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| Term | Definition |
|---|---|
| Law of Conservations of Matter (mass) | A law that states that mass cannot be created or destroyed in ordinary chemical and physical changes. |
| Reactant | A substance or molecule that participates in a chemical reaction. |
| Product | A substance that forms in a chemical reaction. |
| Coefficient | A number written before a chemical formula which shows how many molecules of a compound are present. |