Page 51 - Spotlight A+ Form 4 & 5 Chemistry KSSM

(b) Figure 8.3 shows the reactions carried out on compound K.
Heat
Compound K Black solid L + Gas M
+ Sulphuric acid, + Limewater
H SO
2 4
Blue solution Limewater
W formed turns cloudy

+ Ammonia, NH 3
solution in excess

©PAN ASIA PUBLICATIONS
Dark blue
solution formed
Figure 8.3
(i) Based on Figure 8.3, identify K, L, M and W. [4 marks]
(ii) Describe a chemical test to identify the anion present in solution W. [2 marks]

Section B

[20 marks]

Answer any one question.
9. Three sets of experiments, I, II and III are carried out to investigate the factors affecting the rate of reaction.
Table 9 shows the reactants and the conditions of the reaction involved.

Set of experiment Reactants Condition SPM MODEL PAPER
I

50 cm of 0.5 mol dm –3 Room temperature
3
hydrochloric acid, HC

Excess zinc, Zn
II

50 cm of 0.5 mol dm –3 70 ºC
3
hydrochloric acid, HCl

Excess zinc, Zn
III

50 cm of 0.5 mol dm –3 70 ºC
3
sulphuric acid, H SO
2 4
Excess zinc, Zn

Table 9

535