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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 2016 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 15 printed pages and 1 blank page. [Turn over IB16 11_0620_42/4RP © UCLES 2016 *5182765417* The syllabus is approved for use in England, Wales and Northern Ireland as a Cambridge International Level 1/Level 2 Certificate. www.smartexamresources.com

0620/42 October/November 2016  · CHEMISTRY 0620/42 Paper 4 Theory (Extended) October/November 2016 1 hour 15 minutes Candidates answer on the Question Paper. No Additional Materials

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Text of 0620/42 October/November 2016  · CHEMISTRY 0620/42 Paper 4 Theory (Extended) October/November 2016...

  • 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 2016

    1 hour 15 minutes

    Candidates answer on the Question Paper.

    No Additional Materials are required.

    Cambridge International ExaminationsCambridge International General Certificate of Secondary Education

    This document consists of 15 printed pages and 1 blank page.

    [Turn overIB16 11_0620_42/4RP© UCLES 2016

    *5182765417*

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

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  • 2

    0620/42/O/N/16© UCLES 2016

    1 Particles behave differently when in different physical states.

    (a) Solids have a fixed volume and a definite shape. Gases have no fixed volume and take the shape of the container.

    Describe the volume and shape of liquids.

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

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

    (b) Complete the table to show the separation, arrangement and movement of particles in eachphysical state.

    state separation of particles arrangement of particles movement of particles

    solid

    liquid touching one another randomly arranged move over one another

    gas

    [6]

    (c) Name the following changes of state.

    (i) Ice turning into water.

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

    (ii) Solid carbon dioxide turning directly into gaseous carbon dioxide at room temperature.

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

    [Total: 9]

    Liquids have a fixed volume and take the shape of the container in which they are poured

    touching regular vibrate

    not touchng random random

    Sublimation

    Melting

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  • 3

    0620/42/O/N/16© UCLES 2016 [Turn over

    2 This question is about atoms, ions and isotopes.

    (a) Define the term nucleon number.

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

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

    (b) Give the electronic structure of the following atom and ion.

    Na ..............................................................................................................................................

    P3– ..............................................................................................................................................[2]

    (c) State one medical use of radioactive isotopes.

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

    (d) What is meant by the term relative atomic mass?

    [2]

    (e) Suggest why the relative atomic mass of chlorine is not a whole number.

    [2]

    The total number of protons and neutrons in the nucleus of an atom is called as the nucleon number

    2:8:12:8:8

    In the treatment of cancer

    Relative atomic mass is the average mass of naturally occuring atoms of an element on a scale where the mass of Carbon-12 is exactly 12 units

    Chlorine must have more than one isotope and the masses of these isotopes are averaged . Hence the relative atomic mass of chlorine is not a whole number.

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  • 4

    0620/42/O/N/16© UCLES 2016

    (f) Aluminium is a metal in Group III.

    Describe the bonding in aluminium. Include a labelled diagram and any appropriate charges in your answer.

    [3]

    [Total: 12]

    Aluminium consists of a lattice of Al3+ ions with electrons between the ions .There exists attraction between the positive ions and the sea of delocalised electrons

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  • 5

    0620/42/O/N/16© UCLES 2016 [Turn over

    3 Clean, dry air contains a small amount of carbon dioxide.

    (a) The percentages of the other gases present in clean, dry air are shown in the table.

    Complete the table by inserting the names of these gases.

    name of gas percentage present

    78

    21

    1[2]

    (b) Oxides of nitrogen are atmospheric pollutants which can cause acid rain.

    Describe the formation of oxides of nitrogen and suggest how they can cause acid rain.

    [3]

    (c) Methane contributes to the greenhouse effect.

    State two sources of methane.

    1 Animal waste

    2 Fractional distillation of petroleum[2]

    (d) Combustion and respiration add carbon dioxide to the atmosphere.

    Name one natural process which removes carbon dioxide from the atmosphere.

    [1]

    [Total: 8]

    nitrogenoxygennoble gases

    Nitrogen and oxygen from the air react in the high temperatures of a car engine to form oxides of nitrogen . These then dissolve in water to form an acid.

    Photosynthesis

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  • 6

    0620/42/O/N/16© UCLES 2016

    4 Dilute nitric acid behaves as a typical acid in some reactions but not in other reactions.

    (a) Dilute nitric acid behaves as a typical acid when reacted with copper(II) oxide and withcopper(II) carbonate.

    Describe what you would see if excess dilute nitric acid is added separately to solid samplesof copper(II) carbonate and copper(II) oxide followed by warming the mixtures.

    copper(II) carbonate

    copper(II) oxide

    [4]

    (b) When dilute nitric acid is added to pieces of copper and heated, a reaction takes place andcopper(II) nitrate is formed.

    (i) Part of the chemical equation for the reaction between copper and dilute nitric acid isshown.

    Complete the chemical equation by inserting the formula of copper(II) nitrate and balancingthe equation.

    3Cu(s) + 8HNO3(aq) → 3Cu(NO3)2(aq) + 4H2O(l) + 2NO(g)[2]

    (ii) How is the reaction of dilute nitric acid with copper different from that of a typical metal witha typical acid?

    Hydrogen gas is not produced when copper reacts with nitric acid)

    [Total: 7]

    The bubbles disappear

    It dissolves and forms a blue solution

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  • 7

    0620/42/O/N/16© UCLES 2016 [Turn over

    5 Chlorine, bromine and iodine are halogens.

    (a) Chlorine can be made in the laboratory by heating manganese(IV) oxide with concentratedhydrochloric acid.

    MnO2(s) + 4HCl (aq) → MnCl 2(aq) + 2H2O(l) + Cl 2(g)

    Calculate the volume of 8.00 mol / dm3 HCl (aq) needed to react with 3.48 g of MnO2.

    • moles of MnO2 used

    • moles of HCl needed

    ................................ mol• volume of HCl needed

    ................................ cm3[4]

    (b) A student bubbled chlorine gas into a test-tube containing aqueous potassium bromide.

    (i) Describe the colour change seen in the test-tube.

    from ............................................................... to ...............................................................[2]

    (ii) Complete the ionic equation for this reaction.

    Include state symbols.

    Cl 2(g) + ......Br –(aq) → ................ + ................[3]

    Moles of MnO2 =Mass/Mr=3.48/87=0.04

    *Moles of HCl needed= 4 xMoles of MnO2= 0.04*4=0.16

    (0.16/8) x 1000 =20cm3

    courless yellow/orange /brown

    2 Br2(aq) + 2Cl –(aq)

    *FromStoichiometry of the equation

    0.16

    20

    Moles of HCl = 4 x Moles of 4

    Volume = moles/concentration= 0.16/8=0.02dm3 =0.02 x 1000=20cm3

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    KishoreTypewritten TextMole ratio 1 : 4 : 1 : 2 : 1

    KishoreTypewritten Text

  • 8

    0620/42/O/N/16© UCLES 2016

    (c) When one mole of bromine, Br2, reacts with one mole of propene, one organic product isformed.

    (i) Which part of the propene molecule reacts with bromine?

    [1]

    (ii) What is the name of the type of reaction which takes place between bromine and propene?

    [1]

    (d) When one mole of chlorine, Cl 2, reacts with one mole of propane, a mixture of two structuralisomers is formed.

    (i) What is the name of the type of reaction which takes place between chlorine and propane?

    [1]

    (ii) Explain what is meant by the term structural isomers.

    [2]

    (iii) Draw the structure of two structural isomers formed when one mole of chlorine reacts with

    one mole of propane.

    [2]

    Bromination

    Substitution

    Compounds with the same molecular formula but different structural formulae are called structural isomers

    The C=C double bond

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  • 0620/42/O/N/16© UCLES 2016 [Turn over

    (e) Iodine forms an oxide which has the composition by mass: I, 76.0%; O, 24.0%.

    (i) Use this information to determine the empirical formula of this oxide of iodine.

    empirical formula ...I2O5. [3]

    (ii) The oxide of iodine in (e)(i) dissolves in water.

    Predict and explain the effect of adding Universal Indicator to an aqueous solution of thisoxide of iodine.

    effect on Universal Indicator : Turns pinkexplanation .: This is because iodine is a non metal

    [2]

    [Total: 21]

    Moles of Iodine = 76.0 / 127 =0.59 Mole

    Hence

    I O

    1*2=2 2.5*2=5

    Moles of oxygen =24.0 / 16.0 =1.5 Mole

    Mole ratio 1 : 2.5

    Thus making the respective moles as their subscripts we get the following formula

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  • 10

    0620/42/O/N/16© UCLES 2016

    6 Aluminium is a very important metal.

    Aluminium is extracted from its ore, bauxite, by electrolysis. Bauxite is an impure form of aluminium oxide, Al 2O3.

    (a) Describe how aluminium is extracted from bauxite. Include an ionic half-equation for thereaction at each electrode.

    description

    ionic half-equation for the anode reaction

    ionic half-equation for the cathode reaction .[5]

    (b) Explain why the anodes have to be replaced regularly.

    [2]

    (c) Give two uses of aluminium and give a reason why aluminium is suitable for each use.

    [4]

    [Total: 11]

    Bauxite is dissolved in molten cryolite. This is because cryolite lowers the melting temperature. Molten aluminium forms at the cathode and Oxygen gas forms at the anode.

    2O2– → O2 + 4e–Al3+ + 3e– → Al

    Carbon electrodes burn in oxygen hence need to be replaced

    Use 1:manufacture of aircraft

    Reason 1:low density

    Use 2: food containers OR cooking foil

    reason 2: Al resistant to corrosionww

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    artex

    amres

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    s.com

  • 11

    0620/42/O/N/16© UCLES 2016 [Turn over

    Question 7 starts on the next page.

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  • 12

    0620/42/O/N/16© UCLES 2016

    7 Proteins are a major constituent of food.

    Proteins are polymers.

    (a) What is a polymer?

    [2]

    (b) Proteins can be converted into amino acids.

    (i) Name the type of chemical reaction which occurs when proteins are converted into aminoacids.

    [1]

    (ii) Suggest a condition needed to convert proteins into amino acids.

    [1]

    (c) A colourless mixture of amino acids was separated by chromatography. Amino acid X has an Rf value of 0.8. The chromatogram of the mixture after treatment with a locating agent is shown.

    solvent front

    baseline

    (i) How is an Rf value calculated?

    Rf =[1]

    (ii) On the diagram put a ring around the spot caused by amino acid X. [1]

    Polymers are large molecules made from many monomers joinedtogether.

    hydrolysis

    acid conditions

    distance moved by substance/distance moved by solvent frontwww.

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    KishoreOval

  • 13

    0620/42/O/N/16© UCLES 2016 [Turn over

    (iii) Describe how you would perform a chromatography experiment to produce thechromatogram shown in (c). Assume you have been given the mixture of amino acids anda suitable locating agent. You are provided with common laboratory apparatus.

    [3]

    A mixture of amino acids is placed as a spot onto a (pencil) baseline . The paper is then placed into a suitable solvent.After 10-15 minutes when the experiment gets done ( you cant see the spots yet but you can notice the solvent having moved up),add the locating agent added to the finished chromatogram to reveal spots.

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  • 14

    0620/42/O/N/16© UCLES 2016

    (d) When one molecule of an amino acid A combines with one molecule of another amino acid B,two different dipeptide molecules could be formed.

    Draw the structures of the two different dipeptide molecules. Show all of the atoms and all of the bonds in the linkages.

    amino acid A amino acid B

    N

    H

    H

    C

    O

    O H

    O

    O H

    N

    H

    H

    C

    [3]

    [Total: 12]

    N

    H

    C

    O

    N

    H

    C

    O

    + H2O

    + H2O

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  • 15

    0620/42/O/N/16© UCLES 2016

    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

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  • 16

    0620/42/O/N/16© UCLES 2016

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