Page 47 - Spotlight A+ Form 4 & 5 Chemistry KSSM

32. Figure 11 shows a voltaic cell. 35. Figure 13 shows a series of tests carried out on
solution J.
V
Solution NaOH Green
J precipitate
Magnesium, Silver, Ag plate
Mg plate
Nitric acid, HNO followed with
3
silver nitrate, AgNO solution
Sodium chloride, 3
NaCl solution
Figure 11 White
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Which half equations represent the reactions at precipitate
the positive terminal and the negative terminal of
the cell? Figure 13

Positive terminal Negative terminal Which of the following is most likely to be
+
A 2H + 2e → H Ag → Ag + e − solution J?
−
+
2 A Iron(II) sulphate, FeSO 4
B Ag + e → Ag Mg → Mg + 2e − B Lead(II) sulphate, PbSO 4
2+
−
+
2+
−
+
C 2H + e → H 2 Mg → Mg + 2e − C Iron(II) chloride, FeCl 2
D 4OH → O + 2H O D Iron(II) iodide, Fel 2
−
Na + e → Na 2 2
+
−
+ 4e − 36. Figure 14 shows the results of an experiment to
determine the heat of combustion of butanol,
33. Figure 12 shows the conversion of ethene, C H , C H OH.
2
4
into ethanoic acid, CH COOH and eventually 4 9
3
compound Y. Wind shield Thermometer
Process X Oxidation
Copper can
Ethene, Ethanol, Compound SPM MODEL PAPER
3
C H C H OH Y Water (250 cm )
2 4 2 5
Figure 12 Spirit lamp
Which of the following is process X and Butanol, C H OH
4
9
compound Y? Wooden block
Process X Compound Y Figure 14
A Ethanoic acid,
Hydration 1.11 g of butanol, C H OH is completely burnt to
4
4
CH COOH heat the water from 25 ºC to T ºC. Determine the
3
B Ethanoic acid, T ºC.
Esterification
CH COOH [Specific heat capacity of water: 4.2 J g ºC ;
–1
–1
3
C Ethyl ethanoate, relative molecular mass of butanol: 74; heat of
Addition combustion of butanol: – 2 450 kJ mol ]
–1
CH COOC H
3 2 5 A 60.0 °C
D Ethyl ethanoate,
Oxidation B 42.0 °C
CH COOC H
3 2 5 C 35.0 °C
34. The following equation represents a combustion D 30.0 °C
of methane, CH . 37. The following statements describe the properties
4
of particles of a substance at room temperature.
CH (g) + 2O (g) → CO (g) + 2H O(l)
2
2
4
2
What is the mass of products formed when 5.6 g • The arrangement of the particles is not in
the orderly manner.
of methane is burnt completely? • The particles vibrate, rotate and move to
[Relative atomic mass: H=1; C=12; O=16] the whole region.
A 5.6 g • The particles always collide with each
B 12.6 g other.
C 15.4 g
D 28.0 g
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