Physical Science Ch 5
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Created by:
__kyle__ on March 1, 2010
Subjects:
physical science, science, science vocab, science key terms, science vocabulary
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19 terms
Terms | Definitions |
|---|---|
 precipitate | a solid that forms from a solution during a chemical reaction |
| endothermic reaction | A reaction that absorbs energy in the form of heat |
| exothermic reaction | a reaction that releases energy in the form of heat |
| chemical equation | a short, easy way to show a chemical reaction, using symbols instead of words |
| subscript | a number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound |
| reactants | a substance that enters into a chemical reaction |
| products | A substance formed as a result of a chemical reaction. |
| conservation of mass | the principle stating that matter is not created or destroyed during a chemical reaction |
| coefficient | a number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction |
| synthesis | a chemical reaction in which two or more simple substances combine to form a new, more complex substance |
| decomposition | a chemical reaction that breaks down compounds into simpler products. |
| replacement reaction | A reaction in which one element replaces another in a compound; or in which two elements in different compounds trade places. |
| activation energy | the minimum amount of energy needed to start a chemical reaction |
| concentration | the amount of one material dissolved in a given amount of another material |
| catalyst | a material that increases the rate of a reaction by lowering the activation energy |
| enzyme | a biological catalyst that lowers the activation energy of reactions in cells |
| inhibitor | a material used to decrease the rate of a reaction |
| combustion | a rapid reaction between oxygen and fuel that produces thermal energy |
| fuel | A material that releases energy when it burns |
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