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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 5 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 7.
A copy of the Periodic Table is printed on page 8.
The use of an approved scientific calculator is expected, where appropriate.
A student titrates 25.0 cm3 of a sports drink, which contains an acid, with aqueous sodium hydroxide.
Which apparatus is used to add the aqueous sodium hydroxide and to measure the volume added?
On a cold morning, the warm breath of a runner forms a mist of tiny droplets of liquid water.
Which statement describes the change of state of the water?
Which row shows what the proton number and the nucleon number of an atom are?
| proton number is the number of | nucleon number is the number of | |
|---|---|---|
| A | neutrons | protons and neutrons |
| B | protons | neutrons |
| C | protons | protons and neutrons |
| D | protons and neutrons | protons |
Footballers lose sodium ions, Na+, in sweat.
A sodium atom has 11 protons and the electronic configuration 2.8.1.
Which statement describes how a sodium atom forms a sodium ion?
Four solids, W, X, Y and Z, are tested. The letters are not the chemical symbols.
| solid | melting point / °C | conducts electricity when solid | conducts electricity when molten | effect of hitting with a hammer |
|---|---|---|---|---|
| W | 714 | no | yes | breaks into pieces |
| X | 660 | yes | yes | changes shape |
| Y | 1535 | yes | yes | changes shape |
| Z | 44 | no | no | breaks into pieces |
Which two solids are metals?
Bronze, which is used to make medals, is an alloy of copper and tin.
Which diagram represents the arrangement of particles in an alloy?
The relative atomic mass, Ar, of chlorine is 35.5.
Which statement explains why this value is not a whole number?
Calcium phosphate, Ca3(PO4)2, is the main mineral in bones.
What is the relative formula mass of calcium phosphate?
Powdered chalk, which is mainly calcium carbonate, is used to mark the lines on a sports field.
Dilute hydrochloric acid is added to calcium carbonate.
Which products form?
A groundsman uses a fertiliser on a football pitch.
A student tests a solution of the fertiliser for nitrate ions.
Which row shows the test for nitrate ions and the positive result?
| test | positive result | |
|---|---|---|
| A | add dilute acid | gas that turns limewater milky (cloudy) |
| B | add dilute nitric acid, then aqueous silver nitrate | white precipitate |
| C | add dilute nitric acid, then aqueous barium nitrate | white precipitate |
| D | add aqueous sodium hydroxide and aluminium foil, then warm | gas that turns damp red litmus paper blue |
Iron weights in a gym slowly rust.
The simplified equation for the reaction of iron with oxygen is shown.
Which statement is correct?
Chlorine is added to swimming pools to kill germs.
Chlorine is in Group 17 and Period 3 of the Periodic Table.
What is the electronic configuration of a chlorine atom?
Which metal does not react with dilute hydrochloric acid?
Gold medals are made from gold, which is found in nature as the metal itself.
Iron is found only as compounds in rocks, and it is difficult to obtain from them.
Sodium is also found only as compounds in rocks, and it is much more difficult to obtain from them than iron.
What is the order of increasing reactivity of the three metals?
Hydrocarbon V has the formula C12H26 and hydrocarbon W has the formula C9H20.
Both are found in the oil used to lubricate bicycle chains.
Four statements about V and W are listed.
Which statements are correct?
An alkane molecule contains 14 atoms in total.
How many carbon atoms does the molecule contain?
The displayed formula of a hydrocarbon is shown.
What is the name of this hydrocarbon?
Which diagram shows a molecule of propanol?
Poly(ethene) is a typical plastic.
Which statement about the uses of poly(ethene) is correct?
Carbon monoxide builds up in a changing room with a faulty gas heater.
How is carbon monoxide formed?
| 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