Generic marking principle 2 marks awarded are always

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GENERIC MARKING PRINCIPLE 2: Marks awarded are always whole marks (not half marks, or other fractions). GENERIC MARKING PRINCIPLE 3: Marks must be awarded positively : marks are awarded for correct/valid answers, as defined in the mark scheme. However, credit is given for valid answers which go beyond the scope of the syllabus and mark scheme, referring to your Team Leader as appropriate marks are awarded when candidates clearly demonstrate what they know and can do marks are not deducted for errors marks are not deducted for omissions answers should only be judged on the quality of spelling, punctuation and grammar when these features are specifically assessed by the question as indicated by the mark scheme. The meaning, however, should be unambiguous. GENERIC MARKING PRINCIPLE 4: Rules must be applied consistently e.g. in situations where candidates have not followed instructions or in the application of generic level descriptors.
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9701/22 Cambridge International AS/A Level – Mark Scheme PUBLISHED October/November 2019 © UCLES 2019 Page 3 of 10 GENERIC MARKING PRINCIPLE 5: Marks should be awarded using the full range of marks defined in the mark scheme for the question (however; the use of the full mark range may be limited according to the quality of the candidate responses seen). GENERIC MARKING PRINCIPLE 6: Marks awarded are based solely on the requirements as defined in the mark scheme. Marks should not be awarded with grade thresholds or grade descriptors in mind.
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9701/22 Cambridge International AS/A Level – Mark Scheme PUBLISHED October/November 2019 © UCLES 2019 Page 4 of 10 Question Answer Marks 1(a)(i) 1 1(a)(ii) Si(g) Si + (g) + e 1 1(a)(iii) M1: similar shielding AND increase in proton number / atomic number / nuclear charge M2: increased nuclear attraction 2 1(a)(iv) M1: 3 OR 13 M2: large(r) increase between third and fourth ionisation energies OR large(r) increase after third electron removed 2 1(b)(i) M1: ( 29 ( 29 ( 29 29 30 92.2 28 Si 29 Si 30 28.09 100 + + = M2: ( x =) 6.6 OR 28.09 = 28.078 + x (where x = abundance of Si-29 ) M3: 7.8 M2 calculated correctly to one decimal place (or more) (=) 1.2% 3 1(b)(ii) M1 giant (molecule) M2 strong covalent bonds (between atoms / particles) M3 no mobile charged particles / carriers 3 1(c)(i) C 2 H 5 SH + 4 1 2 O 2 →   2CO 2 + 3H 2 O + SO 2 1
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9701/22 Cambridge International AS/A Level – Mark Scheme PUBLISHED October/November 2019 © UCLES 2019
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