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
471–480 of 869
Question 471
2 marks · Normal
Answer and see the solution →Give one reason why electrolysis is used to extract aluminium, but iron is extracted by reduction with carbon.
Question 472
4 marks · Normal
Answer and see the solution →Scandium is a metal above carbon in the reactivity series. It can be extracted from its oxide by heating with calcium. Use your knowledge of the reactivity series to answer the questions.
(a)[2 marks]Explain why calcium can be used to extract scandium from its oxide.
(b)[2 marks]Suggest one reason, other than expense, why this method might not be widely used for large-scale scandium extraction.
Question 473
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 474
5 marks · Hard
Answer and see the solution →(a)[1 mark]State the position of aluminium and carbon in the reactivity series.
(b)[2 marks]Describe what happens when carbon is heated with aluminium oxide.
(c)[2 marks]Explain, in terms of the reactivity series, why aluminium cannot be extracted from aluminium oxide by heating with carbon.
Question 475
2 marks · Hard
Answer and see the solution →State the substance in which aluminium oxide is dissolved for electrolysis, and explain why this substance is used.
Question 476
2 marks · Hard
Answer and see the solution →Chromium can be extracted from chromium(III) oxide by heating it with aluminium powder. Describe how this reaction shows the use of a more reactive metal in extraction, and explain why aluminium is used instead of carbon.
Question 477
1 mark · Easy
Answer and see the solution →State one reason why aluminium resists corrosion.
Question 478
3 marks · Easy
Answer and see the solution →Brass is an alloy made from copper and zinc. Use your knowledge of alloys to answer the following:
(a)[1 mark]Define the term "alloy."
(b)[2 marks]Explain, in terms of structure, why brass is harder than pure copper.
Question 479
2 marks · Easy
Answer and see the solution →Explain why steel is an alloy and why it is harder than pure iron.
Question 480
3 marks · Easy
Answer and see the solution →The table shows properties of two metals.
Properties of metals Metal Density (g/cm³) Main Use Aluminium 2.7 Aircraft bodies Copper 8.9 Electrical wiring (a)[1 mark]Which metal in the table has the lower density?
(b)[1 mark]State the main use of copper shown in the table.
(c)[1 mark]Suggest why aluminium is used in aircraft bodies instead of copper.