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        | The minimum quantity of energy that the reacting species must possess in order to undergo a specified reaction. |  | 
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        | A substance that speeds up a chemical reaction, but is not consumed by the reaction. |  | 
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        | A # placed in front of the parts of a chemical equation to indicate how many are involved; Always a positive whole #. |  | 
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        | A reaction in which a substance rapidly combines with Oxygen to form 1 or more oxides. |  | 
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        | A reaction where a compound breaks down into 2 or more simpler substances. |  | 
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        | A reaction where the positive & negative portions of 2 ionic compounds are inter-charged; At least 1 product must be water or a precipitate. |  | 
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        | Describes & measures the degree of disorder in a process. |  | 
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        | To condense & fall from the air as rain, snow, sleet, or hail. To cause (a solid substance) to be separated from a solution. |  | 
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        | A new substance formed when reactants undergo chemical change. |  | 
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        | To cause (a substance/substances) to undergo a reaction. |  | 
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        | A substance that undergoes a reaction. |  | 
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        | Rate of change in the concentrations of the reactants & products can be characterize the rate of a chemical reaction. |  | 
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        | A type of reaction where 1 element takes the place of another in a compound. |  | 
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        | Name given to a reaction in which 2 or more substances combine to form a single replacement. |  | 
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