Edexcel GCSE Combined Science June 2025 Chemistry Paper 1F: timed practice

4 marksFoundation

Spec and skills

Original practice question
Answer and supported method checks

Some substances are listed below. Copper, carbon dioxide, air, sodium chloride.

.1

Which substance is an element?

[1 mark]

.2

Which substance is a mixture?

[1 mark]

.3

Give the number of different elements in the formula

\mathrm{CaCO_{3}}

.

[1 mark]

.4

A student has a mixture of sand and water. Choose the best method to get the sand.

[1 mark]

4 marksFoundation and Higher

Spec and skills

Original practice question
Answer and supported method checks

Some metals are added to solutions of metal sulfates.

.1

Which two mixtures react? Tick two boxes.

[2 marks]

.2

Explain, in terms of ions, why magnesium is more reactive than zinc.

[2 marks]

4 marksFoundation and Higher

Spec and skills

Original practice question
Answer and supported method checks

Aluminium oxide is an ionic compound. It contains

\mathrm{Al^{3+}}

and

\mathrm{O^{2-}}

ions.

.1

Write the formula of aluminium oxide.

[1 mark]

.2

Describe the structure of aluminium oxide.

[3 marks]

6 marksFoundation and Higher

Spec and skills

Original practice question
Answer and supported method checks

A student wants to make pure, dry crystals of copper sulfate from copper oxide (an insoluble black powder) and dilute sulfuric acid.

Plan a method the student could use. In your answer, explain the reason for each step.

[6 marks]

6 marksFoundation and Higher

Spec and skills

Original practice question
Answer and supported method checks

A student wants to find out whether a green food colouring contains the same dyes as two known dyes, P and Q.

.1

Describe how the student could use paper chromatography to do this.

[4 marks]

.2

A spot moves 3.9 cm from the start line. The solvent front is 7.8 cm from the start line. Calculate the Rf value.

[2 marks]