Chemistry Required Practical: Rates of Reaction

GCSE Chemistry Required Practical - Rates of Reaction

Investigate the effects of changing the conditions of a reaction on the rates of chemical reactions by:
a) observing a colour change (in the reaction between sodium thiosulfate and hydrochloric acid)
b) measuring the production of a gas (in the reaction between hydrochloric acid and marble chips)

Rates of Reaction - GCSE Science Required Practical

Activity 1:
How does the concentration of sodium thiosulphate affect the rate of reaction?
Investigating measurement of rate of reaction using colour change or turbidity
In this practical you will:

• react different concentrations of sodium thiosulfate with hydrochloric acid
• use a stop clock to time how long it takes for the mixture to become cloudy for each concentration
• use your results to work out how the rate of reaction changes as the concentration of the sodium thiosulfate changes.

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Activity 2:
How does the concentration of an acid affect the rate of reaction?
Measure the volume of gas produced to determine the rate of reaction.
In this practical you will:

• react magnesium ribbon with different concentrations of hydrochloric acid
• measure the volume of gas produced for each concentration.
• use your results to work out how the rate of reaction is affected by the concentration of the acid.

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GCSE Chemistry Required Practical: Rates of Reaction

Describe how to carry out a practical investigation to explore the effect of concentration on the rate of reaction.
Explore two different practicals that you need to know. Look at the ideas of a hypothesis and reproducibility, which could be asked in your exam.

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Check out the sample question and solution on Sample Assessment Material (page 80).
This example is taken from the sample assessment material, paper 1CH0/2F, Q5.

A student used the equipment in Figure 6 to investigate the rate of reaction between zinc and excess dilute hydrochloric acid.

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