Activation energy

Question 1

What is activation energy

Answer 1

Minimum amount of energy required to start a reaction

Question 2

Arrhenius equation

Answer 2

k = Ae^-E_a/RT

k = rate constant
A = Arrhenius constant
e = Euler’s no.
E_a = Energy of activation (Joules)
R = Universal gas constant (8.314)
T = Temperature in Kelvin

Question 3

What is the Arrhenius constant (A)

Answer 3

A represents the likelihood that collisions would occur with the proper orientation for reaction

Question 4

Arrhenius plot axes

Answer 4

ln(k) vs 1/T

Question 5

Arrhenius equation in the form y=mx+b

Answer 5

ln(k) = -E_a/RT + ln(A)

Question 6

Steps for determining Ea

Answer 6

Find gradient (m) of Arrhenius plot. Solve using :
m = -E_a/R

Question 7

Steps for determining A

Answer 7

y-intercept = ln(A)