CHEMISTRY - Papacambridge

[Pages:54]Cambridge International General Certificate of Secondary Education 0620 Chemistry November 2010

Principal Examiner Report for Teachers

CHEMISTRY

Paper 0620/11 Multiple Choice



Question Number

Key

1

D

2

B

3

A

4

C

5

D

6

B

7

B

8

D

9

D

10

B

11

D

12

B

13

B

14

B

15

D

16

A

17

B

18

D

19

C

20

B

Question Number

Key

21

C

22

D

23

A

24

A

25

B

26

A

27

D

28

C

29

C

30

A

31

A

32

A

33

D

34

B

35

B

36

A

37

B

38

B

39

C

40

D

General comments Candidates performed quite well on this paper. Questions 2, 9, 10, 28 and 32 proved particularly straightforward with more than 90% of candidates choosing the correct response. Questions 17, 29 and 30 proved to be difficult with less than 40% of candidates choosing the correct response.

Comments on Specific Questions The following responses were popular wrong answers to the questions listed.

1

? UCLES 2010

Question 11

Cambridge International General Certificate of Secondary Education 0620 Chemistry November 2010

Principal Examiner Report for Teachers

Response C. Candidates related the diagram to an experiment that they had done instead of considering the polarity of the battery.

Question 12

Response A. Candidates knew the correct substances and hastily selected A without considering the correct electrodes.

Question 13

Response A. Chlorine is coloured but sodium is not produced. Candidates needed to read all possible responses then they may have selected the correct one.

Question 17

Response A. This response was more popular than B (the correct response). Candidates knew the correct colour change and either did not read further or confused exothermic and endothermic.

Question 19

Response B. Candidates realised that positive tests for iodide and sulfate were involved but got them the wrong way round.

Question 23

Response C. A significant number chose this alternative. Group I metals are good conductors even if they are not used as such.

Question 30

Response B. This answer was more popular than the correct one. Candidates knew that carbon monoxide was involved in iron production and did not realise that this question involved the conversion of iron to steel.

Question 33

Response C. Candidates did not realise that lead compounds are a fuel additive and therefore constitute part of the fuel.

Question 39

Response B. Candidates knew that ethanol contained an oxygen atom but did not know of the reaction involved in the question.

Question 40

Response B. Candidates knew that bitumen was at the bottom of the tower and did not read to the end of the alternatives.

2

? UCLES 2010

Cambridge International General Certificate of Secondary Education 0620 Chemistry November 2010

Principal Examiner Report for Teachers

CHEMISTRY

Paper 0620/12 Multiple Choice

Question Number

Key

1

D

2

A

3

B

4

D

5

B

6

D

7

B

8

B

9

D

10

C

11

B

12

D

13

B

14

A

15

C

16

B

17

D

18

B

19

B

20

D

Question Number

Key

21

A

22

A

23

D

24

C

25

A

26

B

27

C

28

D

29

A

30

C

31

D

32

A

33

A

34

A

35

B

36

B

37

D

38

C

39

B

40

B

General comments Candidates performed quite well on this paper. Questions 2, 4, 5, 10, 30, 32, 33 and 40 proved particularly straightforward with more than 90% of candidates choosing the correct response. Questions 16 and 30 proved to be difficult with less than 40% of candidates choosing the correct response.

Comments on Specific Questions The following responses were popular wrong answers to the questions listed.

3

? UCLES 2010

Question 11

Cambridge International General Certificate of Secondary Education 0620 Chemistry November 2010

Principal Examiner Report for Teachers

Response C. Chlorine is coloured but sodium is not produced. Candidates needed to read all possible responses then they may have selected the correct one.

Question 15

Response B. Candidates realised that positive tests for iodide and sulfate were involved but got them the wrong way round.

Question 16

Response A. This response was more popular than B (the correct response). Candidates knew the correct colour change and either did not read further or confused exothermic and endothermic.

Question 29

Response B. This answer was more popular than the correct one. Candidates knew that carbon monoxide was involved in iron production and did not realise that this question involved the conversion of iron to steel.

Question 31

Response C. Candidates did not realise that lead compounds are a fuel additive and therefore constitute part of the fuel.

Question 37

Response B. Candidates knew that bitumen was at the bottom of the tower and did not read to the end of the alternatives.

4

? UCLES 2010

Cambridge International General Certificate of Secondary Education 0620 Chemistry November 2010

Principal Examiner Report for Teachers

CHEMISTRY

Paper 0620/13 Multiple Choice

Question Number

Key

1

D

2

D

3

C

4

A

5

B

6

D

7

B

8

B

9

D

10

B

11

B

12

D

13

B

14

A

15

B

16

D

17

B

18

B

19

D

20

C

Question Number

Key

21

A

22

A

23

D

24

C

25

B

26

A

27

D

28

A

29

C

30

D

31

C

32

A

33

A

34

A

35

B

36

B

37

C

38

D

39

B

40

B

General comments Candidates performed quite well on this paper. Questions 1, 2, 3, 4, 5, 6, 8, 29, 32, 33 and 40 proved particularly straightforward with more than 90% of candidates choosing the correct response. Questions 18 and 28 proved to be difficult with less than 40% of candidates choosing the correct response. Comments on Specific Questions The following responses were popular wrong answers to the questions listed.

5

? UCLES 2010

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