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]OCR Gateway GCSE Chemistry June 2019 Paper 2
5 questions on this paper's topics
20:001 of 5
A student adds small pieces of four metals to dilute hydrochloric acid and to water.
| Metal | With dilute acid | With water |
|---|---|---|
| A | Vigorous fizzing | Slow bubbles |
| B | Slow bubbles | No reaction |
| C | No reaction | No reaction |
| D | Too dangerous to try | Vigorous fizzing, melts |
.1
Use the results to put the metals in order of reactivity, most reactive first.
[1 mark].2
Which metal could be copper?
[1 mark].3
Complete the word equation: magnesium + hydrochloric acid → magnesium chloride + ______
[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]Acids react with metals, bases and carbonates to make salts.
.1
Name the salt made when magnesium oxide reacts with hydrochloric acid.
[1 mark].2
Name the salt made when sodium hydroxide reacts with sulfuric acid.
[1 mark].3
Name the gas produced when calcium carbonate reacts with hydrochloric acid.
[1 mark]