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Chapter 17
Reaction Rates
9
Chemistry
10th Grade
04/28/2008

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Term
reaction rate
Definition

the change in concentration of a reactant or product per unit time

Term
collision theory
Definition

atoms, ions, and molecules must collide in order to react

Term
activated complex
Definition
a temporary, unstable arrangement of atoms
Term
transition state
Definition
when reactants are just as likely as products to form
Term
activation energy
Definition

minimum amount of energy required for a reaction

Term
catalyst
Definition
substance that increases the rate of a chemical reaction without being consumed
Term
inhibitor
Definition

a substance that slows down a reaction

Term
heterogeneous catalyst
Definition
the catalyst exists in a physical state different from the reaction
Term
homogeneous catalyst
Definition
the catalyst exists in the same physical state as the reaction
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