Mark Scheme (Results) Summer 2016
Mark Scheme (Results)Summer 2016Pearson Edexcel International GCSEin Chemistry (4CH0) Paper 1CRPearson Edexcel International in ScienceDouble Award (4SC0) Paper 1CR
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General Marking Guidance All candidates must receive the same treatment. Examinersmust mark the first candidate in exactly the same way as theymark the last. Mark schemes should be applied positively. Candidates mustbe rewarded for what they have shown they can do rather thanpenalised for omissions. Examiners should mark according to the mark scheme notaccording to their perception of where the grade boundariesmay lie. There is no ceiling on achievement. All marks on the markscheme should be used appropriately. All the marks on the mark scheme are designed to beawarded. Examiners should always award full marks ifdeserved, i.e. if the answer matches the mark scheme.Examiners should also be prepared to award zero marks if thecandidate’s response is not worthy of credit according to themark scheme. Where some judgement is required, mark schemes will providethe principles by which marks will be awarded andexemplification may be limited. When examiners are in doubt regarding the application of themark scheme to a candidate’s response, the team leader mustbe consulted. Crossed out work should be marked UNLESS the candidate hasreplaced it with an alternative response.
Questionnumber1AnswerNotesMarksaatomic numberAccept proton numberAccept number of protons1b(relative) atomic massReject mass number1cielectrons1iielectrons1iiiprotons AND neutronsNames can be in either order1ivprotons AND electronsNames can be in either order1vneutrons1
symbolafterchangeWater boils in akettlelgEthene is converted topoly(ethene)gsCrystals of iodine sublimeon heatingsgChange of statebcNotesCaCO3(s) 2HCl(aq) CaCl2(aq) H2O(l) CO2(g)s / solidM1l AND g in first rowM2g AND s in second rowM3s AND g in third rowMarks3Accept upper case letters, eg S inplace of sAccept words, eg liquid in place of lAccept answers in bracketsAward 1 mark for s and g correctAward 1 mark for other 3 correctAccept upper caseReject words2Accept upper case S in place of s1
Questionnumber3AnswerNotesMarksaD / simple distillation1bC / fractional distillation1cB / filtration1A / crystallisation1d
Questionnumber4AnsweraCbvalue in range 120 - 250c(green)(colour)(state)deCNotesMarks1If range given, it must be wholly within120 - 250dark(er) grey / blacksolidDo not accept grey aloneReject any other colour given with blackeg blue/blackIgnore just darker than iodine12Accept correct state symbol(outer electrons)1Incorrect wordCorrect ngone mark for each correct rowAccept minor variations and alternativesand extra wordseg for negative, accept negatively /minuseg for oxidising, accept oxidation /electron acceptor /oxidatingAccept potassium bromide and sodiumbromideAccept K for potassium and Na forsodium3
Questionnumber5aiiiAnswerto prevent spots/them dissolving/mixing (in the solvent) / ) for spotsIgnore references todiffusion/absorptionIgnore references to spotssmudging/runningAccept spots would bewashed off/awayIgnore water for solvent1Any two from:M1evaporation /loss of solvent / OWTTEAccept water for solventIgnore gas escapingM2risk of fireIgnore it is flammable onlyM3fumes may be toxic/poisonousIgnore harmful/dangerousIgnore references tosubstances enteringtank/spillageIgnore references toreaction with air2
bM1cross in box A (chlorophyll is not present in carrots, sweetpotatoes or tomatoes)M2cross in box C (both beta-carotene and lycopene are present insweet potatoes)M3cross in box E (Both carrots and tomatoes contain a pigmentother than beta-carotene, chlorophyll and lycopene)cM1(distance between start line and solvent front) 6(.0)M2correct evaluation of Rf value1.3/6.0 0.22If more than three answersgiven mark on list principle:eg four answers given with3 correct and 1 incorrectscores 2 markseg all five answers given so3 correct and 2 incorrectscores 1 mark3Accept answer to 1 or moredp, eg 0.2, 0.217,Accept 0.216recurringReject 0.216correct answer with noworking scores 22M2 CQ on M1d(there is a substance in sweet potatoes that) does not dissolve/isinsoluble (in the solvent)Ignore mixIgnore water for solventReject not verysoluble/partially soluble1
Questionnumber6aAnswercovalentNotesIgnore references to polar bonding and electronsharingMarks1Accept bonds for forces for both M1 and M2Reject atoms for both M1 and M2bM1weak forces (of attraction) betweenmolecules / weak intermolecular forcesAccept particles for moleculesAccept correctly named IMF eg van der Waals'M2(therefore) little (thermal/heat) energyrequired to overcome the forces / separate themoleculesIgnore more easily separated / easier to break2if any reference to/implication of breakingcovalent or ionic bonds scores 0/2M1 and M2 indepcM1(strong) attraction between bonding/sharedpair of electronsM2(and) nuclei of (both atoms)Do not award M2 if reference to only one nucleus2ORM1M2bonding/shared pair of electrons(strongly) attracted to nuclei (of both atoms)Do not award M2 if reference to only one nucleus
dM1 for 2 electrons shared between one H and oneClM2 rest of molecule fully correctM2 DEP on M1Accept any combination of dots and crossesIgnore inner shells of electrons in chlorine2if overlapping touching/circles are used bothelectrons must be within the overlapping/touchingareasymbols do not need to be shown if overlappingtouching /circles are usedeM1(effervescence) due to hydrogen (gas)M2solution A is acidic / contains H / contains hydrochloric acidM3solution B is not acidic / does not contain H / does not contain hydrochloric acidAccept hydrogen chloride/HCl does not ionise/dissociateIf only reference to HCl ionises/dissociates allowmax one mark for M2 and M3, ie reference toeither H or acid(ic) needed to score both marksIgnore the bonds between H and Cl are notbroken (when HCl dissolved) in methylbenzeneDo not award M3 if any reference tomethylbenzene reacting or dissociating3
Questionnumber7aAnswerM1(they/all) contain hydrogen and carbon(atoms)M2onlybdouble bondcAdB and E and FNotesAccept H and CAccept particles/elements in place of atomsReject ions/molecules/compounds in place of atomsReject element instead of they/allReject H2Reject mixtureMarks2Accept words with other meaning (eg solely/exclusively)M2 DEP on reference to hydrogen and carbon even ifM1 not awardedAccept multiple in place of doubleAccept contain C CIgnore references to single bonds11All three correct scores 2 marksTwo correct scores 1 mark2If more than three answers given lose one mark foreach error eg BCEF scores 1 markebecause it has no double bond(s) / has onlysingle bonds / is saturatedAccept because only unsaturated compoundsdecolourise bromine waterAccept because only alkenes decolourise brominewaterAccept because it’s not an alkeneAccept because it’s not unsaturatedAccept because it’s a (cyclo)alkane1
Questionnumber7fiAnswerM1 for setting out calculationIf division upside down or division by one ormore atomic numbers, then 0/3M2 for obtaining ratioAccept any number of sig figs except oneAllow 0.92M3 for whole number ratioM3 DEP on llow alternative method:M1 calculation of Mr C2H4Br 108M2 expression for % of each elementeg C: 24/108 x100M3 evaluation to show these equal22.2%, 3.7%, 74.1%iiM1((2 12) (4 1) (1 80) ) 108M2(216 108 2)(so molecular formula is) C4H8Br2correct answer with no working scores 22
Questionnumber8aAnswerNotesMarksi2NdF3 3Ca 2Nd 3CaF2Accept fractions and multiples1iicalcium fluoride AND neodymium fluoride(in either order)Accept formulae1iiiionicAccept electrovalentIgnore giantIgnore electron transferReject covalent bonding/intermolecular forces1penalise incorrect use of symbols andsubscripts1ivNd2O3
bM1(neodymium ions in) layers/rows/planes/sheets/OWTTEAccept atoms/cations/particles for ionsReject moleculesM2slide/slip (over each other)Allow OWTTE, eg flow/shift/roll/moveM2 DEP on mention of EITHERlayers or equivalentOR mention of ions or equivalentDo not award M2 ifmolecules/protons/electrons/nuclei inplace of ions etcIf reference to ionic bonding / covalentbonding /molecules / intermolecularforces, no marksM3delocalised electrons OR sea of electronsM4(can) flow/travel/move (through structure) / are mobile(when voltage/pd is applied)Not just electronsIgnore free electronsIgnore carry chargeM4 DEP on M3 or near miss4
Questionnumber9abAnswer(polystyrene is an) insulator /prevents/reduces heat lossNotesAccept is a poor conductor (of heat)Accept keeps heat inAccept doesn’t conduct (heat) as well (as glass)Ignore does not heat upIgnore references to accuracy/safety/breakagesReject to keep the temperature constantM1(after) 19.4(0)M2(before) 15.9(0)If readings are correct but in the wrong order, award 1mark for M1 and M2M33.5(0)M3 CQ on (M1 – M2)Marks13
ciM1 M2all seven points plotted to nearest gridlineDeduct 1 mark for each errorM3best fit straight line through first 4 points drawnwith aid of a rulerM4best fit straight line through last 3 points drawnwith aid of a rulerNo penalty if lines do not cross or if the two straightlines are joined by a curve4values correctly read from candidate’s graphDo not award these marks if lines do not cross or ifcurve drawniiM1(temperature)temperature to 0.1 ºCM2(volume)volume to 0.25 cm3If values correct but in wrong places allow 1/22
Questionnumber9dAnswerM1mass 47.7 (g)M2temperature change 5.8 ( C)M3(47.7 4.2 5.8 ) 1200 (J)NotesAccept 1160, 1162, 1161.97, 1161.972Reject 1161.9M3 CQ on M1 and M2 answer correct to two or moresig figCorrect final answer with or without working scores 3marksAccept answer in kJ if unit includedIgnore signMarks3
Questionnumber10 aiiiAnswerM1 n(Na2S2O3) 0.300 201000( n(SO2))NotesOR 0.006(0) mol3M2Mr of SO2 32 (2 x16) OR 64M3mass of SO2 (0.006 64) 0.38 (g)Mark CQ throughoutAccept any number of sig figCorrect final answer with or without markingscores 3 marksM1mass of SO2 in 1 dm3 0.38(4) 100050M1 CQ on M3 in ai 7.6(8) (g)M2this is less than 100 so no SO2 will escapeAccept any number of sig figIf candidate value for M1 is greater than 100,award M2 for opposite argumentIf no answer to M1 then M2 cannot be awardedORM1volume of solvent is 50cm3 which woulddissolve(100/20) 5(g)M20.384(g) is less than 5(g) so no SO2would escapeMarksIf answers based on volume of solvent 20cm3eg 20cm3 which would dissolve (100/50) 2(g)0.384(g) is less than 2(g) so no SO2 wouldescape worth 1 mark
bas the (hydrochloric) acid/HCl is addedAllow (immediately) after (all) the acid/HCladdedIgnore when the solutions are mixedcitimer started too late / stopped too earlyORii11thermometer (scale) read incorrectly / timer readincorrectlyAllow misread/incorrectly recorded thetemperature/time19.5 (s)Accept range 19-201
Questionnumber10diiiAnswerM1times are (very) shortNotesAccept reaction happens too/very/so quickly(so hard to time accurately/precisely)Ignore reaction is quickerIgnore hard(er) to measure rateAllow human reaction time becomes significantAllow references to shorter times producinggreater percentage (measurement)uncertainties/errorsM2heat loss greaterAccept heat loss occurs more quicklyAccept difficult to maintain a highertemperature/keep temperature constantIgnore references to evaporation occurringM1more collisions/particles have energyequal to/greater than the activation energyIgnore particles have more (kinetic) energyIgnore harder/more vigorous collisionsIgnore references to speed of particlesM2 (therefore there are) more successful collisions(per second)if state activation energy is lowered scores 0/2references to concentration scores 0/2Marks22
eAny three fromM1concentration of the (hydrochloric/nitric) acidM2volume of the (hydrochloric/nitric) acidAllow amount for volumeM3volume of sodium thiosulfateM4temperatureIf neither M2 or M3 scored allow 1 mark fortotal volume of the mixture ORdepth of liquid in the flaskIgnore reference to volume of waterIgnore references to size of flask/sameapparatusIgnore references to distance of eye from flask/the X/references to timing3
Questionnumber11 abiAnswerCH4 H2O CO 3H2Accept fractions and multiplesM1Ignore no effect on other factors egequilibrium (position)(increased pressure) has no effect (on yield)M2because equal numbers of (gas) moles/moleculeson each sideiiNotesM1(at higher temperature equilibrium position shiftsto left so yield of hydrogen) decreasesM2because (forward) reaction is exothermicDo not award M2 if M1 is incorrectAccept because backward reaction isendothermicAccept because reaction moves in theendothermic directionIgnore references to Le Chatelier’s principleeg increase in temperature favours theendothermic reactionDo not award M2 if M1 is incorrectMarks122
ciM1 for CO2 H2 / products below CO H2OM2 for approximately vertical line/arrow with H symbol/enthalpy change/-41kJ/molbetween reactants and products2M2 CQ on M1 unless if products above theactivation energyiino effect / OWTTE1iiiM1provides alternative pathway / route / OWTTEAccept words such as another / different inplace of alternative, but not just routeM2with lower activation energyAccept lowers the activation energyAccept less energy needed to start thereactionReject (catalyst) provides energy for M1 andM2Ignore references to providing surface forreaction2
Questionnumber11 dAnswerM1identifying reaction 3 or reaction 4M2a correct explanation for either egNotesMarksIgnore reactions 5 and 62in reaction 3, there is gain of hydrogenAccept increase in oxidation number of H /changes from 0 to ( )1Accept decrease in oxidation number of N /changes from 0 to -3Ignore references to gain/loss of electronsin reaction 4, there is gain of oxygenAccept decrease in oxidation number of O/changes from 0 to -2Accept increase in oxidation number of N /changes from -3 to ( )2Ignore references to gain/loss of electronsIgnore other explanationsAllow:Identifying both Reaction 3 and 4 only for 2marksIgnore any explanations
eM1n(NH3) 34 1000 2000 (mol)17M2Mr (NH4NO3) 80M3 mass (NH4NO3) 80 2000 160 000 g / 160 kgDo not award M3 if unit missing or incorrectORM1Mr (NH4NO3) 80M2(so) 17 (kg NH3) gives 80 (kg NH4NO3)M3Correct final answer with or without workingscores 3 marks(so) 34 (kg NH3) gives 80 x 34 160 kg17/ 160 000 gMark CQ throughout3
Questionnumber12abAnswerNotesMarksifuel oil1iifuel oil1iiigasoline1ialumina / silicaAccept aluminosilicates/zeolitesAccept aluminium oxide/silicon dioxide/siliconoxide/silicon (IV) oxide1Accept correct formulaeiiM1for correct formula - C4H8Accept C4H8 C4H8 for 2 marksM2for correct coefficient - 2Award 1 mark for 4C2H4Award 1 mark for C8H16Award 1 mark for two alkenes which have a total of 8Cand 16H eg C3H6 C5H102
iiiM1over/greater supply of long-chainhydrocarbons/molecules/heavy/heavier fractions / OWTTEM2high demand/more use for shortchain/small hydrocarbons/ light/lighterfractions / OWTTEM3cAlkenes used to make polymersM1forms sulfur dioxide (when burned)M2which causes specified problem forenvironmentORspecified problem for humansAccept long chain hydrocarbons/moleculesheavy/heavier fractions are of less use (as fuels)Accept answers in terms of petrol / fuel (for cars)Short chain hydrocarbon molecules are more useful/ingreater demand than long chainhydrocarbons/molecules scores M1 and M23Accept specific alkene and product eg ethene to makepoly(ethene)/ethanol/alcoholeg acid rain / damages trees / kills fish2eg toxic / respiratory irritant / triggers asthma attacksIgnore harmful gas
Questionnumber12 dAnswerNotesMarksM1 for only two (of the four) carbon atoms both withtwo Heg –CH2-CH2-CH2-CH2- scores 0M2 for (the other) two carbon atoms each with one Hand one CH3No M2 if methyl groups on 1st 2nd, or on 3rd 4thcarbons in chainDo not penalise bonds to H of CH3Max 1 if chain extended correctlyIgnore brackets and neach carbon must have four bondseg -CH2-CH-CH-CH2- scores 0if terminal Hs added max 10/2 if any double bonds shown2
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Accept upper case letters, eg S in place of s Accept words, eg liquid in place of l Accept answers in brackets 3 b CaCO 3 (s) 2HCl(aq) CaCl 2 (aq) H 2 O(l) CO 2 (g) Award 1 mark for s and g correct Award 1 mark for other 3 correct Accept upper case Reject words 2 c s / solid Accept upper case S in place of s 1
CSEC English A Specimen Papers and Mark Schemes: Paper 01 92 Mark Scheme 107 Paper 02 108 Mark Scheme 131 Paper 032 146 Mark Scheme 154 CSEC English B Specimen Papers and Mark Schemes: Paper 01 159 Mark Scheme 178 Paper 02 180 Mark Scheme 197 Paper 032 232 Mark Scheme 240 CSEC English A Subject Reports: January 2004 June 2004
Matthew 27 Matthew 28 Mark 1 Mark 2 Mark 3 Mark 4 Mark 5 Mark 6 Mark 7 Mark 8 Mark 9 Mark 10 Mark 11 Mark 12 Mark 13 Mark 14 Mark 15 Mark 16 Catch-up Day CORAMDEOBIBLE.CHURCH/TOGETHER PAGE 1 OF 1 MAY 16 . Proverbs 2—3 Psalms 13—15 Psalms 16—17 Psalm 18 Psalms 19—21 Psalms
Examiners should mark according to the mark scheme not according to their perception of where the grade boundaries may lie. All marks on the mark scheme should be used appropriately. All marks on the mark scheme are designed to be awarded. Examiners should always award full marks if deserved, i.e. if the answer matches the mark scheme.
H567/03 Mark Scheme June 2018 6 USING THE MARK SCHEME Please study this Mark Scheme carefully. The Mark Scheme is an integral part of the process that begins with the setting of the question paper and ends with the awarding of grades. Question papers and Mark Schemes are d
the mark scheme should be used appropriately. All the marks on the mark scheme are designed to be awarded. Examiners should always award full marks if deserved, i.e. if the answer matches the mark scheme. Examiners should also be prepared to award zero marks if the candidate’s response is not worthy of credit according to the mark scheme.
Mark scheme for Paper 1 Tiers 3-5, 4-6, 5-7 and 6-8 National curriculum assessments ALL TIERS Ma KEY STAGE 3 2009. 2009 KS3 Mathematics test mark scheme: Paper 1 Introduction 2 Introduction This booklet contains the mark scheme for paper 1 at all tiers. The paper 2 mark scheme is printed in a separate booklet. Questions have been given names so that each one has a unique identifi er .
Aug 15, 2019 · Mark Scheme (Results) Summer 2019 Pearson International Advanced Subsidiary Level In Chemistry (WCH11) Paper 01 Structure, . perception of where the grade boundaries may lie. There is no ceiling on achievement. All marks on the mark scheme should be used appropriately. All th
the mark scheme, the own figure rule can be used with the accuracy mark. Of Own Figure rule Accuracy marks can be awarded where the candidates’ answer does not match the mark scheme, though is accurate based on their valid method. cao Correct Answer Only rule Accuracy marks will only be awarded if the candidates’ answer is correct, and in line with the mark scheme. oe Or Equivalent rule .
