Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Inorganic Chemistry
869 practice questions
Topics covered
- The Alkali Metals85 practice questions
- The Halogens86 practice questions
- Gases in the Atmosphere86 practice questions
- Reactivity Series163 practice questions
- Extraction and Uses of Metals128 practice questions
- Acids, Alkalis and Titrations83 practice questions
- Acids, Bases and Salt Preparations156 practice questions
- Chemical Tests68 practice questions
Practice questions
201–210 of 374 · Normal
Question 201
3 marks · Normal
Answer and see the solution →Aluminium is extracted by electrolysis, while iron is extracted by reduction with carbon. The extraction of 1 tonne of aluminium requires 14,000 kWh of electricity at a cost of £0.12 per kWh. The extraction of 1 tonne of iron requires 500 kWh of electricity at the same cost per kWh. Calculate the difference in electricity cost between extracting 1 tonne of aluminium and 1 tonne of iron, and explain one reason why aluminium is extracted by electrolysis rather than by carbon reduction.
(a)[2 marks]Calculate the electricity cost to extract 1 tonne of aluminium and 1 tonne of iron.
(b)[1 mark]Explain one reason why aluminium is extracted using electrolysis rather than by reduction with carbon.
Question 202
2 marks · Normal
Answer and see the solution →State two reasons why aluminium is widely used for making aircraft bodies.
Question 203
4 marks · Normal
Answer and see the solution →The diagrams below show simplified structures of a pure metal and an alloy. Study them and answer the questions.
(a)[1 mark]Define the term 'alloy.'
(b)[3 marks]Explain why alloys are usually harder than pure metals. You may use diagrams in your answer.
Question 204
3 marks · Normal
Answer and see the solution →Brass is an alloy of copper and zinc, and is often used for making musical instruments.
Explain, in terms of its structure, why brass is harder than pure copper. Your answer should refer to the arrangement of atoms.
Question 205
4 marks · Normal
Answer and see the solution →The table shows the melting point and main use of some metals.
Properties and uses of metals Metal Melting point (°C) Main use Aluminium 660 Overhead electricity cables Copper 1085 Electrical wiring Iron 1538 Building structures (a)[2 marks]Which metal from the table is most suitable for overhead power cables? Give one reason for your choice.
(b)[2 marks]Explain why copper is commonly used for making electrical wiring.
Question 206
1 mark · Normal
Answer and check →Why are alloys harder than pure metals?
- A.Alloys contain atoms of different sizes, which disrupt the layers.
- B.Alloys have fewer atoms.
- C.Alloys are always magnetic.
- D.Alloys have higher melting points.
Question 207
2 marks · Normal
Answer and see the solution →Give two reasons why copper is used for making electrical wiring.
Question 208
4 marks · Normal
Answer and see the solution →The diagrams show a pure metal and an alloy. Use your knowledge of structure and properties to answer the questions.
(a)[1 mark]Describe the arrangement of atoms in a pure metal.
(b)[3 marks]Explain why the alloy is harder than the pure metal.
Question 209
3 marks · Normal
Answer and see the solution →Aluminium is often used to make power transmission cables because it has a low density and is a good conductor of electricity. A section of cable is made of pure aluminium and has a mass of and a volume of .
Calculate the density of aluminium in . State one reason, based on its properties, why aluminium is chosen for this use.
Density = mass ÷ volume
(a)[2 marks]Calculate the density of aluminium in .
(b)[1 mark]State one property of aluminium that makes it suitable for use in power cables.
Question 210
2 marks · Normal
Answer and see the solution →State why pure aluminium is rarely used for making structures. Briefly explain how adding other elements strengthens aluminium alloys.