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

The independent variable is the single variable that is changed in an investigation.

The dependent variable is the single variable that is measured or observed in an investigation.

The control variables are variables that are kept constant in an investigation.

Concentration and rate: practical using gas collection method

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 does a graph of volume of gas produced against time show?

What is a common error when using a measuring cylinder to measure the amount of gas produced during a reaction?

Why does increasing the concentration of a reacting solution increase the rate of reaction? 

more particles are present in the same volume

Why does increasing the concentration of a solution increase the frequency of particle collisions?

the same volume of gas is produced for all concentrations

When reacting excess acid with equal amounts of magnesium, how does the concentration of acid affect the volume of gas produced?

time taken for a certain volume of gas to be produced

To ensure a fair test when investigating how concentration affects rate of reaction, which of the following must be kept constant?

increase the surface area of a solid reactant

increase the volume of a reacting solution in excess

decrease the volume of a reacting solution in excess

increase the concentration of a reacting solution

decrease the concentration of a reacting solution

How can we increase the rate of a reaction?

particles must collide with sufficient energy

particles must collide with energy lower than the activation energy

particles must collide without any energy

particles must move in opposite directions

particles must move in opposite directions with the activation energy

According to the collision theory, what must happen for a reaction to occur?

Which equipment can be used to measure the volume of gas in a rate of reaction investigation?

the amount of reactant used per unit time

the time it takes for the reaction to start

the maximum temperature reached during the reaction

If 10 grams of a reactant are used up in 5 seconds, what is the rate of reaction?

the energy needed to form new chemical bonds

the minimum energy required for particles to react upon collision

the maximum energy that particles can have when colliding

Content guidance

Risk assessment required - equipment

Adult supervision required

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