click below
click below
Normal Size Small Size show me how
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 |