Khalifah

Topics: Sulfuric acid, Alcohol, Chlorine Pages: 25 (3607 words) Published: August 21, 2013
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Peraturan Permarkahan CHEMISTRY 4541 Kertas 1 Ogos 2011

BAHAGIAN PENGURUSAN SEKOLAH BERASRAMA PENUH DAN SEKOLAH KECEMERLANGAN KEMENTERIAN PELAJARAN MALAYSIA

PERATURAN PERMARKAHAN PEPERIKSAAN PERCUBAAN SIJIL PELAJARAN MALAYSIA 2011

CHEMISTRY TRIAL 2011 MARKING SCHEME

PAPER 1

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2 SKEMA KERTAS 1 CHEMISTRY 4541/1

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

C B C D A A C A A C A B C A C D D A C B B A D B A

26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

C D D D B B A C A C C B C C D B B D C B C B D A C

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Peraturan Permarkahan CHEMISTRY 4541 Kertas 2 Ogos 2011

BAHAGIAN PENGURUSAN SEKOLAH BERASRAMA PENUH DAN SEKOLAH KECEMERLANGAN KEMENTERIAN PELAJARAN MALAYSIA

PERATURAN PERMARKAHAN PEPERIKSAAN PERCUBAAN SIJIL PELAJARAN MALAYSIA 2011

CHEMISTRY TRIAL 2011 MARKING SCHEME

PAPER 2

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2 MARKING SCHEME FOR CHEMISTRY PAPER 2

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No. 1. (a) (i) (ii)

Answer Zinc

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1. The presence of X/zinc atoms disrupts the orderly arrangements of copper atoms 2. This reduce the layers of atoms from sliding over one another easily Steel Silicon dioxide/silica /sand Heat resistant/can withstand with high temperature

(iii) (b)(i) (ii) (c) (i)

H Cl | | C == C | | H H

1

(ii) (iii)

Polyvinyl chloride/ polychloroethene polymerization TOTAL

1 1 9

No 2(a) (b) (c)(i)

Answer Horizontal row of elements in the Periodic Table of Elements Atoms have 3 shells occupied with electron 1. Correct formulae of reactants and products 2. Balanced equation Cl2 + H2O → HCl + HOCl Sodium Chlorine Red litmus paper blue Blue litmus paper red http://cikguadura.wordpress.com

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(ii)

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3 Answer 1. Atomic size decrease 1. Proton number / number of proton / nuclei charge increase 2 Nuclei attraction on valence electron is stronger TOTAL

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No. (d)(i) (ii)

2 9

No. 3 (a) Oxidation

Answer

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(b)(i) To allow the movement / flow of ions (ii) (c) (d) Potassium nitrate solution [ any suitable substance] From copper electrode to silver electrode Intensity of blue colour solution increase Because the concentration /number of Cu2+ increase Cu (e) (f)(i) (ii) Cu2+ + 2e

Formula of reactant and product Balanced Increase The distance between zinc and silver is further than copper and silver in electrochemical series TOTAL

1 1 1 1 10

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No. 4. (a) (b)

Answer A chemical formula that shows the simplest ratio of atom of element in a compound. Number of mole = Mass Relative atomic mass

Mark 1

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(c)(i) (ii) (d) (e)(i) (ii) (iii) (iv)

Num. of mole of copper = 2.56 / 0.04 64 Num. of mole of oxygen = 0.64 / 0.04 16 CuO Magnesium and hydrochloric acid / Zinc and sulphuric acid CuO + H2  Cu + H2O Black powder change to brown Water 2 1 1 2 1 1 TOTAL 10

No. 5(a)(i) (ii)

Answer Temperature Num. of mole = 0.24 mol / 0.01 mol 24 Volume of H2 = 0.01 x 24 dm3 / 0.24 dm3 / 240 cm3

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(b)

Average rate of reaction in experiment I = 240 cm3s-1 / 4.8 cm3s-1 50 Average rate of reaction in experiment II = 240 cm3s-1 / 12 cm3s-1 20 2 1

(c)(i)

Rate of reaction of experiment II is higher than experiment I

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No.

Answer

Mark

(c)(ii) -The temperature of...
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