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17 Cards in this Set
- Front
- Back
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chemical reaction |
the process in which atoms are rearranged to produce new substances` |
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chemical formula |
uses chemical symbols and numbers to represent a given substance |
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chemical equation |
an expression that uses symbols to show the relationship between the starting substances and the substances that are produced by the chemical reaction |
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reactants |
substances that participate in chemical reactions and their chemical formulas are written on the left |
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products |
the substances formed in a reaction and their chemical formulas are written on the right |
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law of conservation of mass |
states that matter cannot be created or destroyed in ordinary physical or chemical changes |
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coefficient |
a number placed in front of a chemical formula |
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endothermic reaction |
a chemical reaction that requires an input of energy |
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exothermic reaction |
a chemical reaction which energy is given/released to the surroundings |
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law of conservation of energy |
states that energy cannot be created or destroyed, but can change form |
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subscripts |
the number written below and to the right of chemical symbols |
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yields |
an arrow that points at the products |
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concentration |
at higher _____________, there are more reactions in a given volume |
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surface area |
the reaction rate increases when more reactant particles are exposed to one another, and crushing or grinding solids increases their _______ ____ |
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temperature |
reactions occur faster at a higher ___________ |
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catalysts |
a ________ is a substance that changes the rate of a chemical reaction without being used up much |
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4 factors that effect reaction rates |
concentration surface area temperature catalyst |
