The collision theory is that particles must collide, and with sufficient energy, in order to react.

The minimum energy that the particles must have in order to react is known as the activation energy.

Rate of reaction is the speed with which a chemical reaction takes place.

An end-point method is used to measure the progress of a reaction until it has reached completion or a desirable point, e.g. a colour change.

Temperature and rate: practical

Combined science

In the Industrial Chemistry unit, pupils will build on their knowledge of reaction rates to learn about the industrial processes involving chemical reactions and the factors that affect them.

In the Energy Changes in Reactions unit, pupils learned about bond breaking, bond making, and reaction profiles.

This unit explores factors influencing reaction rates, including temperature, concentration, surface area, and catalysts. It covers using models and theories to develop hypotheses, planning and conducting experiments safely, selecting appropriate techniques, and presenting and translating data.

Rate of reaction

Physical activity and equipment requiring safe use

What happens to the rate of a chemical reaction when the temperature is increased?

If the temperature of a reaction increases, what happens to the energy of the particles?

it increases the frequency and energy of collisions

it decreases the surface area of reactants

Which of the following explains why increasing temperature increases the rate of reaction?

particles have less energy and collide less often

Why does cooling a reactant decrease the rate of a reaction?

Higher temperatures lead to a greater volume of gas being produced.

Lower temperatures lead to a greater volume of gas being produced.

The temperature does not affect the overall volume of gas that is produced.

Which of the following statements about temperature and volume of gas produced is correct?

more reactant particles have energy higher than the activation energy

less reactant particles have energy higher than the activation energy

What effect does increasing the temperature have on the reactant particles?

Which of the following factors does **not** affect the rate of a chemical reaction?

What happens to the rate of reaction when the temperature is increased?

What is the minimum energy required for a reaction to occur called?

a method to measure the speed of a reaction

a method to measure the progress of a reaction until it reaches a certain point

a method to change the temperature of a reaction

the formation of a gas that covers the cross

the formation of a precipitate that makes the solution cloudy

the consumption of the cross in the reaction

a change in temperature that removes the cross

What causes the cross to disappear in the disappearing cross experiment?

heat the reactants to provide the particles with more energy

heat the reactants to provide the particles with less energy

increase the number of reactant particles in a certain volume

decrease the number of reactant particles in a certain volume

Doing which of the following will increase the rate of a reaction?

Content guidance

Risk assessment required - equipment

Adult supervision required

This lesson will be removed by end of Summer Term 2025.

Temperature and rate: practical

Lesson outcome

Content guidance

This lesson will be removed by end of Summer Term 2025.