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Practice paper written from an analysis of every
O-Level Science (Chemistry) paper, 2010–2026
Paper 1 Multiple Choice (Chemistry section)
FORECAST PAPER · SET 6 Easy
For practice before the 2026 examination
30 minutes
Additional Materials: Paper for your answers, numbered 1 to 20
Write in soft pencil.
Do not use staples, paper clips, glue or correction fluid.
There are twenty 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 on a separate sheet of paper, numbered 1 to 20.
Each correct answer will score one mark. A mark will not be deducted for a wrong answer.
Any rough working should be done in this booklet.
A copy of the Data Sheet is printed on page 9.
A copy of the Periodic Table is printed on page 10.
The use of an approved scientific calculator is expected, where appropriate.
In a car engine, liquid petrol is sprayed into the hot cylinder and changes into petrol vapour.
Which row describes the particles of petrol during this change?
| energy of the particles | distance between the particles | |
|---|---|---|
| A | increases | increases |
| B | increases | decreases |
| C | decreases | increases |
| D | decreases | decreases |
Which row shows the relative charge and the approximate relative mass of a neutron?
| relative charge | relative mass | |
|---|---|---|
| A | −1 | 1 |
| B | 0 | 1/1840 |
| C | 0 | 1 |
| D | +1 | 1 |
Aluminium is used to make parts of aircraft.
An aluminium atom has 13 protons.
Which row describes how an aluminium atom forms an aluminium ion?
| change to the atom | ion has the same electronic configuration as | |
|---|---|---|
| A | gains 5 electrons | argon |
| B | gains 5 electrons | neon |
| C | loses 3 electrons | argon |
| D | loses 3 electrons | neon |
A compound of two elements, X and Y, is spread on roads in cold countries to melt ice.
The diagram shows the outer shell electrons of the ions in the compound.
The letters are not the chemical symbols.
Electrons from atoms of X are shown as crosses and electrons from atoms of Y as dots.
Which statement describes the formation of the ionic bonds in this compound?
Brass is used to make the valves of some car tyres.
Brass is an alloy.
What is an alloy?
Which substance is matched with its correct formula?
Sodium azide, NaN3, is used in some car airbags.
What is the relative formula mass, Mr, of sodium azide?
Propane is the main fuel in the liquefied petroleum gas used in some taxis.
A sample of propane contains 3.01 × 1023 molecules.
How many moles of propane are in the sample?
Dilute sulfuric acid, which is used in car batteries, is added to each of three solids.
With which solids is a gas produced?
Aqueous solution X contains one cation and one anion.
Four tests are carried out on X.
| test | method | observation |
|---|---|---|
| 1 | add aqueous sodium hydroxide until in excess | white precipitate, which dissolves in excess to give a colourless solution |
| 2 | add aqueous ammonia until in excess | white precipitate, which does not dissolve in excess |
| 3 | add dilute nitric acid, then aqueous barium nitrate | no visible change |
| 4 | add aqueous sodium hydroxide and aluminium foil, then warm | the gas given off turns damp red litmus paper blue |
What is X?
Railway tracks can be joined by pouring molten iron into the gap between them.
The iron is made by this reaction of aluminium powder with iron(III) oxide.
The oxidation state of aluminium changes from 0 to +3.
Which statement about aluminium is correct?
Magnesium is used in alloys for the wheels of some cars.
A magnesium atom has 12 protons.
In which group and period of the Periodic Table is magnesium?
Magnesium, zinc, iron and copper are all used to make parts of cars.
Which row shows these metals in order of decreasing reactivity, most reactive first?
A mechanic investigates how iron rusts.
An iron nail is placed in each of four test-tubes and left for one week.
In which test-tube does the nail rust?
Petrol is a mixture of hydrocarbons, including alkanes.
An alkane in petrol has 8 carbon atoms in each molecule.
What is the molecular formula of this alkane?
Liquefied petroleum gas (LPG) is used as a fuel in some vehicles.
It contains the compound shown.
Which row gives the name and the molecular formula of this compound?
| name | molecular formula | |
|---|---|---|
| A | propane | C3H6 |
| B | propane | C3H8 |
| C | propene | C3H6 |
| D | propene | C3H8 |
Ethene is made by cracking large hydrocarbon molecules from crude oil.
Ethene gas reacts with hydrogen gas.
What is the product of this reaction?
Bioethanol, a fuel for some cars, is made by the fermentation of glucose from sugar cane.
Four statements about this fermentation are listed.
Which statements are correct?
Waste plastic from old vehicles is burned in an open fire.
Which pollution problem does this cause?
The exhaust gases from vehicle engines contain carbon monoxide and nitrogen dioxide.
Which row describes a harmful effect of each gas?
| carbon monoxide | nitrogen dioxide | |
|---|---|---|
| A | forms acid rain | forms acid rain |
| B | forms acid rain | contributes to global warming |
| C | is toxic | forms acid rain |
| D | is toxic | contributes to global warming |
| aluminium hydroxide | white |
| calcium hydroxide | white |
| copper(II) hydroxide | light blue |
| iron(II) hydroxide | green |
| iron(III) hydroxide | red-brown |
| zinc hydroxide | white |
Group | |||||||||||||||||
1 | 2 |
| 13 | 14 | 15 | 16 | 17 | 18 | |||||||||
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| 1 H hydrogen 1 |
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| 2 He helium 4 | ||
3 Li lithium 7 | 4 Be beryllium 9 |
| proton (atomic) number atomic symbol name relative atomic mass |
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| 5 B boron 11 | 6 C carbon 12 | 7 N nitrogen 14 | 8 O oxygen 16 | 9 F fluorine 19 | 10 Ne neon 20 | ||
11 Na sodium 23 | 12 Mg magnesium 24 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 Al aluminium 27 | 14 Si silicon 28 | 15 P phosphorus 31 | 16 S sulfur 32 | 17 Cl chlorine 35.5 | 18 Ar argon 40 |
19 K potassium 39 | 20 Ca calcium 40 | 21 Sc scandium 45 | 22 Ti titanium 48 | 23 V vanadium 51 | 24 Cr chromium 52 | 25 Mn manganese 55 | 26 Fe iron 56 | 27 Co cobalt 59 | 28 Ni nickel 59 | 29 Cu copper 64 | 30 Zn zinc 65 | 31 Ga gallium 70 | 32 Ge germanium 73 | 33 As arsenic 75 | 34 Se selenium 79 | 35 Br bromine 80 | 36 Kr krypton 84 |
37 Rb rubidium 85 | 38 Sr strontium 88 | 39 Y yttrium 89 | 40 Zr zirconium 91 | 41 Nb niobium 93 | 42 Mo molybdenum 96 | 43 Tc technetium – | 44 Ru ruthenium 101 | 45 Rh rhodium 103 | 46 Pd palladium 106 | 47 Ag silver 108 | 48 Cd cadmium 112 | 49 In indium 115 | 50 Sn tin 119 | 51 Sb antimony 122 | 52 Te tellurium 128 | 53 I iodine 127 | 54 Xe xenon 131 |
55 Cs caesium 133 | 56 Ba barium 137 | 57–71 lanthanoids
| 72 Hf hafnium 178 | 73 Ta tantalum 181 | 74 W tungsten 184 | 75 Re rhenium 186 | 76 Os osmium 190 | 77 Ir iridium 192 | 78 Pt platinum 195 | 79 Au gold 197 | 80 Hg mercury 201 | 81 Tl thallium 204 | 82 Pb lead 207 | 83 Bi bismuth 209 | 84 Po polonium – | 85 At astatine – | 86 Rn radon – |
87 Fr francium – | 88 Ra radium – | 89–103 actinoids
| 104 Rf rutherfordium – | 105 Db dubnium – | 106 Sg seaborgium – | 107 Bh bohrium – | 108 Hs hassium – | 109 Mt meitnerium – | 110 Ds darmstadtium – | 111 Rg roentgenium – | 112 Cn copernicium – | 113 Nh nihonium – | 114 Fl flerovium – | 115 Mc moscovium – | 116 Lv livermorium – | 117 Ts tennessine – | 118 Og oganesson – |
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lanthanoids | 57 La lanthanum 139 | 58 Ce cerium 140 | 59 Pr praseodymium 141 | 60 Nd neodymium 144 | 61 Pm promethium – | 62 Sm samarium 150 | 63 Eu europium 152 | 64 Gd gadolinium 157 | 65 Tb terbium 159 | 66 Dy dysprosium 163 | 67 Ho holmium 165 | 68 Er erbium 167 | 69 Tm thulium 169 | 70 Yb ytterbium 173 | 71 Lu lutetium 175 |
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actinoids | 89 Ac actinium – | 90 Th thorium 232 | 91 Pa protactinium 231 | 92 U uranium 238 | 93 Np neptunium – | 94 Pu plutonium – | 95 Am americium – | 96 Cm curium – | 97 Bk berkelium – | 98 Cf californium – | 99 Es einsteinium – | 100 Fm fermium – | 101 Md mendelevium – | 102 No nobelium – | 103 Lr lawrencium – |
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The volume of one mole of any gas is 24 dm3 at room temperature and pressure (r.t.p.).
The Avogadro constant, L = 6.02 × 1023 mol-1