Chemistry · Oct / Nov 2020 · Paper 41 · Question 3
0620
As printed in the paper
Show the answer and mark scheme
3(a)[1]
2 → 2 + 2
3(b)[1]
75(%)
3(c)[2]
test: (damp red) litmus paper (1)
result: (litmus goes) blue (1)
3(d)(i)[1]
diffusion
3(d)(ii)[2]
particles move from an area of high to low concentration
particles move randomly
3(d)(iii)[1]
CO2 molecules are heavier (than NH3)
3(e)(i)[2]
lower temperature: (rate of reaction) slower (1)
higher pressure: expensive/specialist equipment
3(e)(ii)[1]
catalyst
3(f)(i)[1]
proton acceptor
3(f)(ii)[1]
any value greater than 7 up to 12
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