Chemistry: Kinetics Concepts

The factors that determine wether a reaction will occur or not:


ACTIVATION ENERGY: minimum amount of energy needed for reaction to occur during a properly oriented collision. A lower activation energy means a higher rate of reaction and vice-versa. It varies from reaction to reaction.

Factors that affect the rate of reaction:

CONCENTRATION: higher concentration leads to more effective collisions per unit time.

TEMPERATURE: higher temperature means higher kinetic energy.

MEDIUM: rate may differ if reaction occurs in aqueous, liquid, etc. solution.

CATALYSTS: catalysts lower the activation energy because it permits a different pathway for the reaction to occur. Lower activation energy, higher rate of reaction.

Maxwell-Boltzmann: plot of the number of particles having each particular energy. It tells you the amount of particles that can reach the activation energy. Also what amount of energy most particles can have. A catalyst affects the graph by increasing the frequency of collisions between reactants, altering the orientation of reactants so that more collisions are effective.



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