Chemistry · Oct / Nov 2020 · Paper 41 · Question 4
0620
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Air is a mixture of gases.
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4(a)[1]
21
4(b)(i)[2]
fractional (1)
distillation (1)
4(b)(ii)[1]
(different) boiling point
4(c)[2]
2 double bonds (1)
whole molecule correct (2 pairs of lone pairs on each O) (1)
4(d)[3]
increase in (concentrations of) carbon dioxide
(carbon dioxide is) greenhouse gas/greenhouse effect
contributes to climate change/global warming
4(e)[1]
photosynthesis
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