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Basics of rate of reaction for SQA Higher Chemistry

Basics of rate of reaction

This page covers the following topics:

1. Rate of reaction
2. Frequency of collisions
3. Frequency of collisions

Reactions occur due to the collision of different types of molecules which must have enough energy to react with one another, this is called collision theory. The frequency and energy level of these collisions is what determines rate of reaction.

Rate of reaction

The frequency of successful collisions can be influenced by many factors such as temperature, pressure and concentration of reactants.

Frequency of collisions

The frequency of successful collisions can also be influenced by surface area (of solid reactants) and state of matter (solid/liquid/gas) of the reactants.

Frequency of collisions

1

Describe the rate of successful collisions in a reaction between two solids.

The particles in mixture of two solids react very slowly or not at all as few particles are able to make contact with each other, thus the frequency of successful collisions is low. For this reason reactions between two solids are rare.

Describe the rate of successful collisions in a reaction between two solids.

2

What is the effect on rate of reaction if frequency of successful collisions increases?

Rate of reaction increases

What is the effect on rate of reaction if frequency of successful collisions increases?

3

The lines on this graph show the reaction between zinc and hydrochloric acid. Which line indicates the reaction undertaken at a lower temperature?

The reaction shown by the black line.

The lines on this graph show the reaction between zinc and hydrochloric acid. Which line indicates the reaction undertaken at a lower temperature?

4

What two things could you measure to measure rate of reaction?

loss of reactants or formation of products

What two things could you measure to measure rate of reaction?

5

How does increasing concentration affect the frequency of collision between particles in a chemical reaction?

Increasing concentration increases the frequency of collisions between the particles.

Increasing concentration increases the overall frequency of collisions.

How does increasing concentration affect the frequency of collision between particles in a chemical reaction?

End of page

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