GCSE Science June 2007 Chemistry 1A Paper Ans Key

Version1.2:15/08/07 abc GCSE Science A 4461 Chemistry 4421 CHY1A F & H Mark Scheme 2007 examination - June series Mark schemes are prepared by the Principal Examiner and considered, together with the relevant questions, by a panel of subject teachers. This mark scheme includes any amendments made at the standardisation meeting attended by all examiners and is the scheme which was used by them in this examination. The standardisation meeting ensures that the mark scheme covers the candidatesresponses to questions and that every examiner understands and applies it in the same correct way. As preparation for the standardisation meeting each examiner analyses a number of candidatesscripts: alternative answers not already covered by the mark scheme are discussed at the meeting and legislated for. If, after this meeting, examiners encounter unusual answers which have not been discussed at the meeting they are required to refer these to the Principal Examiner. It must be stressed that a mark scheme is a working document, in many cases further developed and expanded on the basis of candidatesreactions to a particular paper. Assumptions about future mark schemes on the basis of one years document should be avoided; whilst the guiding principles of assessment remain constant, details will change, depending on the content of a particular examination paper. Further copies of this Mark Scheme are available to download from the AQA Website: www.aqa.org.uk Copyright © 2007 AQA and its licensors. All rights reserved. COPYRIGHT AQA retains the copyright on all its publications. However, registered centres for AQA are permitted to copy material from this booklet for their own internal use, with the following important exception: AQA cannot give permission to centres to photocopy any material that is acknowledged to a third party even for internal use within the centre. Set and published by the Assessment and Qualifications Alliance. The Assessment and Qualifications Alliance (AQA) is a company limited by guarantee registered in England and Wales (company number 3644723) and a registered charity (registered charity number 1073334). Registered address: AQA, Devas Street, Manchester M15 6EX Dr Michael Cresswell Director GeneralScience A 4461/Chemistry 4421 -AQA GCSE Mark Scheme 2007 June series 3 CHY1A (Products from Rocks) Foundation Tier Question Key One A atom 3 B compound 2 C element 4 D symbol 1 Two A gold (Au) 3 B lithium (Li) 4 C calcium (Ca) 1 D sulfur (S) 2 Three A a bond 3 B an electron 2 C a molecule 4 D a nucleus 1 Four A Aluminium 2 B Iron 3 C Mercury 1 D Potassium 4 Five A one 2 B four 3 C five 1 D seven 4 Six A hard 3 B resistant to corrosion 4 C easily shaped 2 D brittle 1 A B C D Seven 2 4 3 2 Eight 1 2 2 3 Nine 1 2 4 3 Science A 4461/Chemistry 4421 -AQA GCSE Mark Scheme 2007 June series 4 CHY1A (Products from Rocks) Higher Tier Question Key One A hard 3 B resistant to corrosion 4 C easily shaped 2 D brittle 1 Two A an alloy 4 B an element 1 C a hydrocarbon 2 D a mixture of compounds 3 A B C D Three 1 2 2 3 Four 1 2 4 3 Five 3 2 1 1 Six 4 4 3 3 Seven 3 2 3 3 Eight 1 3 2 3 Nine 2 3 2 3