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# chemical

noun (a chemical, chemicals); adjective (chemical); adverb chemically

«chemical» in the English dictionary: everyday — its meanings, how the lessons use it, and examples, each with its tree on Mova.

## Everyday

1. A chemical is a substance, especially one made or used in science or industry, such as bleach, salt or oxygen. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/chemical/#m1)
2. Chemical as an adjective means to do with chemistry or with how substances change: a chemical reaction. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/chemical/#m2)

### In the lessons

In science everything is made of chemicals, including water and air; a chemical reaction makes new substances (burning, rusting, baking a cake). In safety lessons household chemicals like bleach, cleaners and weedkiller are dangerous: never mix them, drink them or keep them in drink bottles, and keep them out of reach of little children. Phrases: chemical reaction, household chemicals, harmful chemicals, chemical change.

### Examples

- Bleach is a strong chemical, so don't touch it. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/chemical/#x1)
- Never mix cleaning chemicals; they can make poisonous gas. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/chemical/#x2)
- Rust is caused by a chemical reaction between iron, water and air. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/chemical/#x3)
- Water is a chemical made of hydrogen and oxygen. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/chemical/#x4)
- Keep chemicals in their own bottles with labels. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/chemical/#x5)
- Baking a cake causes chemical changes in the mixture. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/chemical/#x6)
- The scientist wore goggles when she used the chemicals. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/chemical/#x7)
- Some farmers spray chemicals on crops to kill pests. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/chemical/#x8)
- Now, one day Edmund made a new lantern out of something chemical that he sneaked from the school laboratory. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/chemical/#x9)

### Note

Countable as a noun: a chemical, chemicals. A «chemical change» makes something new and is often hard to undo; a «physical change» (like melting ice) does not make a new substance. Myth: «chemical» does not always mean harmful or unnatural; but unknown liquids should never be tasted or sniffed.

## On Mova

- [Trees and pragmatics of «chemical» in the school dictionary](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/chemical/): every meaning and example parsed by Mova, with its dependency tree and frames.
- [«chemical» in the school dictionary](https://mova.elamur.ai/free/en/dictionaries/school/w/chemical.html) on Mova free.