AQA GCSE Combined Science June 2025 Chemistry Paper 2F: timed practice

6 marksFoundation and Higher5.7.1.2 Fractional distillation and petrochemicals5.7.1.3 Properties of hydrocarbons

AQA Trilogy 8464

Spec and skills

Paper scope: C2
Spec 5.7.1.2
Spec 5.7.1.3
Original practice question
Answer and supported method checks

Crude oil is separated into fractions in a fractionating column.

Explain how fractional distillation separates crude oil into fractions.

[6 marks]

6 marksFoundation and Higher5.10.2.1 Life cycle assessment

AQA Trilogy 8464

Spec and skills

Paper scope: C2
Spec 5.10.2.1
Original practice question
Answer and supported method checks

The table shows data from a life cycle assessment of two shopping bags, each used once.

Table: the plastic bag uses 0.6 megajoules and 1.2 grams of raw material from crude oil, releases 0.12 kilograms of carbon dioxide, and lasts a very long time in landfill; the paper bag uses 1.5 megajoules and 50 grams of raw material from trees, releases 0.34 kilograms of carbon dioxide, and biodegrades in weeks.
Measure	Plastic bag	Paper bag
Energy used in MJ	0.6	1.5
Raw material	Crude oil (finite)	Trees (renewable)
Carbon dioxide released in kg	0.12	0.34
After disposal	Lasts many years in landfill	Biodegrades in weeks

Evaluate the environmental impact of the two bags. Use the data in the table.

[6 marks]

6 marksFoundation and HigherRequired practical 115.6.1.2 Factors which affect the rates of chemical reactions

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Spec and skills

Paper scope: C2
Spec 5.6.1.2
Original practice question
Answer and supported method checks

A student investigates how the concentration of hydrochloric acid affects the rate of its reaction with magnesium ribbon. Hydrogen gas is produced.

Plan an investigation using a gas collection method. Include the variables the student should control.

[6 marks]

5 marksFoundation and Higher5.9.1.3 How oxygen increased5.9.1.4 How carbon dioxide decreased

AQA Trilogy 8464

Spec and skills

Paper scope: C2
Spec 5.9.1.3
Spec 5.9.1.4
Original practice question
Answer and supported method checks

Earth's early atmosphere probably contained a lot of carbon dioxide and little or no oxygen.

.1

Explain how the amount of oxygen in the atmosphere increased.

[2 marks]

.2

Describe three ways the amount of carbon dioxide in the atmosphere decreased.

[3 marks]

3 marksFoundation and Higher5.6.2.2 Energy changes and reversible reactions5.6.2.1 Reversible reactions

AQA Trilogy 8464

Spec and skills

Paper scope: C2
Spec 5.6.2.2
Spec 5.6.2.1
Original practice question
Answer and supported method checks

When ammonium chloride is heated it decomposes into ammonia and hydrogen chloride. On cooling, they react to form ammonium chloride again.

\mathrm{NH_{4}Cl \rightleftharpoons NH_{3} + HCl}

.1

The forward reaction takes in 176 kJ for each mole of ammonium chloride. Give the energy released when one mole of ammonium chloride forms from ammonia and hydrogen chloride.

[1 mark]

.2

Explain why ammonium chloride reforms at the cool top of a test tube when it is heated at the bottom.

[2 marks]