Markscheme Chem SL P3 02
INTERNATIONAL
BACCALAURÉAT
BACHILLERATO
c
BACCALAUREATE
INTERNATIONAL
INTERNACIONAL
MARKSCHEME
May 2002
CHEMISTRY
Standard Level
Paper 3
12 pages
M02/420/S(3)M+
–5–
Subject Details:
M02/420/S(3)M+
Chemistry SL Paper 3 Markscheme
General
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Each marking point is usually shown on a separate line or lines.
Alternative answers are separated by a slash (/) – this means that either answer is acceptable.
Words underlined are essential for the mark.
Material in brackets ( … ) is not needed for the mark.
The order in which candidates score marks does not matter (unless stated otherwise).
The use of OWTTE in a markscheme (the abbreviation for “or words to that effect”) means that if a candidate’s answer contains words different to those in the markscheme, but which can be interpreted as having the same meaning, then the mark should be awarded.
Please remember that many candidates are writing in a second language, and that effective communication is more important than grammatical accuracy.
In some cases there may be more acceptable ways of scoring marks than the total mark for the question part. In these cases, tick each correct point, and if the total number of ticks is greater than the maximum possible total then write the maximum total followed by MAX.
In some questions an answer to a question part has to be used in later parts. If an error is made in the first part then it should be penalised. However, if the incorrect answer is used correctly in later parts then “follow through” marks can be scored. Show this by writing ECF (error carried forward). This situation often occurs in calculations but may do so in other questions.
Units for quantities should always be given where appropriate. In some cases a mark is available in the markscheme for writing the correct unit. In other cases the markscheme may state that units are to be ignored. Where this is not the case, penalise the omission of units, or the use of incorrect
units,
BACCALAURÉAT
BACHILLERATO
c
BACCALAUREATE
INTERNATIONAL
INTERNACIONAL
MARKSCHEME
May 2002
CHEMISTRY
Standard Level
Paper 3
12 pages
M02/420/S(3)M+
–5–
Subject Details:
M02/420/S(3)M+
Chemistry SL Paper 3 Markscheme
General
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
Each marking point is usually shown on a separate line or lines.
Alternative answers are separated by a slash (/) – this means that either answer is acceptable.
Words underlined are essential for the mark.
Material in brackets ( … ) is not needed for the mark.
The order in which candidates score marks does not matter (unless stated otherwise).
The use of OWTTE in a markscheme (the abbreviation for “or words to that effect”) means that if a candidate’s answer contains words different to those in the markscheme, but which can be interpreted as having the same meaning, then the mark should be awarded.
Please remember that many candidates are writing in a second language, and that effective communication is more important than grammatical accuracy.
In some cases there may be more acceptable ways of scoring marks than the total mark for the question part. In these cases, tick each correct point, and if the total number of ticks is greater than the maximum possible total then write the maximum total followed by MAX.
In some questions an answer to a question part has to be used in later parts. If an error is made in the first part then it should be penalised. However, if the incorrect answer is used correctly in later parts then “follow through” marks can be scored. Show this by writing ECF (error carried forward). This situation often occurs in calculations but may do so in other questions.
Units for quantities should always be given where appropriate. In some cases a mark is available in the markscheme for writing the correct unit. In other cases the markscheme may state that units are to be ignored. Where this is not the case, penalise the omission of units, or the use of incorrect
units,