Page 421 - SUBSEC October 2017_Neat

02112032/CAPE/SPEC/MS/2017
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CHEMISTRY
UNIT 1 — PAPER 032
MARK SCHEME
KC UK XS
Question 2

S.O.: Module: 2 ----1.4 – 1.6

(i)

Expt. # Volume of Acid Volume of Time
3
3
(cm ) water (cm ) (seconds)

1 9.8 40.2 85
11.4 38.6 55
2
16.2 33.8 29
3
5
4 22.5 27.5 16
5 30.3 19.7 8
6 42.1 7.9 4

Table headings = 1 mark
4 or more rows correct = 4 marks
3 rows correct = 3 marks
2 rows correct = 2 marks
1 row correct = 1 mark
[Total 5 marks]

(ii) Axes correct = 2 marks
Shape of graph = 1 mark
4-6 points correct = 2 marks
<4 points correct = 1 mark 5
[Total 5 marks]

(iii) As the volume of acid increases the reaction time
increases. Any other reasonable expression. 2
[2 marks]

(iv) Use the candidates’ graphs to determine rate of
reaction at 10, 20, and 30 seconds. 3
[1 mark each = 3 marks]

5 10
Total 15 marks