UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS
GCE O Level
MARK SCHEME for the November 2005 question paper
5070 CHEMISTRY
5070/02
Paper 2 (Theory)
maximum raw mark 75
This mark scheme is published as an aid to teachers and students, to indicate the requirements of the
examination. It shows the basis on which Examiners were initially instructed to award marks. It does
not indicate the details of the discussions that took place at an Examiners’ meeting before marking
began. Any substantial changes to the mark scheme that arose from these discussions will be
recorded in the published Report on the Examination.
All Examiners are instructed that alternative correct answers and unexpected approaches in
candidates’ scripts must be given marks that fairly reflect the relevant knowledge and skills
demonstrated.
Mark schemes must be read in conjunction with the question papers and the Report on the
Examination.
•
CIE will not enter into discussion or correspondence in connection with these mark schemes.
CIE is publishing the mark schemes for the November 2005 question papers for most IGCSE and
GCE Advanced Level and Advanced Subsidiary Level syllabuses and some Ordinary Level
syllabuses.
Page 1
Mark Scheme
Syllabus
Paper
GCE O Level – November 2005
5070
2
© University of Cambridge International Examinations 2005
2a
amide and ester links correctly labelled;
circle around all four atoms in each link
2
b
protein
1
c
HOOC(C6H4)COOH;
HO(CH2)2OH;
2
d
adv e.g. lighter weight (when wet)/ does not rot;
disadv e.g. made from non-renewable raw material/ is non
biodegradable
2
Total 7
3a
5.0 – 5.9/ above 5.0 below 6.0
1
b
mango
1
c
Ca(OH)2 neutralises acidity/ changes or controls soil pH;
(NH4)2SO4 contains nitrogen;
this leads to increased plant growth/ crop yield
3
d
i CaSO4;
2NH3;
2
ii
loss of N from soil occurs
1
Total 8
4a
pentanoyl chloride
1
b
propanoyl chloride
1
c