Scheme (Results) November 2009 IGCSE IGCSE Chemistry (4335) Paper F Edexcel Limited. Registered in England and Wales No. 4496750 Registered Office: One90 High Holborn, London WCV 7BH 4335_F Nov 2009 i
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S E C T I O N A a M S b M O c M Accept Alkali metals d M 2 e M Al / aluminium TOTAL 5 2 a M hydrocarbons M2 heated M3 distillation M4 top M5 condenses b M carbon dioxide Accept answers in either order. Award mark for two correct formulae. M2 water TOTAL 7 3 a i M copper ii M sodium / copper iii M iron iv M copper 3 b M cross in box 2 M2 cross in box 3 TOTAL 6 4335_F Nov 2009
4 a M white M2 colourless M3 decomposition b M ammonium chloride c i M white precipitate / solid / suspension ignore powder / crystals ii M ammonia / NH 3 TOTAL 6 5 a M (dilute) sulphuric acid water M zinc sulphate M2 + carbon dioxide (gas) M2 complete + + equation (solid) zinc carbonate zinc sulphate b M limewater M2 turns milky c M heat / increase the temperature M2 use powdered/smaller pieces(of zinc Any two for each carbonate) M3 use more concentrated (sulphuric) acid d i M carbonic (acid) ii M cross in box 2 iii M orange / yellow TOTAL 9 4335_F Nov 2009 2
6 a M limestone / calcium carbonate Either way round M2 coke / carbon M3 (hot) air M4 slag / calcium silicate Award mark for D M5 iron and E in reverse order b i M C + O 2 CO 2 ii M carbon + carbon dioxide carbon monoxide iii M loss of oxygen Accept gain of electrons c i M all formulae and CaCO 3 (s) CaO(s) + CO 2 (g) balancing correct M2 state symbols correct ii M CaSiO 3 TOTAL 7 a M (hydrated) iron(iii) oxide b M air / oxygen answers in either M2 water / moisture order c M oil / grease M2 galvanising / zinc coating Accept enamel TOTAL 5 8 a M black M2 blue Reject green b i M to neutralise/use up/react with all the acid ii M to remove the solid / copper oxide iii M to remove/evaporate (some of) the water Accept so crystals form iv M to dry the crystals / absorb water TOTAL 6 SECTION A TOTAL: 55 MARKS 4335_F Nov 2009 3
S E C T I O N B 9 a M (electron) /836 / negligible Accept value in range /2000 to /800 and 0.0005 to 0.00056 Ignore zero M2 (neutron) 0 M3 (proton) M4 (proton) + b i M (number of) protons and neutrons M2 35 ii M 8 c i M 5 ii M isotopes TOTAL 9 0 a M white M2 blue b i M fractional M2 distillation ii M different boiling points / boiling point of propanone lower than that of water iii M heat / boil M2 propanone boils/collects (first) M3 stop collecting liquid above 56 C Accept wording that indicates that water collected separately or not at all c M cross in column box 4 M2 cross in column 2 box 2 TOTAL 0 4335_F Nov 2009 4
a M loses an electron/electrons M2 Na + b M gains two electrons M2 O 2 c M sodium oxide M2 Na 2 O TOTAL 6 2 a M (bromine) liquid M2 grey / black b i M any indication of chlorine in left hand tube ii M hydrogen / H 2 iii M brine / sodium chloride solution / NaCl(aq) Accept concentrated/saturated NaCl Ignore sea water c i M chlorine + sodium bromide M reagents 2 M2 bromine + sodium chloride M2 products ii M displacement / redox Accept reduction / oxidation Ignore substitution iii M (chlorine) more reactive (than bromine) TOTAL 9 4335_F Nov 2009 5
3 a M double bond / C=C / not all bonds are single b M contains bromine / another element/atom does not contain only carbon and hydrogen c M B and E d M A and B / A and E / C and F e M alkane(s) M2 C n H 2n+2 Accept other symbols such as x f M yellow / orange / brown M2 colourless / decolorised Ignore clear If only colourless stated, assume it is final colour g i M F ii M poly(ethene) / polyethene / polythene iii M addition TOTAL SECTION B TOTAL: 45 MARKS PAPER TOTAL: 00 MARKS 4335_F Nov 2009 6
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