Define the term rate of reaction.

Describe the collision theory.

change in concentration of reactant/product with time / rate of change of concentration;

Accept “increase” instead of “change” for product and “decrease” instead of “change” for reactant.

Accept “mass/amount/volume” instead of “concentration”.

Do not accept substance.

collision frequency;

two particles must collide;

particles must have sufficient energy to overcome the activation energy/\(E \geqslant {E_{\text{a}}}\);

Concept of activation energy must be mentioned.

appropriate collision geometry/orientation;

This question was very straightforward and based on kinetics but few scored all the marks available as their ability to correctly define rate of reaction and describe the collision theory was limited.

This question was very straightforward and based on kinetics but few scored all the marks available as their ability to correctly define rate of reaction and describe the collision theory was limited.