Chemistry · Oct / Nov 2020 · Paper 41 · Question 2
0620
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Zinc is extracted from an ore containing zinc sulfide.
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2(a)[1]
zinc blende
2(b)(i)[1]
ZnO + C → Zn + CO
or
2ZnO + C → 2Zn + CO2
2(b)(ii)[2]
chemical change: reduction (1)
explanation: oxygen is lost (1)
2(b)(iii)[1]
aluminium is more reactive than carbon
2(b)(iv)[1]
electrolysis
2(c)[3]
exists as layers (1)
(alloy) contains different sized (copper) atoms (1)
makes it more difficult for layers (of atoms) to slide over each slip/shift other (1)
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