Chemistry · May / June 2023 · Paper 41 · Question 5
0620
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This question is about electricity and chemical reactions.
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5(a)(i)[2]
M1 breakdown by (the passage of) electricity(1)
M2 of an ionic compound in molten or aqueous (state) (1)
5(a)(ii)[1]
graphite is inert AND graphite conducts electricity
2H+ + 2e– → H2
5(a)(iii)[2]
M1 H+ + e as only species on LHS(1)
M2 equation correct(1)
5(a)(iv)[1]
electrons
5(a)(v)[1]
ions
5(a)(vi)[2]
M1 oxygen(1)
M2 hydrogen(1)
5(b)(i)[1]
aluminium oxide
5(b)(ii)[2]
any two from:
solvent
lowers the operating temperature
increases conductivity
5(b)(iii)[1]
carbon reacts with oxygen and forms carbon dioxide
2H2 + O2 → 2H2O
5(c)(i)[2]
M1 all formulae(1) M2 equation correct(1)
5(c)(ii)[1]
no carbon dioxide evolved
OR
more efficient
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