A chemical is any substance that has a defined composition. In other words, a chemical is always made up of the same "stuff." Some chemicals occur in nature, such as water. Other chemicals are manufactured, such as chlorine (used for bleaching fabrics or in swimming pools).. A chemical substance such as water (H2O) is a pure chemical because it has the same molecules and combination throughout its structure.
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a substance that is used or produced in a chemical process
sulphuric acid is a dangerous substance
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A chemical is any substance that has a defined composition. In other words, a chemical is always made up of the same "stuff." Some chemicals occur in nature, such as water. Other chemicals are manufactured, such as chlorine (used for bleaching fabrics or in swimming pools).. A chemical substance such as water (H2O) is a pure chemical because it has the same molecules and combination throughout its structure.