OCR Gateway GCSE Chemistry June 2019 Paper 1: 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]

6 marksFoundation and Higher

Spec and skills

Original practice question
Answer and supported method checks

A student wants to investigate how the volume of sodium hydroxide solution added to 25 cm³ of dilute hydrochloric acid affects the temperature change.

Plan an investigation the student could carry out. Include the variables to control and how to make the results as accurate as possible.

[6 marks]

6 marksFoundation and Higher

Spec and skills

Original practice question
Answer and supported method checks

Diamond and graphite are both forms of carbon.

Compare the structure and bonding of diamond and graphite, and use them to explain the differences in hardness and electrical conductivity.

[6 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]

4 marksFoundation and Higher

Spec and skills

Original practice question
Answer and supported method checks

Copper is used for electrical wiring and for the bases of saucepans.

Explain why copper is a good conductor of electricity and of thermal energy. Refer to the structure and bonding of copper in your answer.

[4 marks]