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GENERAL CERTIFICATE OF SECONDARY EDUCATION GATEWAY SCIENCE B742/02CHEMISTRY BUnit B742: Chemistry modules C4, C5, C6 (Higher Tier) MARK SCHEME Duration: 1 hour 30 minutes

MAXIMUM MARK 85

This document consists of 24 pages © OCR 2011 [QN 600/1071/X] OCR is an exempt Charity

B742/02 Mark Scheme SPECIMEN

Guidance for Examiners Additional Guidance within any mark scheme takes precedence over the following guidance. 1. Mark strictly to the mark scheme.

2. Make no deductions for wrong work after an acceptable answer unless the mark scheme says otherwise.

3. Accept any clear, unambiguous response which is correct, eg mis-spellings if phonetically correct (but check additional guidance).

4. Abbreviations, annotations and conventions used in the detailed mark scheme:

/ = alternative and acceptable answers for the same marking point (1) = separates marking points not/reject = answers which are not worthy of credit ignore = statements which are irrelevant - applies to neutral answers allow/accept = answers that can be accepted (words) = words which are not essential to gain credit words = underlined words must be present in answer to score a mark ecf = error carried forward AW/owtte = alternative wording ora = or reverse argument

eg mark scheme shows ‘work done in lifting / (change in) gravitational potential energy’ (1) work done = 0 marks work done lifting = 1 mark change in potential energy = 0 marks gravitational potential energy = 1 mark

5. If a candidate alters his/her response, examiners should accept the alteration.

6. Crossed out answers should be considered only if no other response has been made. When marking crossed out responses, accept correct answers which are clear and unambiguous.

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B742/02 Mark Scheme SPECIMEN

Assessment Objectives (AO) Grid

(includes quality of written communication )

Question AO1 AO2 AO3 Total1(a) 1 1 1(b) 1 1 1(c) 1 1 2(a) 1 1 2(b) 2 2 2(c) 1 1 3(a) 1 1 2 3(b) 2 2

3(c) 2 2 2 6 4(a) 1 1

4(b)(i) 2 2 4(b)(ii) 1 1 5(a)(i) 1 1 5(a)(ii) 1 1

5(b) 1 1 2 6 2 2

7 2 4 6 8(a) 2 2 8(b) 1 1 8(c) 1 3 4 9(a) 1 1 9(b) 1 1 10(a) 2 2 10(b) 1 1 10(c) 2 2

11 3 3 12(a) 1 1 12(b) 1 1 12(c) 2 2 13(a) 1 1 13(b) 2 2 13(c) 1 1 14(a) 1 1 14(b) 1 1 14(c) 1 1

15 1 1 2 16(a)(i) 1 1 16(a)(ii) 1 1 16(a)(iii) 2 2 16(b)(i) 1 1 16(b)(ii) 1 1

17 5 1 6 18(a) 1 1 18(b) 1 1

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B742/02 Mark Scheme SPECIMEN

Question AO1 AO2 AO3 Total18(c)(i) 2 2 18(c)(ii) 1 1

18(d) 5 5 Totals 34 35 16 85

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