Cambridge IGCSE: Chemistry 0620/23
Cambridge IGCSE: Chemistry 0620/23
Cambridge IGCSE: Chemistry 0620/23
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Cambridge IGCSE™
CHEMISTRY 0620/23
Paper 2 Multiple Choice (Extended) May/June 2023
45 minutes
INSTRUCTIONS
There are forty questions on this paper. Answer all questions.
For each question there are four possible answers A, B, C and D. Choose the one you consider correct
and record your choice in soft pencil on the multiple choice answer sheet.
Follow the instructions on the multiple choice answer sheet.
Write in soft pencil.
Write your name, centre number and candidate number on the multiple choice answer sheet in the
spaces provided unless this has been done for you.
Do not use correction fluid.
Do not write on any bar codes.
You may use a calculator.
INFORMATION
The total mark for this paper is 40.
Each correct answer will score one mark.
Any rough working should be done on this question paper.
The Periodic Table is printed in the question paper.
IB23 06_0620_23/5RP
© UCLES 2023 [Turn over
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2
1 2 3 4
1 2 3 4
3 Two atoms, X and Y, have the same mass number but different atomic numbers.
percentage
abundance isotope
of isotope / %
n
2 Fe
54
6 Fe
56
92 Fe
A 53 B 55 C 57 D 58
key
= Mg2+ magnesium ion
= O2– oxide ion
1 Magnesium ions are smaller than oxide ions because they contain fewer electrons.
2 Magnesium oxide has good electrical conductivity when molten because the ions
are mobile.
3 Magnesium oxide has a high melting point because of the strong electrostatic
attraction between the ions and delocalised electrons in the giant lattice.
6 In which molecule are all the outer-shell electrons involved in covalent bonding?
giant covalent
melting point
structure
A no high
B no low
C yes high
D yes low
8 Which row describes the structure of a solid metal and explains the property?
Which row identifies the product at the cathode and at the anode?
cathode anode
A bromine hydrogen
B hydrogen bromine
C hydrogen oxygen
D oxygen hydrogen
graphite anode
steel case
– + + –
aluminium oxide
dissolved in
molten cryolite
graphite cathode
molten aluminium
Which row shows the ionic half-equations at the cathode and the anode?
cathode anode
3
1
energy
2
4
progress of reaction
1 2 3 4
A reactants H Ea products
B products H Ea reactants
C reactants Ea H products
D products Ea H reactants
bond energy
bond
in kJ / mol
C–H 412
C–C 348
C=C 612
C–O 360
C=O 743
O–O 146
O=O 496
O–H 463
What is the overall energy change when one mole of ethene is completely burned?
14 Magnesium reacts with hydrochloric acid to form magnesium chloride and hydrogen.
pressure temperature
catalyst
/ atm / C
A iron 2 100
B iron 200 450
C vanadium(V) oxide 2 450
D vanadium(V) oxide 200 100
16 A student heats hydrated copper(II) sulfate. The blue crystals change to a white powder.
D Mg + 2HCl MgCl 2 + H2
21 Which set of elements shows the change from metallic to non-metallic character across a period
of the Periodic Table?
22 A sample of ethanoic acid and a sample of hydrochloric acid have the same concentration.
How do the hydrogen ion concentration and pH of ethanoic acid compare to those of
hydrochloric acid?
A higher higher
B higher lower
C lower higher
D lower lower
25 Water from a reservoir flows to the water works where purification process 1 takes place followed
by process 2.
process 1 process 2
A chlorination filtration
B filtration chlorination
C fractional distillation filtration
D filtration fractional distillation
Lead reacts slowly when heated in air to form an oxide but has almost no reaction with steam.
27 Blocks of magnesium are attached to the bottom of a steel boat to prevent rusting.
Which equation describes a change that prevents the steel from rusting?
A Fe Fe3+ + 3e–
D Mg Mg2+ + 2e–
28 Which statements about the extraction of iron in a blast furnace are correct?
30 Oxides of nitrogen form in car engines and are removed by catalytic converters.
A CO + NO2 NO + CO2
C CO2 + NO NO2 + CO
A displayed
B empirical
C general
D structural
A B
H H O H H H O
H C C C H C C C C
H H OH H H H OH
C D
H H H H H H H
H C C C OH H C C C C OH
H H H H H H H
A C4H10 + Cl 2 C4H8Cl 2 + H2
C C4H10 + Cl 2 2C2H5Cl + H2
alkene alkane
A P only Q and R
B Q only P and R
C P and Q R only
D P and R Q only
O H H H H O H H H H H H H H
C C C C C C N C C C C C C N
H O H H H H O H H H H H H H H H
38 Dilute hydrochloric acid is titrated into a conical flask containing sodium hydroxide solution and a
few drops of methyl orange indicator.
A beaker
B burette
C measuring cylinder
D pipette
4.5 cm
solvent front
4.7 cm
6.0 cm
baseline
1.8 cm
40 Element X burns in air to form an acidic gas that decolourises potassium manganate(VII).
What is X?
A carbon
B nitrogen
C magnesium
D sulfur
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To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced online in the Cambridge
Assessment International Education Copyright Acknowledgements Booklet. This is produced for each series of examinations and is freely available to download
at www.cambridgeinternational.org after the live examination series.
Cambridge Assessment International Education is part of Cambridge Assessment. Cambridge Assessment is the brand name of the University of Cambridge
Local Examinations Syndicate (UCLES), which is a department of the University of Cambridge.
© UCLES 2023
I II III IV V VI VII VIII
1 2
H He
hydrogen helium
Key 1 4
3 4 atomic number 5 6 7 8 9 10
Li Be atomic symbol B C N O F Ne
lithium beryllium name boron carbon nitrogen oxygen fluorine neon
7 9 relative atomic mass 11 12 14 16 19 20
11 12 13 14 15 16 17 18
Na Mg Al Si P S Cl Ar
sodium magnesium aluminium silicon phosphorus sulfur chlorine argon
23 24 27 28 31 32 35.5 40
19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36
K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr
potassium calcium scandium titanium vanadium chromium manganese iron cobalt nickel copper zinc gallium germanium arsenic selenium bromine krypton
39 40 45 48 51 52 55 56 59 59 64 65 70 73 75 79 80 84
37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54
Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe
rubidium strontium yttrium zirconium niobium molybdenum technetium ruthenium rhodium palladium silver cadmium indium tin antimony tellurium iodine xenon
16
85 88 89 91 93 96 – 101 103 106 108 112 115 119 122 128 127 131
55 56 57–71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86
0620/23/M/J/23
lanthanoids
Cs Ba Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn
caesium barium hafnium tantalum tungsten rhenium osmium iridium platinum gold mercury thallium lead bismuth polonium astatine radon
133 137 178 181 184 186 190 192 195 197 201 204 207 209 – – –
87 88 89–103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118
actinoids
Fr Ra Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og
francium radium rutherfordium dubnium seaborgium bohrium hassium meitnerium darmstadtium roentgenium copernicium nihonium flerovium moscovium livermorium tennessine oganesson
– – – – – – – – – – – – – – – – –
57 58 59 60 61 62 63 64 65 66 67 68 69 70 71
lanthanoids La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
lanthanum cerium praseodymium neodymium promethium samarium europium gadolinium terbium dysprosium holmium erbium thulium ytterbium lutetium
139 140 141 144 – 150 152 157 159 163 165 167 169 173 175
89 90 91 92 93 94 95 96 97 98 99 100 101 102 103
actinoids Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr
actinium thorium protactinium uranium neptunium plutonium americium curium berkelium californium einsteinium fermium mendelevium nobelium lawrencium
– 232 231 238 – – – – – – – – – – –
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The volume of one mole of any gas is 24 dm3 at room temperature and pressure (r.t.p.).