sobre...

El experimento arrojó datos sobre la luz.

Someter un [noun] a escrutinio.

Debemos someter el experimento a escrutinio.

La naturaleza intrínseca del [noun]...

La naturaleza intrínseca del experimento es incierta.

Word Family

Nouns

experimentación

experimentador

experimento

Verbs

experimentar

Adjectives

experimental

experimentado

experiencia

pericia

experticia

experto

empírico

How to Use It

frequency

Common in academic, scientific, and digital media contexts.

Common Mistakes

La experimento → El experimento
The word is masculine.
Tuve un experimento increíble en Francia. → Tuve una experiencia increíble en Francia.
You mean 'experience' (life event), not a scientific test.
Tomar un experimento → Hacer/Realizar un experimento
You don't 'take' an experiment in Spanish; you 'do' or 'perform' it.
Experimient → Experimento
Don't drop the 'o' and don't add extra 'i's.
Un experimento con ratas en el laboratorio. → Un experimento con ratas en el laboratorio.
Wait, this is correct, but many students forget the 'con' and use 'en'.

Tips

Check the ending

Always end the word with 'o'. In English it ends in 't', but in Spanish, the 'o' is mandatory.

Avoid the false friend

Don't use 'experimento' when you mean 'experience'. Use 'experiencia' for your life stories.

Use in Science

In a lab, use 'realizar' to sound like a pro.

Stress it right

Put the emphasis on 'MEN'. ex-pe-ri-MEN-to.

Cooking experiments

Use it jokingly when you are trying a weird recipe.

Plural agreement

Remember: los experimentos interesantes (everything is masculine plural).

Identify the root

The root 'experi-' is shared with expert, experience, and experiment.

Social Experiments

Look up 'experimento social' on Spanish YouTube to hear the word in natural contexts.

Pilot projects

Use 'experimento piloto' when talking about a small first test of a big idea.

Science Fairs

In many Spanish schools, 'feria de experimentos' is a common event.

Memorize It

Mnemonic

Think of an 'EXPERiment' that ends with an 'O' because it is 'Over' once you see the result.

Visual Association

Imagine a scientist holding a giant letter 'O' like a magnifying glass over a beaker.

Word Web

Ciencia Laboratorio Prueba Hipótesis Datos Química Biología Social

Challenge

Write three sentences about an experiment you would like to do in space.

Word Origin

From the Latin 'experimentum', which comes from 'experiri' (to try, to test).

Original meaning: A trial, test, or proof.

Romance (Latin root).

Cultural Context

Be careful when discussing 'experimentos con animales' as it can be a sensitive topic.

Similar to English usage, but less likely to be used for 'experience' (a common error).

El experimento de la cárcel de Stanford Los experimentos de Pávlov Experimento 626 (Stitch)

Practice in Real Life

Real-World Contexts

Science Class

Mezcla los líquidos.
Anota los resultados.
Usa los guantes.
No toques el fuego.

Cooking

Es una receta nueva.
A ver qué tal sale.
Un poco de esto.
Experimento culinario.

Business

Prueba A/B.
Campaña piloto.
Métrica de éxito.
Validar la idea.

Psychology

Grupo de control.
Sesgo cognitivo.
Respuesta del sujeto.
Observación directa.

Technology

Versión beta.
Test de usuario.
Fallo del sistema.
Innovación constante.

Conversation Starters

"¿Alguna vez has hecho un experimento en la cocina?"

"¿Cuál fue tu experimento favorito en la escuela?"

"¿Qué opinas de los experimentos sociales en YouTube?"

"¿Te gustaría participar en un experimento médico?"

"¿Crees que la vida es un gran experimento?"

Journal Prompts

Describe un experimento que salió mal y qué aprendiste de él.

Si pudieras diseñar un experimento para mejorar tu ciudad, ¿cuál sería?

Escribe sobre un experimento social que hayas observado en la vida real.

¿Es ético hacer experimentos con animales? Explica tu opinión.

Imagina que eres un científico loco: ¿cuál es tu experimento más ambicioso?

Frequently Asked Questions

10 questions

Es masculino: el experimento. Nunca digas 'la experimento'.

Un experimento es un test o prueba (e.g., en un laboratorio). La experiencia es lo que aprendes viviendo (e.g., experiencia laboral).

The verb is 'experimentar'. For example: 'Me gusta experimentar con nuevas ideas'.

Sí, es muy común decir 'experimento culinario' cuando pruebas una receta nueva sin seguir instrucciones precisas.

Es un estudio del comportamiento humano en situaciones reales, a menudo grabado para redes sociales.

Se dice 'conejillo de Indias'. Se usa para la persona que es el sujeto de un experimento.

Sí, se usa mucho en psicología y tecnología, pero 'prueba' o 'examen' son más tradicionales.

Significa que el experimento no dio los resultados esperados o que algo salió mal durante el proceso.

Se pronuncia como 'ks', igual que en inglés, pero más suave.

Ambas son correctas. 'Hacer' es más común al hablar, y 'realizar' es mejor para escribir.