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
191–200 of 359 · Easy
Question 191
3 marks · Easy
Answer and see the solution →The extraction of aluminium involves the use of an electrolytic cell.
(a)[1 mark]Name the substance in which aluminium oxide is dissolved for electrolysis.
(b)[2 marks]State the electrode at which aluminium metal is formed and write a half-equation for the reaction occurring there.
Question 192
2 marks · Easy
Answer and see the solution →A factory uses 18,000 kWh of electricity to extract 1 tonne of aluminium by electrolysis, while producing 1 tonne of iron by reduction with carbon uses 800 kWh. Calculate how many times more electricity is used to produce 1 tonne of aluminium than 1 tonne of iron. Give your answer to the nearest whole number.
Question 193
2 marks · Easy
Answer and see the solution →Manganese (a metal) can be extracted from its oxide, MnO2, by heating with aluminium powder. Explain why manganese can be extracted this way, and what this shows about its position in the reactivity series.
Question 194
1 mark · Easy
Answer and see the solution →State why copper, which is above carbon in the reactivity series, cannot be extracted from copper(II) oxide by heating with carbon.
Question 195
3 marks · Easy
Answer and see the solution →The diagram shows the extraction of aluminium from aluminium oxide.
Electrolysis cell for aluminium extraction Aluminium oxide is dissolved in molten cryolite and electrolysed.
(a)[1 mark]State the formula of aluminium oxide.
(b)[1 mark]Give the reason why cryolite is used in this process.
(c)[1 mark]Write the half-equation for the reaction at the cathode.
Question 196
2 marks · Easy
Answer and see the solution →A company is deciding whether to extract a metal by carbon reduction or electrolysis. It costs £70 to make 1 tonne of metal using carbon reduction and £780 to make 1 tonne of aluminium using electrolysis.
Calculate how much more expensive it is to produce aluminium by electrolysis rather than using carbon reduction.
Question 197
1 mark · Easy
Answer and see the solution →State one reason why aluminium resists corrosion.
Question 198
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 199
2 marks · Easy
Answer and see the solution →Explain why steel is an alloy and why it is harder than pure iron.
Question 200
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.