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18.1 Defintions
Science
| Question | Answer |
|---|---|
| chemical reaction | produces new substances by changing the way in which atoms are arranged |
| reactants | substances that present at the beginning of a chemical reaction |
| products | substances formed by a chemical reaction |
| precipitate | a solid product that may form when chemicals in two liquids react |
| catalyst | a substance that increases the rate of a chemical reaction but is not itself in the reaction |