Factors Affecting Rates of Reactions

Factors Affecting Reaction Rates
In general, something that increases the number of collisions between particles will increase the reaction rate.

Concentration: High concentration of reactants leads to more effective collisions per unit time, which increases reaction time
low concentration=few collisions
high concentration=more collisions=faster reaction rate

Catalyst: lowers the activation energy of a chemical reaction and increases the reaction rate
-increasing frequency of collisions, alter orientation of reactants to make the collisions more effective and reduce extra molecules bonding within reactant molecules not consumed during reaction

Surface Area: increasing surface area has no affect on the energy of the particles, but it increases the number of sites available for the reaction to occur at