2.2.12 the Arrhenius equation

what happens to the proportion of molecules that have energy equal to or greater than Ea as temperature increasses

greater proporition: increases

what is the relationship between the rate constant, rate of reaction and the fraction of molecules with energy equal or greater than the activation energy

directly proportional

what is the arrhenius equation

what is k

the rate constant

what is A

the Arrhenius factor

what does A take into account

the frequency of the colliosns with proper orientations

what is Ea and units

activation energy in J mol-1

what is R and units

the gas constant (8.31 J k-1 mol-1)

what is T and what is it measured in

Temperature, K

what is e

mathematical constant

what is the Arrhenius equation using natural logs

what does an increases in the activation energy mean for the rate of reaction

an increase in Ea means the proportion of molecules which posses the activation energy or greater is lower so rate of reaction and k decreases

in a graph of 1/T against lnk, what is the gradient

-Ea/R

what is the y intercept

lnA

write this as an equation using the formula y=mx+c

lnk = -Ea/R x 1/T + lnA

how can the activation energy be calculated

- gradient x R