Factors Influencing Reaction Rates
Reactant Concentration: molecular collisions are required for
reactions to occur
reaction rate a collision frequency a concentration
Physical State: molecules must mix to collide
When reactants are in different phases, the more finely divided
a solid or liquid reactant, the greater the surface area per unit
volume, the more contact it makes with other reactants,
and the faster the reaction.
Temperature: molecules must collide with sufficient energy to react
Higher T translates into more collisions per unit time and
into higher-energy collisions
reaction rate a collision energy a temperature
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