AQA GCSE Combined Science June 2022 Chemistry Paper 1F: timed practice

6 marksFoundation and HigherRequired practical 085.4.2.3 Soluble salts

Spec and skills

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 Higher5.1.2.5 Group 15.1.2.6 Group 7

Spec and skills

Group 1 and group 7 elements both show trends in reactivity.

Reactivity increases down group 1 but decreases down group 7. Explain these two trends in terms of electrons.

[6 marks]

4 marksFoundation and Higher5.2.1.3 Ionic compounds5.2.1.2 Ionic bonding

Spec and skills

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 Higher5.2.2.6 Giant covalent structures5.2.2.5 Polymers

Spec and skills

Silicon dioxide (silica) melts at 1710 °C. Poly(ethene) softens at about 120 °C. Methane boils at −162 °C.

Explain the differences in these temperatures. Refer to the structure and bonding of each substance.

[6 marks]

6 marksFoundation and HigherRequired practical 095.4.3.4 Electrolysis of aqueous solutions

Spec and skills

A student investigates what is produced when aqueous solutions of copper chloride and sodium chloride are electrolysed using inert electrodes.

Plan an investigation to find the products at each electrode for both solutions. Include how you would identify any gases.

[6 marks]