Rates Of Reaction

Question 1

What is the rate of reaction

Answer 1

How fast the reactants are changed into products

Question 2

Describe collision theory

Answer 2

The rate of reaction depends on the collision frequency of reacting particles, the more collisions, the faster that reaction is
There must be sufficient energy to break the bonds of the reactants (activation energy) for the reaction to be successful

Question 3

How does increasing the temperature increase the rate of reaction

Answer 3

When temperature is increased, the particles move faster, so there are more collisions
There is also increased energy, this results in more successful collisions between the particles

Question 4

How does increasing pressure increase the rate of reaction

Answer 4

There are more reactant particles in the same volume, this increases likelihood of successful collisions as well as collision frequency

Question 5

How does increased surface area increase the rate of reaction

Answer 5

Increased surface area to volume ratio
Particles have an increase area to work on, so the collision frequency will increase

Question 6

How does the presence of a catalyst increase the rate of reaction

Answer 6

A catalyst increases the rate of reaction without being used up
They decrease the activation energy for a reaction to occur
They do this by providing an alternative pathway that has lower activation energy
Therefore more particles have a sufficient amount of energy for successful collisions