| A | B |
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| chemical reactions | the process by which one or more substances undergo change to produce one or more different substances |
| chemical formula | a shorthand notation for a compound or a diatomic element using chemical symbols and numbers |
| chemical equatoin | a shorthand description of a chemical reaction using chemical formulas and symblos |
| reactants | the starting materials in a chemical reaction |
| products | the substances formed from a chemical reaction |
| law of conservation of mass | the law that states that mass in neither created nor destroyed in ordinary chemical and physical changes |
| synthesis reaction | a reaction in which two or more substances combine to form a single compound |
| decomposition reaction | a reaction in which a single compound breaks down to form two ore simpler substances |
| single-replacement reaction | a reaction in which an element takes the place of another element in a compound |
| double-replacement reaction | a reaction in chich ions in two compound switch places |
| exothermic | the term used to describe a physical or a chemical change in which energy is released or removed |
| endothermic | the term used to describe a physical or a chemical change in which energy is absorbed |
| law of conservation of energy | the law that states that energy is neither created nor destroyed |
| activation energy | the minimum amount of energy needed for substances to react |
| catalyst | a substance that speeds up a reactoin without being permanently changed |
| inhibitor | a substance that slows down or stops a chemical reaction |
