Factors Affecting Reaction Rate

Question 1

Pressure

Answer 1

As the reactants are gases pressure will affect the reaction rate.
The higher the pressure the same number of particles are forced into a smaller space, so the
chance of collision is increased. The reaction rate will increase as there will be more
collisions.

Question 2

TEMPERATURE

Answer 2

Increasing the temperature will increase the kinetic energy of the reactant molecules. The
molecules will move around faster, and the chance of collision will increase. Increasing the
collision frequency increases the reaction rate.
Increasing the temperature also increases the proportion of reactant molecules with the
required activation energy. As more molecules would have the required activation energy
this will also increase the reaction rate.

Question 3

Catalyst

Answer 3

A catalyst provides an alternative route of lower activation energy. If the activation energy is lowered more molecules will have the required activation energy so the reaction rate will increase.

Question 4

Surface area

Answer 4

An increase in surface area allows more reactant molecules to reach the catalyst surface and so increases the rate of the reaction. For a catalyst to be effective the reactant molecules must contact the surface of the catalyst.

Question 5

Oxidise catalyst

Answer 5

The use of an oxidise catalyst increases the surface area

Question 6

Concentration

Answer 6

The greater the concentration of the species in a liquid or gaseous mixture, the greater the number of particles which increases collision frequency.

Question 7

Why is the rate of reaction always fastest and the start of a reaction?

Answer 7

There is high concentration of molecules.