| Term | Definition |
|---|
| collision model | A model based on the idea that molecules must collide in order to reaction; used to account for the observed characteristics of reaction rates |
| activation energy (Ea) | The threshold energy that must be overcome to produce a chemical reaction |
| catalyst | a substance that speeds up a reaction without being consumed |
| enzyme | a large molecule, usually a protein, that catalyzes biological reactions |
| chemical equilibrium | A dynamic reaction system in which the concentrations of all reactants and products remain constant as a function of time |
| law of chemical equilibrium | a general description of the equilibrium condition; it defines the equilibrium expression |
| equililbrium expression | the expression equal to the product of the product concentrations divded by the product of the reactant concentrations, each concentration having been raised to a power represented by the coefficient in the balanced equation |
| equililbrium constant | the value obtained when equilibrium concentrations of the chemical species are substituted into the equilibrium expression |
| equilibrium position | a particular set of equilibrium concentrations |
| homogenous equilibria | an equilibrium system in which all the reactants and products are in the same state |
| heterogeneous equilibria | an equilibrium involving reactants and/or products in more than one state |
| Le Chatelier's principle | if a chnage is imposed on a system at equilibrium, the position of the equilibrium will shift in a direction that tends to reduce the efffect of that change |
| solubility product | the constant for the equilibrium expression representing the dissolving of an ionic solid in water |
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