Lesson 5.4.1.3
5.4.1.3 Extraction of metals and reduction Quiz: AQA Combined Science, Unit 11
20 questions
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Lesson 5.4.1.3, Extraction of metals and reduction: 20 multiple choice questions for the AQA GCSE Combined Science (8464), Unit 11: Chemical changes, written with Revision Ninja.
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The 20 questions
-
Why is gold found in the Earth as the pure metal?
- It forms soluble oxides
- It is very dense
- It reacts with carbon
- It is unreactive
-
Which metal can be extracted from its oxide by reduction with carbon?
- Sodium
- Calcium
- Iron
- Potassium
-
What does reduction involve during the extraction of a metal?
- Loss of carbon
- Loss of oxygen
- Gain of carbon
- Gain of oxygen
-
Which equation shows zinc oxide being reduced by carbon?
- ZnO + C -> Zn + CO2
- ZnO -> Zn + O2
- ZnO + C -> Zn + CO
- Zn + CO -> ZnO + C
-
In the extraction of iron, which substance is oxidised?
- Iron
- Carbon
- Carbon dioxide
- Iron oxide
-
Which metal is extracted by heating its oxide with carbon?
- Sodium
- Potassium
- Aluminium
- Copper
-
Why cannot aluminium be extracted by heating its oxide with carbon?
- Aluminium is a liquid
- Aluminium is more reactive
- Carbon is more reactive
- Aluminium is unreactive
-
In the reaction Fe2O3 + 3CO -> 2Fe + 3CO2, which substance is reduced?
- Iron(III) oxide
- Carbon monoxide
- Carbon dioxide
- Iron
-
Why is carbon used to extract zinc from zinc oxide?
- Zinc is unreactive
- Carbon is less reactive
- Zinc is more reactive
- Carbon is more reactive
-
Which metal is found in the Earth as the element itself?
- Iron
- Gold
- Zinc
- Aluminium
-
How are most metals found in the Earth's crust?
- As dissolved gases
- As pure liquids
- As chemical compounds
- As pure elements
-
Which chemical change represents reduction during copper extraction?
- Carbon loses oxygen
- Copper gains oxygen
- Copper oxide loses oxygen
- Copper oxide gains oxygen
-
In PbO + C -> Pb + CO, which substance is oxidised?
- Carbon
- Carbon monoxide
- Lead(II) oxide
- Lead
-
In the equation ZnO + C -> Zn + CO, what happens to zinc oxide?
- It remains unchanged
- It is reduced
- It dissolves
- It is oxidised
-
A student reduces copper oxide with carbon and obtains 6.4 g of copper from 8.0 g of copper oxide. What mass of oxygen is lost?
- 8.0 g
- 14.4 g
- 1.6 g
- 6.4 g
-
What mass of copper forms when 16 g of copper(II) oxide (Mr 80) is reduced by carbon? (Cu = 64)
- 16 g
- 8 g
- 6.4 g
- 12.8 g
-
Which of these metals is extracted from its oxide by reduction with carbon?
- Lithium
- Sodium
- Iron
- Potassium
-
Which equation is balanced for copper(II) oxide reduced by carbon to copper and carbon dioxide?
- 2CuO + C -> Cu + CO2
- CuO + 2C -> Cu + 2CO
- CuO + C -> Cu + CO2
- 2CuO + C -> 2Cu + CO2
-
10.0 g of iron(III) oxide (Mr 160) is reduced completely to iron. What mass of iron forms? (Fe = 56)
- 5.6 g
- 7.0 g
- 3.5 g
- 10.0 g
-
What is the primary chemical role of carbon in metal extraction?
- Adding hydrogen
- Melting the ore
- Removing oxygen
- Providing electrons
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