06 0620 42 3RP (0620)/0620... · 4 Potassium reacts with bromine at room temperature to form potassium bromide. (a) ... Potassium bromide does not conduct electricity when solid but

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 12.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) May/June 2018

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 11 printed pages and 1 blank page.

[Turn overIB18 06_0620_42/3RP© UCLES 2018

*0107966450*

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

2

0620/42/M/J/18© UCLES 2018

1 Give the name of the process that is used:

(a) to obtain water from aqueous sodium chloride

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

(b) to produce lead from molten lead(II) bromide

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

(c) to separate an insoluble solid from a liquid

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

(d) to separate the components of petroleum

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

(e) to separate a mixture of coloured dyes.

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

[Total: 5]

3

0620/42/M/J/18© UCLES 2018 [Turn over

2 This question is about the elements in Period 3 of the Periodic Table.

Na Mg Al Si P S Cl Ar

For each of the following, identify a Period 3 element which matches the description. Each element may be used once, more than once or not at all.

State which Period 3 element:

(a) forms an oxide with a macromolecular structure

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

(b) is extracted from the ore bauxite

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

(c) is soft, metallic and stored in oil

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

(d) is a green gas at room temperature and pressure

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

(e) provides an inert atmosphere in lamps

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

(f) forms two different oxides during the Contact process

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

(g) is non‑metallic and an important component of fertilisers.

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

[Total: 7]

3 Complete the following table.

particle number ofprotons

number ofelectrons

number ofneutrons

number ofnucleons

11Na23 11 11 ................ 23

17Cl –37................ ................ 20 ................

2656

............. 26 24 30 56

[6]

[Total: 6]

4

0620/42/M/J/18© UCLES 2018

4 Potassium reacts with bromine at room temperature to form potassium bromide.

(a) Write a chemical equation for this reaction. Include state symbols.

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

(b) Potassium bromide exists as an ionic lattice. Potassium bromide does not conduct electricity when solid but does conduct electricity when

molten.

(i) What is meant by the term ionic lattice?

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

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

(ii) Explain why potassium bromide does not conduct electricity when solid but does conduct electricity when molten.

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

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

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

(c) Concentrated aqueous potassium bromide is an electrolyte.

(i) What is meant by the term electrolyte?

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

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

(ii) Describe the electrolysis of concentrated aqueous potassium bromide.

Include: ● an ionic half‑equation for the reaction at the cathode ● the name of the product at the anode ● the name of the potassium compound formed.

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

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

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

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

(iii) When molten potassium bromide is electrolysed, the product at the cathode is different.

Name the product at the cathode when molten potassium bromide is electrolysed.

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

5


(d) Iodine reacts with chlorine to form iodine monochloride, ICl, as the only product.

(i) Write a chemical equation for this reaction.

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

(ii) Draw a dot‑and‑cross diagram to show the electron arrangement in a molecule of iodine monochloride. Show outer shell electrons only.

[2]

(e) Potassium bromide has a melting point of 734 °C. Iodine monochloride has a melting point of 27 °C.

In terms of attractive forces, explain why there is a large difference between these melting points.

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

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

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

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

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

(f) When chlorine gas is passed through aqueous potassium bromide, a redox reaction occurs. The ionic equation is shown.

Cl 2 + 2Br – 2Cl – + Br2

(i) Write an ionic half‑equation showing what happens to the chlorine molecules, Cl 2, in this reaction.

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

(ii) Explain why the bromide ions, Br –, act as reducing agents in this reaction.

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

[Total: 23]

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0620/42/M/J/18© UCLES 2018

5 Hydrogen and iodine react together in a reversible reaction. Hydrogen iodide is formed.

H2(g) + I2(g) 2HI(g) colourless purple colourless gas gas gas

The forward reaction is exothermic.

A gas syringe containing an equilibrium mixture of hydrogen, iodine and hydrogen iodide gases was sealed and heated to 250 °C. The equilibrium mixture was a pale purple colour.

end blocked

equilibrium mixture of hydrogen,iodine and hydrogen iodide

(a) What is meant by the term equilibrium?

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

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

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

(b) The plunger of the gas syringe was pressed in while the end of the gas syringe was blocked. This increased the pressure. The position of the equilibrium did not change. The colour of the gaseous mixture turned darker purple.

(i) Give a reason why the position of the equilibrium did not change.

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

(ii) Suggest why the gaseous mixture turned darker purple, even though the position of the equilibrium did not change.

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

(c) The temperature of the gas syringe was increased to 300 °C.

(i) What happened to the position of the equilibrium when the temperature of the gas syringe was increased from 250 °C to 300 °C?

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

(ii) What happened to the rate of the forward reaction and the rate of the backward reaction when the temperature of the gas syringe was increased from 250 °C to 300 °C?

rate of the forward reaction .................................................................................................

rate of the backward reaction .............................................................................................[2]

[Total: 7]

7


6 (a) All sodium salts are soluble in water. All nitrates are soluble in water. Barium carbonate is insoluble in water.

Describe how you would make a pure, dry sample of barium carbonate by precipitation. Include:

● the names of the starting materials ● full practical details ● a chemical equation.

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

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

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

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

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

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

(b) Nitrates decompose when heated.

(i) Write a chemical equation for the decomposition of sodium nitrate when it is heated.

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

(ii) The unbalanced chemical equation for the decomposition of hydrated copper(II) nitrate crystals is shown.

Balance the chemical equation for this reaction.

2Cu(NO3)2.3H2O(s) .....CuO(s) + ......NO2(g) + O2(g) + ......H2O(g)[2]

(iii) When the hydrated copper(II) nitrate crystals are heated, steam is produced. When the steam condenses on a cool surface, it turns into a colourless liquid.

Anhydrous cobalt(II) chloride is used to show that the colourless liquid contains water.

How does the colour of the anhydrous cobalt(II) chloride change?

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

(iv) How would the student test to determine if the water produced in (b)(iii) is pure?

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

[Total: 12]

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0620/42/M/J/18© UCLES 2018

7 Many organic compounds, such as alcohols, carboxylic acids and esters, contain the elements carbon, hydrogen and oxygen only.

(a) Compound R has the following composition by mass: C, 60.00%; H, 13.33%; O, 26.67%.

Calculate the empirical formula of compound R.

empirical formula = .............................. [2]

(b) Compound S has the empirical formula C2H4O and a relative molecular mass of 88.

Calculate the molecular formula of compound S.

molecular formula = .............................. [2]

9


(c) Compounds T and V both have the molecular formula C3H6O2.

● Compound T produces bubbles of carbon dioxide gas when it is added to aqueous sodium carbonate.

● Compound V is an ester.

(i) What is the name given to compounds with the same molecular formula but different structures?

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

(ii) Draw the structures of compounds T and V. Show all of the atoms and all of the bonds.

compound T

compound V

[2]

(iii) All compounds with the molecular formula C3H6O2 can undergo complete combustion in an excess of oxygen.

Complete the chemical equation for this reaction.

C3H6O2 + ........................ ........................ + ........................[2]

(d) Compound W has the molecular formula C2H6O. Compound W reacts when heated with ethanoic acid and a catalyst to produce a sweet‑smelling liquid.

(i) Give the name of the homologous series to which compound W belongs.

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

(ii) Draw the structure of compound W. Show all of the atoms and all of the bonds.

[1]

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0620/42/M/J/18© UCLES 2018

(e) Alkanes and alkenes are hydrocarbons.

(i) What is meant by the term hydrocarbon?

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

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

(ii) State the general formula of:

alkanes ...............................................................................................................................

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

(f) Ethanol can be produced from long‑chain alkanes as shown.

step 1 step 2long‑chain alkane ethene ethanol

Describe the two‑stage manufacture of ethanol from the long‑chain alkane octane, C8H18. Include:

● the names of the types of chemical reactions that occur ● reaction equations ● reaction conditions.

step 1 ........................................................................................................................................

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

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

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

step 2 ........................................................................................................................................

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

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

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

[Total: 20]

11

0620/42/M/J/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.

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BLANK PAGE

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0620/42/M/J/18© UCLES 2018

Gro

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Ele

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1 Hhy

drog

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2 He

heliu

m4

III

IIIIV

VV

IV

IIV

III

3 Lilit

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4 Be

bery

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9

atom

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umbe

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atom

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sodi

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12 Mg

mag

nesi

um24

19 Kpo

tass

ium

39

20 Ca

calc

ium

40

37 Rb

rubi

dium

85

38 Sr

stro

ntiu

m88

55 Cs

caes

ium

133

56 Ba

bariu

m13

7

87 Frfra

nciu

m–

88 Ra

radi

um –

5 B boro

n11 13 Al

alum

iniu

m27 31 Ga

gallium70 49 In indium

115

81 Tlthallium

204

6 Ccarbon

12 14 Si

silicon

28 32 Ge

germanium

73 50 Sn tin 119

82 Pb

lead207

22 Tititanium

48 40 Zrzirconium

91 72 Hf

hafnium

178

104

Rf

rutherfordium

–

23 Vvanadium

51 41 Nb

niobium

93 73 Tatantalum

181

105

Db

dubnium

–

24 Cr

chromium

52 42 Mo

molybdenum

96 74 Wtungsten

184

106

Sg

seaborgium

–

25 Mn

manganese

55 43 Tctechnetium

– 75 Re

rhenium

186

107

Bh

bohrium

–

26 Fe iron

56 44 Ru

ruthenium

101

76 Os

osmium

190

108

Hs

hassium

–

27 Co

cobalt

59 45 Rh

rhodium

103

77 Iriridium

192

109

Mt

meitnerium

–

28 Ni

nickel

59 46 Pd

palladium

106

78 Pt

platinum

195

110

Ds

darmstadtium

–

29 Cu

copper

64 47 Ag

silver

108

79 Au

gold

197

111

Rg

roentgenium

–

30 Zn zinc 65 48 Cd

cadmium

112

80 Hg

mercury

201

112

Cn

copernicium

–

114 Fl

flerovium

–

116

Lvlivermorium

–

7 Nnitrogen

14 15 Pphosphorus

31 33 As

arsenic

75 51 Sb

antimony

122

83 Bi

bismuth

209

8 Ooxygen

16 16 S sulfur

32 34 Se

selenium

79 52 Tetellurium

128

84 Po

polo

nium

–

9 Fflu

orin

e19 17 Cl

chlo

rine

35.5

35 Br

brom

ine

80 53 Iio

dine

127

85 At

asta

tine

–

10 Ne

neon 20 18 Ar

argo

n40 36 Kr

kryp

ton

84 54 Xe

xeno

n13

1

86 Rn

rado

n–

21 Sc

scan

dium

45 39 Yyt

trium 89

57–7

1la

ntha

noid

s

89–1

03ac

tinoi

ds

57 Lala

ntha

num

139

89 Ac

lant

hano

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actin

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The

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actin

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–

58 Ce

ceriu

m140

90 Th thorium

232

59 Pr

praseodymium

141

91 Pa

protactinium

231

60 Nd

neodymium

144

92 Uuranium

238

61 Pm

promethium

– 93 Np

neptunium

–

62 Sm

samarium

150

94 Pu

plutonium

–

63 Eu

europium

152

95 Am

americium

–

64 Gd

gadolinium

157

96 Cm

curium

–

65 Tb terbium

159

97 Bk

berkelium

–

66 Dy

dysprosium

163

98 Cf

californium

–

67 Ho

holmium

165

99 Es

einsteinium

–

68 Er

erbium

167

100

Fm fermium

–

69 Tm thulium

169

101

Md

mendelevium

–

70 Yb

ytterbium

173

102

No

nobelium

–

71 Lu lutetium

175

103 Lr

lawrencium

–

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Documents

06 0620 42 3RP (0620)/0620... · 4 Potassium reacts with bromine at room temperature to form potassium bromide. (a) ... Potassium bromide does not conduct electricity when solid but

Text of 06 0620 42 3RP (0620)/0620... · 4 Potassium reacts with bromine at room temperature to form...