Chemistry · 2002 · November · Paper 3 · SL · Markscheme

MARKSCHEME November 2002 CHEMISTRY Standard Level Paper 3 11 pages N02/420/S(3)M+ INTERNATIONAL BACCALAUREATE BACCALAURÉAT INTERNATIONAL BACHILLERATO INTERNACIONALc Subject Details: Chemistry SL Paper 3 Markscheme General y Each marking point is usually shown on a separate line or lines. y Alternative answers are separated by a slash (/) – this means that either answer is acceptable. y Words underlined are essential for the mark. y Material in brackets ( … ) is not needed for the mark. y The order in which candidates score marks does not matter (unless stated otherwise). y The use of OWTTE in a markscheme (the abbreviation for “or words to that effect”) means that if a candidate’s answer contains wo rds different to those in th e markscheme, but which can be interpreted as having the same meaning, then the mark should be awarded. y Please remember that many ca ndidates are writing in a second language, and that effective communication is more important than grammatical accuracy. y 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. y In some questions an answer to a que stion part has to be used in later parts. If an error is made in the first part then it should be pena lised. However, if the incorrect an swer 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. y 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, pena lise the omission of units, or the use of incorrect units, once only in the paper, and show this by writing −1(U) at the first point at which it occurs. y Do not penalise candidates for usin g too many significant figures in answers to calculations,