Chemistry HL paper 2 TZ1ms

Chemistry HL paper 2 TZ1ms - M09/4/CHEMI/HP2/ENG/TZ1/XX/M+...

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Unformatted text preview: M09/4/CHEMI/HP2/ENG/TZ1/XX/M+ 17 pages MARKSCHEME May 2009 CHEMISTRY Higher Level Paper 2 2 M09/4/CHEMI/HP2/ENG/TZ1/XX/M+ This markscheme is confidential and for the exclusive use of examiners in this examination session. It is the property of the International Baccalaureate and must not be reproduced or distributed to any other person without the authorization of IB Cardiff. 5 M09/4/CHEMI/HP2/ENG/TZ1/XX/M+ Subject Details: Chemistry HL Paper 2 Markscheme Mark Allocation Candidates are required to answer ALL questions in Section A [40 marks] and TWO question in Section B [2 % 25 marks] . Maximum total = [90 marks] . 1. A markscheme often has more marking points than the total allows. This is intentional. Do not award more than the maximum marks allowed for part of a question. 2. Each marking point has a separate line and the end is signified by means of a semicolon (;). 3. An alternative answer or wording is indicated in the markscheme by a slash (/) either wording can be accepted. 4. Words in brackets ( ) in the markscheme are not necessary to gain the mark. 5. Words that are underlined are essential for the mark. 6. The order of marking points does not have to be as in the markscheme, unless stated otherwise. 7. If the candidates answer has the same meaning or can be clearly interpreted as being of equivalent significance, detail and validity as that in the markscheme then award the mark. Where this point is considered to be particularly relevant in a question it is emphasized by writing OWTTE (or words to that effect). 8. Remember that many candidates are writing in a second language. Effective communication is more important than grammatical accuracy. 9. Occasionally, a part of a question may require an answer that is required for subsequent marking points. If an error is made in the first marking point then it should be penalized. However, if the incorrect answer is used correctly in subsequent marking points then follow through marks should be awarded. Indicate this with ECF (error carried forward). 10. Only consider units at the end of a calculation. Unless directed otherwise in the markscheme, unit errors should only be penalized once in the paper. Indicate this by writing 1(U) at the first point it occurs and U on the cover page. 11. Significant digits should only be considered in the final answer. Deduct 1 mark in the paper for an error of 2 or more digits unless directed otherwise in the markscheme. e.g. if the answer is 1.63: 2 reject 1.6 accept 1.63 accept 1.631 accept 1.6314 reject Indicate the mark deduction by writing 1(SD) at the first point it occurs and SD on the cover sheet. 12. If a question specifically asks for the name of a substance, do not award a mark for a correct formula, similarly, if the formula is specifically asked for, do not award a mark for a correct name....
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This note was uploaded on 09/04/2011 for the course CHEM 101 taught by Professor N/a during the Spring '11 term at Ohlone.

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Chemistry HL paper 2 TZ1ms - M09/4/CHEMI/HP2/ENG/TZ1/XX/M+...

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