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  • READ THESE INSTRUCTIONS FIRST

    Write your Centre number, candidate number and name on all the work you hand in.

    Write in dark blue or black pen.

    You may use an HB pencil for any diagrams or graphs.

    Do not use staples, paper clips, glue or correction fluid.DO NOT WRITE IN ANY BARCODES.

    Answer all questions.

    Electronic calculators may be used.

    A copy of the Periodic Table is printed on page 16.

    You may lose marks if you do not show your working or if you do not use appropriate units.

    At the end of the examination, fasten all your work securely together.

    The number of marks is given in brackets [ ] at the end of each question or part question.

    CHEMISTRY 0620/42

    Paper 4 Theory (Extended) October/November 2018

    1 hour 15 minutes

    Candidates answer on the Question Paper.

    No Additional Materials are required.

    Cambridge International Examinations

    Cambridge International General Certificate of Secondary Education

    This document consists of 13 printed pages and 3 blank pages.

    [Turn overIB18 11_0620_42/3RP

    © UCLES 2018

    *4401701629*

    The syllabus is approved for use in England, Wales and Northern Ireland as a Cambridge International Level 1/Level 2 Certificate.

  • 2

    0620/42/O/N/18© UCLES 2018

    1 Element X can undergo the following physical changes.

    gaseous Xboiling or

    evaporation

    liquid X

    solid X

    2

    4

    3

    1

    (a) (i) Givethescientificnameforeachofthenumberedphysicalchanges.

    1 ..........................................................................................................................................

    2 ..........................................................................................................................................

    3 ..........................................................................................................................................

    4 .......................................................................................................................................... [4]

    (ii) Explain why the changes shown are physical changes.

    .............................................................................................................................................

    ....................................................................................................................................... [1]

    (iii) Onedifferencebetweenboilingandevaporationistherateatwhichtheprocessesoccur.

    State oneotherdifferencebetweenboilingandevaporation.

    .............................................................................................................................................

    ....................................................................................................................................... [1]

    (b) Describetheseparation,arrangementandmotionofparticlesofelementX in the solid state.

    separation ..................................................................................................................................

    arrangement ..............................................................................................................................

    motion ........................................................................................................................................ [3]

    (c) Element XisaGroupImetal.ItburnsinairtoformanoxideX2O.

    Write a chemical equation for this reaction.

    .............................................................................................................................................. [2]

    [Total: 11]

  • 3

    0620/42/O/N/18© UCLES 2018 [Turn over

    2 Magnesium,calciumandstrontiumareGroupIIelements.

    (a) Completethetabletoshowthearrangementofelectronsinacalciumatom.

    shellnumber 1 2 3 4

    numberofelectrons

    [1]

    (b) Describehowthearrangementofelectronsinastrontiumatomis:

    (i) similar to the arrangement of electrons in a calcium atom

    .............................................................................................................................................

    .............................................................................................................................................

    (ii) different from the arrangement of electrons in a calcium atom.

    .............................................................................................................................................

    .............................................................................................................................................

    [2]

    (c) Calcium reacts with cold water to form two products:

    ● acolourlessgas,P,which‘pops’withalightedsplint ● aweaklyalkalinesolution,Q,whichturnsmilkywhencarbondioxideisbubbledthroughit.

    (i) Name gas P.

    ....................................................................................................................................... [1]

    (ii) IdentifytheionresponsibleformakingsolutionQ alkaline.

    ....................................................................................................................................... [1]

    (iii) Suggest the pH of solution Q.

    ....................................................................................................................................... [1]

    (iv) Write a chemical equation for the reaction of calcium with cold water.

    ....................................................................................................................................... [2]

  • 4

    0620/42/O/N/18© UCLES 2018

    (d) Magnesiumreactswithchlorinetoformmagnesiumchloride,MgCl 2. Magnesium chloride is an ionic compound.

    (i) Complete the diagrams to show the electronic structures of the ions in magnesium chloride.

    Show the charges on the ions.

    Cl

    ......

    Mg

    ......

    Cl

    ......

    [3]

    (ii) Give three physical properties that are typical of ionic compounds such as MgCl 2.

    1 ..........................................................................................................................................

    2 ..........................................................................................................................................

    3 ..........................................................................................................................................

    [3]

    (e) Aqueous magnesium chloride is added to aqueous silver nitrate. A white precipitate forms.

    Write an ionicequationforthisreaction.Includestatesymbols.

    .............................................................................................................................................. [2]

    [Total: 16]

  • 5

    0620/42/O/N/18© UCLES 2018 [Turn over

    3 Sulfur is an important element.

    (a) Explainhowburningfossilfuelscontainingsulfurleadstotheformationofacidrain.

    ....................................................................................................................................................

    ....................................................................................................................................................

    .............................................................................................................................................. [2]

    (b) SulfuricacidismanufacturedbytheContactprocess.OnestepintheContactprocessinvolvesareversiblereactioninwhichsulfurtrioxide,SO3,isformed.

    (i) Writeachemicalequationforthisreversiblereaction.Includethecorrectsymboltoshowthatthereactionisreversible.

    ....................................................................................................................................... [2]

    (ii) Statetheconditionsandnamethecatalystusedinthisreversiblereaction.

    temperature ........................................................................................................................

    pressure ..............................................................................................................................

    catalyst ...............................................................................................................................

    [3]

    (iii) Describehowthesulfurtrioxideformedisconvertedintosulfuricacidinthenextstepsofthe Contact process.

    .............................................................................................................................................

    .............................................................................................................................................

    ....................................................................................................................................... [2]

  • 6

    0620/42/O/N/18© UCLES 2018

    (c) Dilute sulfuric acid is used to make salts known as sulfates.

    Amethodconsistingofthreestepsisusedtomakezincsulfatefromzinccarbonate.

    step 1 Addanexcessofzinccarbonateto20cm3of0.4mol/dm3 dilute sulfuric acid until the reaction is complete.

    step 2 Filter the mixture.

    step 3 Heatthefiltrateuntilasaturatedsolutionformsandthenallowittocrystallise.

    (i) Nameasuitablepieceofapparatusformeasuring20cm3 of dilute sulfuric acid in step 1.

    ....................................................................................................................................... [1]

    (ii) State twoobservationswhichwouldshowthatthereactioniscompleteinstep 1.

    1 ..........................................................................................................................................

    2 ..........................................................................................................................................

    [2]

    (iii) Whyisitimportanttoaddanexcessofzinccarbonateinstep 1?

    ....................................................................................................................................... [1]

    (iv) Whatismeantbythetermsaturated solution in step 3?

    .............................................................................................................................................

    ....................................................................................................................................... [2]

    (v) The equation for the reaction is shown.

    ZnCO3(s) + H2SO4(aq) ZnSO4(......) + H2O(l) + CO2(g)

    Completetheequationbyinsertingthestatesymbolforzincsulfate. [1]

    (vi) Name another zinc compound which could be used to make zinc sulfate from dilutesulfuric acid using this method.

    ....................................................................................................................................... [1]

    (vii) Suggest why this method would notworktomakebariumsulfatefrombariumcarbonateand dilute sulfuric acid.

    ....................................................................................................................................... [1]

  • 7

    0620/42/O/N/18© UCLES 2018 [Turn over

    (d) In a titration, a student added 25.0cm3 of 0.200mol/dm3 aqueous sodium hydroxide to a conical flask.The student thenaddeda fewdrops ofmethyl orange to the solution in theconicalflask.

    Dilutesulfuricacidwasthenaddedfromaburettetotheconicalflask.Thevolumeofdilutesulfuricacidneededtoneutralisetheaqueoussodiumhydroxidewas20.0cm3.

    2NaOH + H2SO4 Na2SO4 + 2H2O

    (i) What was the colour of the methyl orange in the aqueous sodium hydroxide?

    ....................................................................................................................................... [1]

    (ii) Determinetheconcentrationofthedilutesulfuricaciding/dm3.

    ● Calculate thenumberofmolesofaqueoussodiumhydroxideaddedto theconicalflask.

    .............................. mol

    ● Calculatethenumberofmolesofdilutesulfuricacidaddedfromtheburette.

    .............................. mol

    ● Calculatetheconcentrationofthedilutesulfuricacidinmol/dm3.

    ..............................mol/dm3

    ● Calculatetheconcentrationofthedilutesulfuricaciding/dm3.

    ..............................g/dm3 [4]

  • 8

    0620/42/O/N/18© UCLES 2018

    (e) Iron(II) sulfate decomposes when heated strongly.

    2FeSO4(s) Fe2O3(s) + SO2(g) + SO3(g)

    15.20gofFeSO4(s)washeatedandformed4.80gofFe2O3(s).

    [Mr,FeSO4=152;Mr,Fe2O3=160]

    Calculate the percentage yield for this reaction.

    .............................. % [3]

    [Total: 26]

  • 9

    0620/42/O/N/18© UCLES 2018 [Turn over

    4 Astudentinvestigatedtheprogressofthereactionbetweendilutehydrochloricacid,HCl,andanexcessoflargepiecesofmarble,CaCO3,usingtheapparatusshown.

    gas syringe

    dilute

    hydrochloric acid an excess of large

    pieces of marble

    (a) A graph of the volume of gas produced against time is shown.

    150

    100

    50

    0

    volume of gas

    produced / cm3

    0 30 60 90 120

    time / s

    150 180 210 240

    (i) How does the shape of the graph show that the rate of reaction decreased as the reaction

    progressed?

    .............................................................................................................................................

    ....................................................................................................................................... [1]

    (ii) Why did the rate of reaction decrease as the reaction progressed?

    ....................................................................................................................................... [1]

    (iii) Afterhowmanysecondsdidthereactionfinish?

    .............................. s [1]

    (b) Theexperimentwas repeatedusing the samemassof smaller piecesofmarble.All otherconditions were kept the same.

    Draw a graph on the grid to show the progress of the reaction using the smaller pieces of

    marble. [2]

  • 10

    0620/42/O/N/18© UCLES 2018

    (c) The original experiment was repeated at a higher temperature. All other conditions were kept

    the same.

    Describeandexplain, in termsof collisionsbetweenparticles, theeffect of usingahighertemperatureonthetimetakenforthereactiontofinish.

    ....................................................................................................................................................

    ....................................................................................................................................................

    ....................................................................................................................................................

    ....................................................................................................................................................

    ....................................................................................................................................................

    ....................................................................................................................................................

    ....................................................................................................................................................

    ....................................................................................................................................................

    ..............................................................................................................................................[5]

    [Total:10]

  • 11

    0620/42/O/N/18© UCLES 2018 [Turn over

    5 Alkynesareahomologousseriesofunsaturatedhydrocarbons. AllmemberscontainaC≡Ctriplebond.

    (a) Completethetableshowinginformationaboutthefirstthree alkynes.

    formula C2H2 C3H4

    structure H–C≡C–H H–C≡C–CH3 H–C≡C–CH2–CH3

    name ethyne butyne

    [2]

    (b) Completethedot-and-crossdiagramtoshowtheelectronarrangementinamoleculeofethyne, H–C≡C–H.Showoutershellelectronsonly.

    H HC C

    [2]

    (c) Compounds in the same homologous series have the same general formula.

    (i) Give twoothercharacteristicsofmembersofahomologousseries.

    1 ..........................................................................................................................................

    2 ..........................................................................................................................................

    [2]

    (ii) Usetheinformationinthetablein(a) to deduce the general formula of alkynes.

    ....................................................................................................................................... [1]

    (d) Alkynes are unsaturated.

    Describeatestforunsaturation.

    test .............................................................................................................................................

    result ..........................................................................................................................................

    [2]

  • 12

    0620/42/O/N/18© UCLES 2018

    (e) (i) Nameanoxidisingagentwhichcanbeusedtooxidiseethanoltoethanoicacid.

    ....................................................................................................................................... [2]

    (ii) Drawthestructureofethanoicacid.Showalloftheatomsandallofthebonds.

    [1]

    (f) Carboxylicacidscanbeconvertedintoesters.

    (i) Theester formedby reactingpropanoicacidandmethanol has themolecular formulaC4H8O2.

    Namethisesteranddrawitsstructure.Showalloftheatomsandallofthebonds.

    name of the ester ................................................................................................................

    structure of the ester

    [2]

    (ii) Name another ester with the molecular formula C4H8O2.

    ....................................................................................................................................... [1]

    (g) Polyesters are polymers.

    (i) What type of polymerisation is used in the manufacture of polyesters?

    ....................................................................................................................................... [1]

    (ii) Name a polyester.

    ....................................................................................................................................... [1]

    [Total: 17]

  • 13

    0620/42/O/N/18© UCLES 2018

    BLANK PAGE

  • 14

    0620/42/O/N/18© UCLES 2018

    BLANK PAGE

  • 15

    0620/42/O/N/18© UCLES 2018

    Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable

    effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the publisher will

    be pleased to make amends at the earliest possible opportunity.

    To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced online in the Cambridge International

    Examinations Copyright Acknowledgements Booklet. This is produced for each series of examinations and is freely available to download at www.cie.org.uk after

    the live examination series.

    Cambridge International Examinations is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of University of Cambridge Local

    Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge.

    BLANK PAGE

  • 16

    0620/42/O/N/18© UCLES 2018

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    4

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    rutherfordium

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    molybdenum

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    seaborgium

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    technetium

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    ruthenium

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    nickel

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    palladium

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    platinum

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    silver

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    gold

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    antimony

    122

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    128

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