abc Mark Scheme Chemistry 5421 General Certificate of Education Foundation Physical and Inorganic Chemistry 2009 examination - January series
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1 Version. abc General Certificate of Education Chemistry 542 CHM2 Foundation Physical and Inorganic Chemistry Mark Scheme 2009 examination - January series
2 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 candidates responses 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 candidates scripts: 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 candidates reactions to a particular paper. Assumptions about future mark schemes on the basis of one year s 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: Copyright 2009 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 ) and a registered charity (registered charity number ). Registered address: AQA, Devas Street, Manchester M5 6EX Dr Michael Cresswell Director General
3 (a) X on the time axis under the H of H2O; (b) System at equilibrium opposes any change made to it; (c) None; (d) (i) Same number of moles/molecules/particles on each side; Increase rate; If this is wrong lose both marks in this section. Not atoms If this is wrong lose both marks in this section More particles/collisions have E>Ea; Allow sufficient/enough energy. Not more frequent/ forceful collisions or Ea lower. (d) (ii) Increase; Finds an alternative route/ correct orientation/ surface to react on; If this is wrong lose all marks in this section Lower activation energy; (d) (iii) Exothermic/negative/-ve /heat (energy) given out; (e) Increase; Opposes the change; If this is wrong lose all marks in this section Moves to right/replace CO2; Allow favours forward reaction 3
4 2 (a) (i) Al 2O3; 2 (a) (ii) Ions move 2 (a) (iii) Lowers temp /mp bauxite too high; Must be temp related, not energy. 2 (a) (iv) Al3+ + 3e - Al; 2O 2- O2 + 4e - ; 2 (b) Conserves bauxite/ prevents mining / prevents landfill/ prevents eyesore on landscapes / saves energy or electricity / cost of purifying bauxite too high /reduces greenhouse gases; 2 (c) (i) Fe 2O3 + 3CO 2Fe + 3CO2; 2 max Any 2 High temp/500 C/ accept temp in range C; Do not allow hot air 2 (c) (ii) Reducing agent/reductant/electron donor; 2 (c) (iii) CO is a gas whereas C is a solid; QWC Allow correct energy explanation. 4
5 3 (a) Heat (energy) change/required/needed; At constant/fixed pressure; Lose 2nd mark if standard or a specified pressure. 3 (b) C(s) + 2S (s) CS2(l); 2 Accept ¼ S8 (not S2). mark for equation and mark for state symbols. Conseq on first mark. 3 (c) -076 = ΔHf products - ΔHf reactants; -076 = (-297 2) - ΔHf(CS2) -076 = ΔHf(CS2) ΔHf(CS2) = ; -88 mark = 88 kjmol - ; 3 (d) (i) Q = mcδt; = = 2520 J; Moles = 0.45/76.2 = ; Ignore units even if incorrect. Last mark must show the minus sign and the correct answer. Penalise wrong units. 3 (d) (ii) Molar heat change = 2520 / = -427 (kj or kj mol - ); Heat loss / incomplete combustion; Accept range
6 4 (a) Gain of electrons; Penalise pairs in both parts. Donates/ gives / loses electrons; 4 (b) (+)5; (+)4; -3; 4 (c) (i) 4H 2O + S H2SO4 + 6H + + 6e - ; 4 (c) (ii) e- + H + + HNO3 NO2 + H2O; 4 (c) (iii) 6HNO 3 + S H2SO4 + 6NO2 + 2H2O; Allow uncancelled H + or H2O 4 (c) (iv) Reducing agent/reductant/electron donor; 6
7 5 (a) Cl2 + H2O HCl + HClO; Ionic allowed Green colour = Chlorine/Cl2; Ul goes red/pink; Not orange. With acid/h + ; And white / loses colour / bleach; Due to/because of HClO / ClO - or names; QWC mark here for reason following bleaching etc. 5 (b) Brown solution/ black ppt or solid; Cl2 + 2Kl l2 + 2KCl; Not yellow or orange alone. Anything purple loses st mark. Ionic allowed. 5 (c) Ag NO3 or correct name; Needed for next 3 marks. KCl gives white ppt/solid; KF gives colourless solution/no reaction/no change/no ppt; Ag NO3 + KCl AgCl + KNO3 / Ag + + Cl - AgCl 5 (d) Sulphur dioxide/so2; H2SO4 + 2H + + 2Br - SO2 + Br2 + 2H2O; OR 2KBr + H2SO4 + 2H + 2K + + Br2 + SO2 +2H2O and other balanced equation; 2 Lose mark if other product(s) given. mark for having Br2 as a product mark for any balanced equation Not KOH or K2O 7
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