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Chem-Module 14
| Question | Answer |
|---|---|
| Reaction Rate | The rate of change of a product in a chemical reaction |
| In order to react, chemicals must ______ with one another so that their electrons can either be transferred or rearranged | collide |
| Higher temperature increases chemical reaction rate because the reactant molecules (or atoms) move _______, increasing the chance for a collision. | faster |
| Decreasing concentration __________ the chemical reaction rate because there are fewer reactant molecules (or atoms) to collide with one another. | decreases |
| Increasing the surface area of a reactant ________ reaction rate because the molecules (or atoms) of the reactant can more easily mingle with the molecules (or atoms) of the other reactants. | increases |
| Rate equation | R=k[A]x[B]y |
| k= | Rate constant |
| x+y= | overall order of the chemical reaction |
| Sometimes, the rate of a chemical reaction will be ____________ by the concentration o one of its reactants. In this case, the exponent of the rate equation is ______ for that reactant. | unaffected, zero |
| The reaction rate order for a chemical equation must be determined experimentally: they are _______ equal to the stoichiometric coefficients in the chemical equation. | NOT |
| Chemical reactions never actually ______. They just keep getting slower and slower until they proceed imperceptibility slowly.Thus, for any chemical reaction, no matte how long you wait, there will always be some reactants left. | finish |
| The temperature dependence of reaction rate is determined by the variation of the __________ with temperature | rate constant |
| The rate of many chemical reaction _______ for every ____ C increase in temperature | doubles, 10 |
| _______ speed up the reaction rate without actually getting used up in the chemical reaction. | Catalysts |
| Decreasing the activation energy of a reaction ________ its rate | increases |
| Catalysts speed up reaction rates by _______ the activation energy of the reaction. | lowering |
| Heterogeneous Catalysts | Catalysts that are in a different phase than the reactants |
| Homogenous catalysts | Catalysts that have the same phase as at least one of the reactants |
| Reaction mechanism | A series of chemical equations that tells you the step-by-step process by which a chemical reaction occurs |
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akikoandpoog
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