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What is a chemical reaction

User Skyporter
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A chemical reaction is when a substance (or a few substances) change into another substance. Chemical reactions are chemical transformations.When making beer, yeast turns the sugar into alcohol: that's a chemical reaction. When something iron rusts because of exposure to air, that's a chemical reaction. There are many types of chemical reactions, but they all involve transformations or changes. Water boiling — becoming a gas — is not a chemical reaction, since the steam is still water; the substance didn’t change.

User Andrew Kulakov
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a process that involves rearrangement of the molecular or ionic structure of a substance, as opposed to a change in physical form or a nuclear reaction
User Navyah
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