Answer ALL parts.

The Collision Theory proposes how reactions occur.

Briefly describe the Collision Theory including some of its assumptions and shortcomings and how the rate of reaction is determined using the Collision Theory.

[7 Marks]

(ii) The Collision Theory states that the Arrhenius frequency factor may be calculated by the following equation.

^1/2 NA

Where NA is Avogadro's number and o is the collision cross section.

Use collision theory to estimate the Arrhenius frequency factor at 450 K for the reaction:

D2 + Br2 DBr + DBr

(Note the collision cross section is estimated to be 0.3 nm², the activation energy is 200 kJ mol-I , D 2 amu, Br 79 amu).

[13 marks]

Using a suitable example in each case, briefly descr