GCE Chemistry CH5 1095-01
WJEC 2014 Online Exam Review GCE Chemistry CH5 1095-01 All Candidates' performance across questions
Question Title 1 2 3 4 5
N 2043 2041 2042 2042 2040
Mean 6.4 6.2 11.2 11.5 10.2
SD 2.3 3.4 4.1 4.5 4.9
Max Mark 10 12 18 20 20
FF 64 51.3 62.1 57.7 51.1
Attempt % 100 99.9 100 100 99.8
GCE Chemistry CH5 1095-01 5
51.1
Question
4
57.7
3
62.1
2
51.3
1
64 0
10
20
30
40
50
60
Facility Factor %
70
80
90
100
3c ii 4b i 5c
7 Examiner only
(c) Manganese(IV) oxide (line 10) and potassium manganate(VII) (lines 20-21) are typical transition metal compounds.
(ii) Explain why transition metal complex ions appear coloured.
© WJEC CBAC Ltd.
(1095-01)
[4] QWC [1]
Turn over.
4
4
4
10 (b) Carbon is the first element in Group 4. Two of its allotropes are diamond and graphite. A compound that forms structures corresponding to diamond and graphite is boron nitride. (i) Describe the structure of graphite and explain why hexagonal boron nitride can adopt the same structure yet have different electrical conductivity properties. [4] QWC [1]
© WJEC CBAC Ltd.
(1095-01)
4
3
5
11 (c) Most ionic chlorides, e.g. sodium chloride, are soluble in water. However some, e.g. silver 5. chloride, are insoluble. The enthalpy change of solution of an ionic compound and its solubility depend on the balance between two enthalpy changes. Name these enthalpy changes and state if they are endothermic or exothermic. Explain how the enthalpy change of solution of a compound and its solubility depend on the balance between them. [4] QWC [1]
© WJEC CBAC Ltd.
(1095-01)
Turn over.
3
3
3
Question Title 1 2 3 4 5
N 2043 2041 2042 2042 2040
Mean 6.4 6.2 11.2 11.5 10.2
SD 2.3 3.4 4.1 4.5 4.9
Max Mark 10 12 18 20 20
FF 64 51.3 62.1 57.7 51.1
Attempt % 100 99.9 100 100 99.8
GCE Chemistry CH5 1095-01 5
51.1
Question
4
57.7
3
62.1
2
51.3
1
64 0
10
20
30
40
50
60
Facility Factor %
70
80
90
100
3c ii 4b i 5c
7 Examiner only
(c) Manganese(IV) oxide (line 10) and potassium manganate(VII) (lines 20-21) are typical transition metal compounds.
(ii) Explain why transition metal complex ions appear coloured.
© WJEC CBAC Ltd.
(1095-01)
[4] QWC [1]
Turn over.
4
4
4
10 (b) Carbon is the first element in Group 4. Two of its allotropes are diamond and graphite. A compound that forms structures corresponding to diamond and graphite is boron nitride. (i) Describe the structure of graphite and explain why hexagonal boron nitride can adopt the same structure yet have different electrical conductivity properties. [4] QWC [1]
© WJEC CBAC Ltd.
(1095-01)
4
3
5
11 (c) Most ionic chlorides, e.g. sodium chloride, are soluble in water. However some, e.g. silver 5. chloride, are insoluble. The enthalpy change of solution of an ionic compound and its solubility depend on the balance between two enthalpy changes. Name these enthalpy changes and state if they are endothermic or exothermic. Explain how the enthalpy change of solution of a compound and its solubility depend on the balance between them. [4] QWC [1]
© WJEC CBAC Ltd.
(1095-01)
Turn over.
3
3
3
