0620 W11 Ms 61
UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS
International General Certificate of Secondary Education
MARK SCHEME for the October/November 2011 question paper for the guidance of teachers
0620 CHEMISTRY
0620/61
Paper 6 (Alternative to Practical), maximum raw mark 60
This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. It shows the basis on which Examiners were instructed to award marks. It does not indicate the details of the discussions that took place at an Examiners’ meeting before marking began, which would have considered the acceptability of alternative answers.
Mark schemes must be read in conjunction with the question papers and the report on the examination. • Cambridge will not enter into discussions or correspondence in connection with these mark schemes.
Cambridge is publishing the mark schemes for the October/November 2011 question papers for most
IGCSE, GCE Advanced Level and Advanced Subsidiary Level syllabuses and some Ordinary Level syllabuses. Page 2
1
Mark Scheme: Teachers’ version
IGCSE – October/November 2011
Syllabus
0620
Paper
61
(a) (i) (gas) syringe (1)
(ii) arrow indication under copper (1)
2
[1]
(b) spatula (1)
[1]
(c) black (1)
[1]
(d) to return to room/initial temperature (1) correct volume of gas (1)
[2]
(a) points plotted correctly (2) smooth line graph missing anomalous point (1)
[3]
(b) point at 15 cm3/pH 2.6/third point (1)
[1]
(c) (i) 12.6 (1)
[1]
(ii) pH 1 (1) extrapolation shown (1)
(d) (i) 7 (1)
[2]
[1]
(ii) 25 (1)
[1]
(e) repeat experiment (1) stop when 25 cm3 added/when pH7 (1) evaporate/heat (1) use same volumes (1) to crystallising point/until saturated (1)
3
[1]
max [3]
(a) chromatography (1)
[1]
(b) line drawn on diagram below origin (1)
[1]
(c) does not interfere with results/owtte (1)
[1]
(d) difference
A has more/3 colours/B has less/2 colours/B contains F but A doesn’t/A contains C/
D but B does not (1)
International General Certificate of Secondary Education
MARK SCHEME for the October/November 2011 question paper for the guidance of teachers
0620 CHEMISTRY
0620/61
Paper 6 (Alternative to Practical), maximum raw mark 60
This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. It shows the basis on which Examiners were instructed to award marks. It does not indicate the details of the discussions that took place at an Examiners’ meeting before marking began, which would have considered the acceptability of alternative answers.
Mark schemes must be read in conjunction with the question papers and the report on the examination. • Cambridge will not enter into discussions or correspondence in connection with these mark schemes.
Cambridge is publishing the mark schemes for the October/November 2011 question papers for most
IGCSE, GCE Advanced Level and Advanced Subsidiary Level syllabuses and some Ordinary Level syllabuses. Page 2
1
Mark Scheme: Teachers’ version
IGCSE – October/November 2011
Syllabus
0620
Paper
61
(a) (i) (gas) syringe (1)
(ii) arrow indication under copper (1)
2
[1]
(b) spatula (1)
[1]
(c) black (1)
[1]
(d) to return to room/initial temperature (1) correct volume of gas (1)
[2]
(a) points plotted correctly (2) smooth line graph missing anomalous point (1)
[3]
(b) point at 15 cm3/pH 2.6/third point (1)
[1]
(c) (i) 12.6 (1)
[1]
(ii) pH 1 (1) extrapolation shown (1)
(d) (i) 7 (1)
[2]
[1]
(ii) 25 (1)
[1]
(e) repeat experiment (1) stop when 25 cm3 added/when pH7 (1) evaporate/heat (1) use same volumes (1) to crystallising point/until saturated (1)
3
[1]
max [3]
(a) chromatography (1)
[1]
(b) line drawn on diagram below origin (1)
[1]
(c) does not interfere with results/owtte (1)
[1]
(d) difference
A has more/3 colours/B has less/2 colours/B contains F but A doesn’t/A contains C/
D but B does not (1)