Metals above carbon in the reactivity series
2 marks · EasyA 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.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
£710 £ (±1)
Common mistakes: Subtracting in the wrong order
Show mark scheme and worked solution
Marking points
M1 · 1 mark · Selects correct operation: subtracts £70 from £780. (follow-through)
A1 · 1 mark · Correct value: £710. (follow-through)
Worked solution
Cost of aluminium (electrolysis) = £780
Cost of metal by carbon reduction = £70