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SQA National 5 Chemistry Basics of rate of reaction

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.

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?

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 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?

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

5

How does increasing concentration or pressure affect the frequency of collision? How does it affect the energy of particles?

How does increasing concentration or pressure affect the frequency of collision? How does it affect the energy of particles?

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