The Arrhenius Equation

Rate and temperature

• increase temperature = particles have more kinetic energy so they speed up and collide more often

• also means more reactant particles will have the required activation energy for the reaction to a greater proportion of collisions will result to a reaction happening

= increased rate

Temperature, rate and rate constant

changing temp ≠ effect on concentration of reactants

so you’d have to change the rate constant

at a higher temp = higher rate constant

Arrhenius Equation

The Arrhenius equation expresses the relationship between the rate constant (k) of a reaction with activation energy and the temperature (T)

A is the pre-exponential factor, Ea is the activation energy, and R is the gas constant.

Rate constant and activation energy

activation energy gets bigger = rate constant gets smaller

Rate constant and temperature

temperature increases = rate constant increases

rearranging the Arrhenius equation

Arrhenius plots

Finding the value of Ea

Finding the value of ln A

Finding the value of A (another way)