Relative atomic masses (): H = 1, C = 12, O = 16, Mg = 24, Cl = 35.5
.1
Calculate the relative formula mass () of water, .
[1 mark].2
Calculate the of carbon dioxide, .
[1 mark].3
Calculate the of magnesium chloride, .
[2 marks]OCR Gateway GCSE Chemistry June 2022 Paper 2
5 questions on this paper's topics
21:001 of 5
Crude oil is a mixture of hydrocarbons.
.1
Define the term hydrocarbon.
[1 mark].2
Butane has 4 carbon atoms. Write the formula of butane.
[1 mark].3
Which fraction is used as fuel for aircraft?
[1 mark]A student adds marble chips to hydrochloric acid and collects the carbon dioxide in a gas syringe.
| Time in s | 0 | 10 | 20 | 30 | 40 | 50 | 60 |
|---|---|---|---|---|---|---|---|
| Volume in cm³ | 0 | 22 | 38 | 50 | 56 | 60 | 60 |
.1
Calculate the mean rate of reaction in the first 30 seconds.
[2 marks].2
Give the earliest time in the table by which the reaction had stopped.
[1 mark].3
Describe how the rate changes during the reaction.
[1 mark]Pure aluminium is soft. Aircraft bodies are made from aluminium alloys.
.1
Explain why pure aluminium is soft.
[2 marks].2
Explain why aluminium alloys are harder than pure aluminium.
[2 marks]Burning fuels can release several pollutants.
.1
Which pollutant is a toxic gas that reduces the blood's ability to carry oxygen?
[1 mark].2
Which pollutant causes global dimming?
[1 mark].3
Name the environmental problem caused by sulfur dioxide dissolving in rain water.
[1 mark]