Lesson 5.4.3.3
5.4.3.3 Using electrolysis to extract metals Quiz: AQA Combined Science, Unit 11
20 questions
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Lesson 5.4.3.3, Using electrolysis to extract metals: 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
-
Which method extracts a metal too reactive for carbon reduction?
- Distillation
- Electrolysis
- Neutralisation
- Thermal decomposition
-
Why is electrolysis used instead of carbon reduction for very reactive metals?
- Carbon melts too easily
- Metals form covalent bonds
- Metal reacts with carbon
- Carbon is too expensive
-
What is a major industrial disadvantage of extracting metals by electrolysis?
- Toxic catalysts
- High energy use
- Low purity
- Slow reaction rate
-
What molten mixture is electrolysed to manufacture aluminium?
- Bauxite and graphite
- Aluminium chloride and carbon
- Aluminium oxide and cryolite
- Aluminium sulfate and water
-
What material is used for the positive electrode in aluminium extraction?
- Copper
- Iron
- Platinum
- Carbon
-
What is formed at the cathode in the extraction of aluminium?
- Oxygen gas
- Carbon dioxide
- Cryolite
- Molten aluminium
-
What is the purpose of adding cryolite during aluminium extraction?
- Lowers melting point
- Prevents oxidation
- Increases conductivity
- Removes impurities
-
Why must the positive carbon electrode be continually replaced during aluminium extraction?
- Melts from heat
- Reacts with oxygen
- Dissolves in cryolite
- Absorbs aluminium
-
How many electrons does each Al3+ ion gain at the cathode?
- 6
- 3
- 1
- 2
-
Why is pure aluminium oxide not electrolysed on its own?
- Poor conductor
- High melting point
- Reacts with electrodes
- Toxic fumes
-
Which process uses the most energy during aluminium extraction?
- Replacing anodes
- Melting and current
- Crushing the ore
- Cooling the metal
-
Which substance is mixed with aluminium oxide to lower its melting point during extraction?
- Cryolite
- Bauxite
- Limestone
- Graphite
-
Which metal is typically extracted by electrolysis?
- Copper
- Aluminium
- Carbon
- Gold
-
What happens to aluminium ions at the cathode during electrolysis?
- Lose neutrons
- Gain electrons
- Lose electrons
- Gain protons
-
Why must the carbon anode be continually replaced during aluminium extraction?
- Absorbs aluminium atoms
- Reacts with oxygen
- Dissolves in cryolite
- Melts from heat
-
What mass of aluminium is produced from the electrolysis of 102 g of aluminium oxide? (Al2O3 = 102, Al = 27)
- 102 g
- 108 g
- 54 g
- 27 g
-
How many moles of electrons are needed to produce 2 mol of aluminium?
- 6 mol
- 2 mol
- 3 mol
- 4 mol
-
What is formed at the anode in aluminium extraction besides oxygen?
- Cryolite
- Aluminium
- Carbon dioxide
- Hydrogen
-
Which half equation shows the reaction at the cathode in aluminium extraction?
- Al3+ + 3e- -> Al
- Al3+ + e- -> Al
- 2O2- -> O2 + 4e-
- Al -> Al3+ + 3e-
-
What mass of aluminium is produced when 0.6 mol of electrons is passed through molten aluminium oxide? (Al = 27)
- 10.8 g
- 5.4 g
- 1.8 g
- 16.2 g
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