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GCE CHEMESTRY MARKING SCHEME

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Question Answer Marks AO element Guidance 1 (a) (i) 1s22s22p63s2  1 AO1.1 ALLOW upper case S and P, and subscripts, e.g. …...2S23P6 (ii) (Mg) loses/transfers/donates two electrons  1 AO1.1 ALLOW Mg loses the 3s electrons provided electronic configuration in (a)(i) is 3S 2 ALLOW Mg  Mg2+ + 2e– IGNORE reference to oxidation numbers / states (b) (i) Sr+ (g)  Sr2+(g) + e–  1 AO2.5 ALLOW Sr+ (g) – e –  Sr2+(g) ALLOW e for electron (i.e. charge omitted) IGNORE states on the electron H032/02 7 (ii) Atomic radius larger atomic radius OR more shells  Effect of nuclear charge/shielding Increased nuclear charge outweighed by increased distance/shielding OR more/increased shielding  Nuclear attraction less nuclear attraction OR less attraction on electrons  3 AO1.2 ×3 FULL ANNOTATIONS MUST BE USED ----------------------------------------------------------- ALLOW ORA: comparison needed for each mark. ALLOW ‘more/higher energy levels’ ALLOW ‘electrons further from nucleus’ ALLOW ‘extra/new shell’ IGNORE more orbitals OR more sub-shells OR different shell ALLOW more electron repulsion from inner shells IGNORE responses with no comparison IGNORE nuclear charge/effective nuclear charge ALLOW ‘less nuclear pull’ OR ‘electrons held less tightly’ H032/02 8 Mark schemes June 2016 Question Answer Marks AO element Guidance H032/02 9 (c) (i) Diagram of labelled reaction vessel for reaction  Labelled (gas) syringe OR diagram of gas collection over water in a labelled measuring cylinder / inverted burette. AND closed system with a tube connecting reaction vessel to gas collection apparatus  1 1 AO3.3 × 2 ALLOW (conical) flask, test-tube or boiling tube. DO NOT ALLOW volumetric flask, beaker, measuring cylinder DO NOT ALLOW delivery tube below reacting solution ALLOW any of these diagrams. ALLOW a single line for the tube IGNORE Sealed end of delivery tube Mark schemes June 2016 DO NOT ALLOW measuring tube

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GCE
Chemistry A

Unit H032/02: Depth in Chemistry

Advanced Subsidiary GCE


Mark Scheme for June 2016

,Oxford Cambridge and RSA Examinations



OCR (Oxford Cambridge and RSA) is a leading UK awarding body, providing a wide range of
qualifications to meet the needs of candidates of all ages and abilities. OCR qualifications
include AS/A Levels, Diplomas, GCSEs, Cambridge Nationals, Cambridge Technicals,
Functional Skills, Key Skills, Entry Level qualifications, NVQs and vocational qualifications in
areas such as IT, business, languages, teaching/training, administration and secretarial skills.

It is also responsible for developing new specifications to meet national requirements and the
needs of students and teachers. OCR is a not-for-profit organisation; any surplus made is
invested back into the establishment to help towards the development of qualifications and
support, which keep pace with the changing needs of today’s society.

This mark scheme is published as an aid to teachers and students, to indicate the requirements
of the examination. It shows the basis on which marks were awarded by examiners. It does not
indicate the details of the discussions which took place at an examiners’ meeting before marking
commenced.

All examiners are instructed that alternative correct answers and unexpected approaches in
candidates’ scripts must be given marks that fairly reflect the relevant knowledge and skills
demonstrated.

Mark schemes should be read in conjunction with the published question papers and the report
on the examination.

OCR will not enter into any discussion or correspondence in connection with this mark scheme.

© OCR 2016

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