Skema Pecutan Akhir Chemistry p2 p3 Spm 2013

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  • 8/10/2019 Skema Pecutan Akhir Chemistry p2 p3 Spm 2013

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    SECTIO

    1. (a) an

    (b) Zn

    (c) copp

    (d) To e(e) Repe

    (f)

    MassNo of mRatioEmpirical

    2. (a)(i)

    (ii) U

    (iii) W

    (b) (i) 2.

    (ii) X+

    (c)(i) Th

    (ii) X, Y,

    (d) (i) 4

    (ii) 2X +

    3. (a)(i)

    (ii) Grou

    (iii) Ato

    (b)(i) 2.

    (ii)

    (iii) Q

    (c) P an

    (d)(i) ion(ii)

    (e)(i) Co

    N A

    hydrous cal

    2HCl

    r(II) oxide

    sure that tat the heati

    X5.32

    l 0.761

    formula =

    .1

    y have the

    Z

    + O2

    2H2O

    .4

    14 and pe

    P has 4 val

    Q2+ + 2eR. They ha

    ic bond

    alent bond

    ium chlorid

    ZnCl2 + H2

    e combustig, cooling

    4.560 =/ 64 = 0.0

    XO

    same 3 she

    2X2O

    2XOH +

    iod 2

    lence electr

    ve the sam

    n tube is tnd weighin

    0.768 g12

    lls occupied

    2

    ns and has

    proton nu

    tally filledprocess u

    O5.520 50.192 / 11

    with electro

    2 shells occ

    ber but dif

    ith hydrogetil a consta

    .328 = 0.19= 0.012

    ns

    upied with

    ferent nucle

    n gasnt mass is p

    2 g

    lectrons

    on number.

    roduced

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    (ii)

    4. (a) Al

    (b)

    p

    s

    c

    T

    h

    (c) Maki

    (d) M1V1(2.0)(25

    M2

    (e) 2Na

    (f) (i)

    (ii) HClNo of m

    From the

    No of m

    0.0

    M

    ali which io

    H value for

    dium hydr

    ncentratio

    he concentr

    igher the co

    g soap

    = M2V2

    = M2(75)

    = 0.67 m

    2H2O

    NaOHl NaOH =

    equation,

    0.

    l HCl = MV

    = M(2

    = 2.5

    nizes compl

    odium hyd

    xide is stro

    of hydroxi

    ation of hyd

    ncentration

    l dm-3

    2NaOH

    NaCl + HV / 1000 =

    mol NaOH

    5 mol NaO

    /1000

    0) / 1000

    mol dm-3

    tely in wat

    oxide is 14

    g alkali whi

    e ions

    roxide ion i

    of hydroxid

    + H2

    O2.0(25) / 1

    : 1 mol HCl

    : 0.05 mol

    r to form hi

    and pH valu

    ch ionizes c

    sodium hy

    ion, the hi

    00 = 0.05

    HCl

    igh concent

    e for ammo

    ompletely i

    droxide is hi

    gher the pH

    ol

    ation of hy

    nia is 11

    water to f

    igher than a

    value.

    roxide ions

    rm higher

    mmonia. T

    .

    e

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    5. (a) Th

    between

    (b) (i) H

    (ii) no of

    No of m

    (iii) 1 m

    0.025 m

    (iv) 0.02

    1 mol Ag

    Heat of

    (c)

    (d) Ag+

    6. (a) To

    (b) (i) H

    (ii) no ofno of mo

    0.2 mol

    0.2 mol

    1 mol H2

    Heat of

    e heat chan

    sodium chl

    = mc= (

    mol Ag+ =

    l Cl = MV

    l Ag++ 1 m

    l Ag++ 0.0

    mol AgCl

    Cl release 5

    recipitation

    Cl A

    reduce the

    at change,

    mol NaOHl HCl = MV

    Cl + 0.2 m

    2O release

    5460

    eutralizatio

    ge(release)

    ride solutio

    0 + 50) (4.

    V / 1000

    / 1000 = (

    ol Cl 1

    25 mol Cl

    elease 147

    8800 J mol-

    , H = - 58.

    gCl

    heat loss to

    H = mc

    = MV / 100/ 1000 = (2

    ol NaOH

    10920 J of

    J mol-1

    , H = - 5

    when 1 mol

    n and silver

    ) ( 30.5

    (0.5)(50) /

    .5)(50) / 1

    mol AgCl

    0.025 m

    J of heat

    of heat

    8 kJ mol-1

    the surrou

    (100 + 10

    = (2.0)(10.0)(100) / 1

    0.2 mol H2eat

    .6 kJ mol-1

    of silver ch

    nitrate solu

    7) = 1470

    1000 = 0.0

    00 = 0.025

    l AgCl

    ding

    ) (4.2) (41

    0) / 1000 =00 = 0.2

    loride is for

    ion.

    25 mol

    mol

    28) = 10

    0.2 molol

    ed from th

    20 J

    e reaction

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    (c)

    (d) The

    hydrochl

    (e)(i) les

    (ii) Etha

    complete

    7. (a)

    (b) Zn

    (c) Exp I

    Exp II:

    eat change

    ric acid an

    than - 54.

    oic acid is a

    ly.

    H2SO4

    : Average r

    verage rate

    / released

    sodium hy

    kJ mol-1//

    weak acid.

    ZnSO4 +

    te of reacti

    of reaction

    hen 1 mol

    roxide solu

    any value l

    Some of he

    H2

    n = 32 cm3

    = 20 cm3/

    of water is

    tion.

    wer than -

    at released

    / 120 s =

    120 s = 0.1

    ormed fro

    54.6 kJ mol

    is used to i

    .27 cm3s-1

    7 cm3s-1

    the reactio

    -1

    nize the et

    n between

    anoic acid

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    (c)

    9. (a) (i)

    (ii) body

    (iii) PVC

    (b) (i) Sa

    (ii) To pr

    (iii) Diss

    Dissolve

    (c)(i) as

    (ii) To tr

    (iii) To c

    zinc

    of an aerop

    does not ru

    ponification

    oduce soap

    lves in wat

    in oils and

    irin // para

    at diabetes

    lm the pati

    lane

    t

    precipitate

    r : Part B

    grease: Hy

    etamol

    nt.

    / To reduc

    rophobic

    solubility of soap

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    SECTIO

    10. (a) C

    Tempera

    Pressure

    Catalyst

    (b)

    P

    B

    (c)

    S

    S

    S

    2

    C

    T

    P

    C

    S

    S

    H

    N B

    onditions fo

    ture : 450

    : 200 atm

    : Iron

    ure copper

    hich are ar

    hen force i

    ronze consi

    hich disrup

    hen force i

    ulphur is bu

    + O2

    ulphur dioxi

    SO2 + O2

    onditions re

    emperature

    ressure: 1

    atalyst: Van

    ulphur trioxi

    O3 + H2S

    leum is dilu

    2S2O7 + H

    r Haber Pro

    onsist of at

    anged in or

    applied, th

    ts of tin ato

    the orderly

    applied, th

    rned in oxy

    SO2

    e is burne

    2SO3

    quired:

    : 450C

    tm

    adium(V) o

    de is dissol

    4 H2S2O

    ed in water

    O 2H2

    ess:

    oms of the

    derly mann

    e layer of a

    ms of differ

    arrangeme

    e layers of

    en to form

    in oxygen

    ide

    ed in conce

    7

    to form sul

    O4

    ame size

    r

    oms easily

    ent size

    nt of pure c

    ure copper

    sulphur dio

    o form sulp

    ntrated sulp

    phuric acid

    lide over o

    opper atom

    not easily s

    ide

    hur trioxide

    huric acid t

    e another

    s

    lide over on

    form oleu

    e another

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    (d)

    Sulphur dioxide gas is released to the atmosphere and cause air pollution.

    The air pollution can cause respiratory problems and asthma.

    Sulphur dioxide released also react with rain water to form acid rain.

    Acid rain can corrode buildings, cars, increase acidity of rivers and lakes and increase

    acidity of soil.

    (e)(i) Procedure

    1. Fill a burette with 1 mol dm-3sulphuric acid. Record the initial burette reading, V1.

    2. Pour 25 cm3of 1 mol dm-3ammonia / ammonium hydroxide solution into a conical flask. Add

    three drops of phenolphthalein into the conical flask.

    3. Add sulphuric acid solution from the burette into the conical flask slowly. Swirl the conical

    flask.

    4. Stop adding sulphuric acid when the solution in conical flask turn from pink to colourless.

    Record the final burette reading, V2.

    5. Calculate the volume of sulphuric acid used, V = V2 V16. Pour 25 cm3of ammonia / ammonium hydroxide solution into a beaker.

    7. Add V cm3of sulphuric acid into the beaker and stir the mixture.

    8. Heat and evaporate the salt solution until 1/3 its original volume.

    9. Cool the saturated salt solution at room temperature.

    10. The ammonium sulphate crystals are filtered.

    11. The ammonium sulphate crystals are pressed between two filter papers.

    (ii)

    Pour 2 cm3

    of ammonium sulphate solution into a test tube Add 2 cm3of dilute hydrochloric acid followed by 2 cm3of barium chloride solution into

    the test tube

    Shake the mixture

    White precipitate is formed

    Sulphate ion is confirmed present.

    11. (a) (i) Haber process

    (ii) N2 + 3H2 2NH3

    (iii) Catalyst : IronPressure: 200 atm

    Temperature : 450C

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    (b) (i) ethanol and propanoic acid

    (ii) Ethanol:

    Ethanol undergo dehydration process when with heated porcelain chips to produce

    ethene and water

    Ethanol undergo oxidation process when heated with acidified potassium

    manganate(VII) to produce ethanoic acid and waterPropanoic acid:

    Propanoic acid react with calcium carbonate to produce calcium ethanoate, carbon

    dioxide and water

    Propanoic acid react with zinc to produce zinc ethanoate and hydrogen gas

    (c) Reaction with bromine water:

    1. Pour 2 cm3of hexane into a test tube.

    2. Add 3 drops of bromine water into the test tube

    3. Shake the mixture

    4. Repeat steps 1 t