AQA GCSE Chemistry June 2022 Paper 1H: timed practice

4 marksFoundation and Higher

Spec and skills

A student adds an alkali gradually to an acid. The measured pH values after successive additions are 2, 4, 6, 7, 9 and 11.

.1

Describe the change and identify the neutral reading.

[2 marks]

.2

Explain neutralisation in terms of the reacting ions.

[2 marks]

4 marksFoundation and Higher

Spec and skills

A beaker becomes colder when two substances react. A student sketches a reaction profile with products below reactants and no energy barrier.

Explain how the profile should be corrected and what each correction means.

[4 marks]

6 marksHigher

Spec and skills

Copper oxide is reduced by hydrogen:

\mathrm{CuO + H_2 \rightarrow Cu + H_2O}

. A process must produce 12.8 g copper.

A_r

: Cu = 64, O = 16, H = 1.

.1

Calculate the minimum mass of copper oxide needed if conversion is complete.

[4 marks]

.2

Calculate the mass of hydrogen that reacts with this copper oxide.

[2 marks]

5 marksHigher

Spec and skills

A bottle contains carbon dioxide molecules. A sample of magnesium chloride contains

\mathrm{Mg^{2+}}

and

\mathrm{Cl^-}

ions.

.1

Compare how bonds form in the two substances.

[3 marks]

.2

Explain why one magnesium atom needs two chlorine atoms to form the compound.

[2 marks]

6 marksHigher

Spec and skills

A student claims that diamond, graphite and fullerenes have identical properties because all contain only carbon.

Evaluate the claim by connecting structure to properties.

[6 marks]