Accessible paper overall.
Lowest demand: Q2, Q4, Q29, Q30, Q39.
Most demanding: Q17, Q31, Q36, Q38.
Listed in general comments as lowest demand.
Listed in general comments as lowest demand.
‘Not’ must be read carefully; ticks/crosses may help. Weaker candidates appeared to be guessing.
Many recognised the 4:8 ratio but ignored relative masses; option C was a common incorrect choice.
Confusion between weak/strong acids and pH; many chose option B.
Found to be quite challenging with evidence of guessing. (Also listed as most demanding.)
Better candidates had little difficulty; others picked among distractors. Common misconception that bromine is gaseous at RTP (option A most incorrect).
Not well answered. Graphite with acids known, but reactivity of iron and copper not recalled (option B most response).
Weaker candidates appeared to have been guessing.
Listed in general comments as lowest demand.
Listed in general comments as lowest demand.
Greenhouse effect explanation; heat trapped and re-radiated; option B common incorrect. (Most demanding.)
Many didn’t recall alkene + bromine is an addition reaction; option B common incorrect. (Most demanding.)
Challenging peptide-bond vs nylon question; needed to identify monomers correctly; many chose A; some thought ester linkages. (Most demanding.)
Listed in general comments as lowest demand.
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