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Cambridge International General Certificate of Secondary Education 0620 Chemistry November 2014

Principal Examiner Report for Teachers

CHEMISTRY

Paper 0620/11 Multiple Choice

Question Number

Key

1

D

2

A

3

D

4

A

5

B

6

A

7

C

8

C

9

D

10

D

11

D

12

A

13

C

14

C

15

B

16

B

17

B

18

D

19

B

20

A

Question Number

Key

21

B

22

B

23

B

24

B

25

A

26

D

27

D

28

D

29

A

30

B

31

C

32

B

33

D

34

A

35

A

36

D

37

A

38

C

39

B

40

B

Candidates performed well on this paper. Questions 1, 3, 5, 9, 10, 15, 19, 22, 27 and 30 proved to be the most straightforward with a high proportion of candidates selecting the correct response.

Questions 13, 20, 21, 23, 25, 32 and 36 were the most difficult for candidates.

The following were common incorrect responses to the questions listed:

Question 13

Response A. Candidates did not read the alternative statement (2) carefully and so thought it to be correct.

Question 20

Response B. Candidates correctly selected elements "W" and "X" but did not identify that "Y" would also form a basic oxide because it is a transition metal.

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Question 21

Cambridge International General Certificate of Secondary Education 0620 Chemistry November 2014

Principal Examiner Report for Teachers

Response D. Candidates did not realise that copper would not react with the two acids.

Question 23

Response D. Candidates did not identify that hydroxides, not oxides, are formed when Group I metals react with water.

Question 25

Response C. Candidates correctly identified the structure of an inert gas but did not realise that the question specifically referred to helium.

Question 32

Responses A, C and D. This question was not well answered and all responses had a significant number of candidates opting for them.

Question 36

Response C. The difference between ethane and ethene was not taken into account correctly.

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Cambridge International General Certificate of Secondary Education 0620 Chemistry November 2014

Principal Examiner Report for Teachers

CHEMISTRY

Paper 0620/12 Multiple Choice

Question Number

Key

1

D

2

D

3

A

4

A

5

A

6

C

7

C

8

B

9

D

10

D

11

A

12

D

13

C

14

C

15

B

16

B

17

D

18

B

19

B

20

A

Question Number

Key

21

B

22

B

23

B

24

D

25

A

26

B

27

A

28

D

29

D

30

C

31

B

32

B

33

A

34

A

35

D

36

A

37

D

38

B

39

C

40

B

Candidates performed very well on this paper. Questions 1, 2, 4, 6, 7, 8, 9, 12, 16, 18, 23, 28, 35, 36, 38 and 40 proved to be the most straightforward with a high proportion of candidates selecting the correct response.

Questions 3, 11, 20, 21, 24, 25, 27, 32, 33 and 37 were the most difficult for candidates.

The following were common incorrect responses to the questions listed:

Question 3

Response B. Candidates were perhaps misled by the related practical task involving the separation of sodium chloride and sand.

Question 11

Response C. Candidates selected the correct products for the electrolysis of molten sodium chloride.

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Question 20

Cambridge International General Certificate of Secondary Education 0620 Chemistry November 2014

Principal Examiner Report for Teachers

Response B. Candidates correctly selected elements "W" and "X" but did not identify that "Y" would also form a basic oxide because it is a transition metal.

Question 21

Response D. Candidates did not realise that copper would not react with the two acids.

Question 24

Response B. Candidates did not put "vigorously" and "violently" in the correct order.

Question 25

Response C. Candidates correctly identified the structure of an inert gas but did not realise that the question specifically referred to helium.

Question 27

Response B. Candidates selected their response from the information in the first part of the question only.

Question 32

Responses A, C and D. This question was not well answered and all responses had a significant number of candidates opting for them.

Question 33

Response D. Candidates did not realise than sulfur dioxide causes respiratory problems.

Question 37

Response C. The difference between ethane and ethene was not taken into account correctly.

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Cambridge International General Certificate of Secondary Education 0620 Chemistry November 2014

Principal Examiner Report for Teachers

CHEMISTRY

Paper 0620/13 Multiple Choice

Question Number

Key

1

D

2

C

3

D

4

D

5

B

6

A

7

C

8

B

9

B

10

D

11

D

12

A

13

D

14

C

15

D

16

B

17

B

18

D

19

B

20

C

Question Number

Key

21

C

22

B

23

B

24

B

25

A

26

A

27

D

28

D

29

B

30

B

31

C

32

A

33

D

34

A

35

C

36

D

37

D

38

B

39

B

40

C

Candidates performed very well on this paper. Questions 1, 2, 4, 5, 9, 13, 14, 18, 22, 27, 30, 31, 33, 37 and 40 proved to be the most straightforward with a high proportion of candidates selecting the correct response. Questions 8, 12, 15, 19, 23, 25, 35, 36 and 38 were the most difficult for candidates. The following were common incorrect responses to the questions listed: Question 8 Response D. Candidates did not know the meaning of the word "volatility". Question 12 Response B. Candidates selected aqueous sodium chloride instead of molten (liquid) sodium chloride.

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