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Page 1 of 4 Mark Scheme Syllabus Paper
IGCSE Examinations – November 2001 0620 3
An orrectly written symbol, e.g. NA or CL, should be penalised once in a question.
In the mark scheme if a word or phrase is underlined, it (or equivalent) is required for the award
of the mark.
( ) is used to denote material that is not specifically required.
OR designates alternative and t ways of gaining the marks for the question.
or indicates different ways of gaining the same mark.
COND indicates that the award of this mark is conditional upon a previous mark being gained.
Unusual responses, which lude correct Chemistry that answers the question, should always
be rewarded - even if they are not mentioned in the marking scheme.
All the candidate’s work must show evidence of being marked by the examiner.
1 (a) (i) plete combustion or oxidation [1]
carbon [1]
or fuel
or named fuel that could be used in a vehicle - petrol, etc.
(ii) (carbon monoxide) reacts with oxide of nitrogen [1]
to form carbon dioxide or complete combustion [1]
OR equation of type below for both marks
2NO + 2CO 2CO2 + N2
OR forms carbon dioxide
or uses carbon monoxide faster
(iii) reduction [1]
COND electron gain or decrease in oxidation number [
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