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What are the substances you have at the start of a reaction called?

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Final answer:

Reactants are the substances present at the start of a chemical reaction that undergo change.


Explanation:

Reactants, in a chemical reaction, are the substances present at the start of the reaction. They are the starting materials that undergo change. For example, in the formation of water (H2O) from hydrogen and oxygen, hydrogen and oxygen are the reactants.


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