Chemistry Paper 21
Oct / Nov 2018·5070·9 questions
Mock exam: 75 min, official timing
Question paper
Question 1
Question 2
Question 3
Question 4
Question 5
Question 6
Question 7
Question 8
Question 9
Mark scheme
Question 1
1(a)(i)[1]
1(a)(ii)[1]
1(a)(iii)[1]
1(a)(iv)[1]
1(a)(v)[1]
1(b)(i)[1]
1(b)(ii)[1]
Question 2
2(a)(i)[2]
2(a)(ii)[1]
2(b)[3]
2(c)[2]
2(d)[2]
Question 3
3(a)[1]
3(b)[2]
3(c)[1]
3(d)[3]
Question 4
4(a)(i)[1]
4(a)(ii)[1]
4(b)[1]
4(c)[2]
4(d)[1]
4(e)(i)[1]
4(e)(ii)[1]
4(f)(i)[2]
4(f)(ii)[1]
Question 5
5(a)[2]
5(b)[1]
5(c)(i)[1]
5(c)(ii)[1]
5(d)(i)[2]
5(d)(ii)[1]
oxygen diffuses slower because it has a higher (relative) molecular mass / nitrogen diffuses quicker because it has a lower (relative) molecular mass
5(d)(iii)[2]
Question 6
6(a)(i)[2]
6(a)(ii)[1]
6(b)[2]
6(c)[1]
6(d)(i)[1]
6(d)(ii)[2]
6(d)(iii)[1]
Question 7
7(a)[2]
7(b)(i)[1]
7(b)(ii)[2]
7(c)(i)[1]
7(c)(ii)[2]
7(d)(i)[1]
7(d)(ii)[1]
Question 8
8(a)[1]
8(b)[2]
8(c)[2]
8(d)[1]
8(e)[1]
8(f)(i)[2]
8(f)(ii)[1]
Question 9
9(a)[2]
9(b)[1]
9(c)[2]
9(d)[3]
9(e)[2]