Chemistry 0620/11 October/November 2025: question paper and mark scheme

Question

Which process describes the movement of a substance very slowly from an area of high concentration to an area of low concentration? A a liquid being frozen B a solid melting C a substance diffusing through a liquid D a substance diffusing through the air

Question

The atomic number and nucleon number of a potassium atom are shown. atomic number 19 nucleon number 39 How many protons, neutrons and electrons are in the potassium ion, K+, which is formed from this potassium atom? protons neutrons electrons A 19 20 18 B 19 20 20 C 20 19 18 D 20 19 19

Question

Magnesium is in Group II and Period 3 of the Periodic Table. Which row shows the charge on a magnesium ion and the electronic configuration of a magnesium ion? electronic charge configuration A +2 2,8 B +2 2,8,2 C –2 2,8 D –2 2,8,2

Question

Sodium is in Group I of the Periodic Table. Chlorine is in Group VII of the Periodic Table. Sodium and chlorine combine to form a compound. Which statement about the combination of sodium and chlorine atoms is correct? A Both sodium and chlorine lose electrons. B Both sodium and chlorine gain electrons. C Sodium loses electrons and chlorine gains electrons. D Sodium gains electrons and chlorine loses electrons.

Question

Strontium nitrate is an ionic compound. Cyclohexane is a covalent compound. Which row describes a property of each compound? strontium nitrate cyclohexane A conducts electricity in aqueous solution low boiling point B low melting point insoluble in water C soluble in water conducts electricity when solid D conducts electricity when solid high melting point

Question

Which element forms covalent bonds with hydrogen? A magnesium B neon C nitrogen D sodium

Question

Which statement about graphite and diamond is correct? A Diamond has a high melting point but graphite does not. B Graphite and diamond both conduct electricity. C Graphite and diamond both have giant structures. D Graphite is ionic and diamond is covalent.

Question

Carbon dioxide gas reacts with aqueous calcium hydroxide to form calcium carbonate. Which equation represents this reaction? A CO2(g) + Ca(OH)2(aq) → CaCO3(s) + H2O(l) B CO2(g) + Ca(OH)2(aq) → CaCO3(aq) + H2O(l) C 2CO2(g) + 2CaOH(aq) → 2CaCO3(s) + H2(g) D 2CO2(g) + 2CaOH(aq) → 2CaCO3(aq) + H2(g)

Question

The equation for the combustion of magnesium is shown. 2Mg + O2 → 2MgO Which mass of magnesium oxide will be formed from the complete reaction of 9.6 g of magnesium? A 8.0 g B 16.0 g C 24.0 g D 40.0 g

Question

Which row identifies the product at each electrode when molten zinc chloride is electrolysed using inert electrodes? positive negative electrode electrode A O2 Zn B Cl 2 Zn C Zn Cl 2 D Zn O2

Question

Which equation represents the reaction in a hydrogen–oxygen fuel cell? A 2H2 + O2 → 2H2O B 2H2 + 2O → 2H2O C 2H2O → 2H2 + O2 D 2H2O → 2H2 + 2O

Question

What is always produced when a fuel is burned? A carbon dioxide B carbon monoxide C oxides of nitrogen D thermal energy

Question

The reaction pathway diagram shows the energy of the reactants and products in a chemical reaction. reactants energy products progress of reaction Which row describes the enthalpy change and the type of reaction shown? description of type of reaction energy change A thermal energy is given endothermic out to the surroundings B thermal energy is given exothermic out to the surroundings C thermal energy is taken endothermic in from the surroundings D thermal energy is taken exothermic in from the surroundings

Question

Magnesium is reacted with dilute hydrochloric acid of the same concentration in four experiments using different conditions. Which reaction finished in the shortest time? A 2 g of magnesium powder in 50 cm3 of dilute HCl at 45 °C B 2 g of magnesium powder in 50 cm3 of dilute HCl at 50 °C C 2 g of magnesium ribbon in 50 cm3 of dilute HCl at 45 °C D 2 g of magnesium ribbon in 50 cm3 of dilute HCl at 50 °C

Question

Blue hydrated copper(II) sulfate produces a white solid when it is heated. The white solid turns blue when water is added. Which word describes the reaction of hydrated copper(II) sulfate? A neutralisation B oxidation C reduction D reversible

Question

Iron(III) chloride, FeCl 3, is a brown solid. What is the meaning of (III) in the name? A It is the amount of energy released when the compound was formed. B It is the rate of the reaction that formed this compound. C It is how many atoms of iron are bonded together in the compound. D It is the oxidation number of iron in the compound.

Question

What are the units of concentration? A mol / dm3 B g / dm C dm3 / mol D cm / g

Question

Which pair of reactants are both soluble in water and mix to form a precipitate? A NaCl and Mg(NO3)2 B BaSO4 and K2CO3 C CaCl 2 and NaNO3 D Pb(NO3)2 and KCl

Question

Four oxides are listed. 1 lithium oxide 2 phosphorus oxide 3 sodium oxide 4 sulfur dioxide Which oxides are basic? A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

Question

Cobalt is a typical transition element. Which statement about cobalt is correct? A Cobalt has a low density. B Cobalt has a low melting point. C Cobalt can form only colourless compounds. D Cobalt can act as a catalyst.

Question

Which diagrams show the electronic configuration for an atom of a noble gas? 1 2 3 A 1 and 2 B 1 and 3 C 2 only D 3 only

Question

Which statement describes the alloy brass? A It is a mixture of iron and nickel. B It is a mixture of iron compounds. C It is a compound of copper, zinc and non-metals. D It is a mixture of the metals copper and zinc.

Question

The results of the reaction of metals W, X, Y and Z with cold water and dilute acid are shown. metal reaction with cold water reaction with dilute acid W fizzes, gas evolved rapid fizzing, gas evolved X no observable reaction no observable reaction Y no observable reaction slow fizzing, gas evolved Z a few bubbles of gas fizzes, gas evolved What is the order of reactivity of the metals? least most reactive reactive A W Z Y X B W Y Z X C X Y Z W D X Z Y W

Question

Some methods of preventing iron from rusting are listed. 1 alloying with chromium 2 greasing 3 painting Which methods are barrier methods? A 1 and 2 B 1 and 3 C 2 and 3 D 3 only

Question

Which metal is extracted from bauxite by electrolysis? A aluminium B copper C iron D zinc

Question

Which statement about water is correct? A When water is added to solid anhydrous cobalt(II) chloride, the solid turns blue. B Water containing dissolved sodium chloride boils at a temperature greater than 100 °C. C All dissolved metal ions found in natural sources of water are beneficial to life. D Soluble impurities are removed during the sedimentation stage in the treatment of drinking water.

Question

What is the structure of ethanol? A B C D H H H H H O H H C C H C C H H C C H C C OH H H H H H OH H H

Question

Which statement about alkanes is correct? A They contain carbon, hydrogen and oxygen only. B They are saturated compounds with only single ionic bonds. C The alkanes with longer chain lengths are more volatile. D They react with chlorine in a substitution reaction.

Question

Which row identifies an adverse effect of the named pollutant? air pollutant adverse effect A methane global warming B sulfur dioxide cancer C particulates acid rain D carbon monoxide photochemical smog

Question

Which group of compounds have the same general formula? A CH4, C2H6, C3H6 B CH4, C3H6, C4H8 C C2H4, C3H6, C4H8 D C2H4, C3H8, C4H8

Question

Some fractions obtained from petroleum are listed. position collected fraction use in the fractionating column 1 gasoline waxes and polishes below refinery gas 2 bitumen making roads above kerosene 3 kerosene jet fuel below gasoline 4 refinery gas heating and cooking above gasoline Which rows are correct? A 1, 3 and 4 B 2, 3 and 4 C 3 and 4 only D 4 only

Question

Four different substances or types of substance are listed. 1 hydrogen 2 alcohols 3 alkenes 4 carboxylic acids Which substances are produced by cracking larger alkane molecules? A 1 and 3 B 1 only C 2, 3 and 4 D 2 and 4 only

Question

Which row shows the conditions used to manufacture ethanol from ethene and steam? temperature / °C pressure / kPa A 35 60 B 35 6000 C 300 60 D 300 6000

Question

Which statement about aqueous ethanoic acid is correct? A It reacts with metal carbonates to form salts, hydrogen and water. B It reacts with metal oxides to form salts and oxygen. C It reacts with reactive metals to form salts and hydrogen. D It turns damp red litmus paper blue.

Question

The equation represents a polymerisation reaction. n CH2 CH2 o CH2 CH2 n Which statements are correct? 1 The monomer is ethane. 2 The reaction is addition polymerisation. 3 The polymer does not easily decompose. A 1 and 3 B 1 only C 2 and 3 D 2 only

Question

A sample of wax is heated. It begins to melt at 45 °C and finishes melting at 49 °C. A sample of liquid is heated. It begins to boil at 141 °C and remains at 141 °C while it boils. Which conclusion can be made from these results? A Both substances are impure. B Both substances are pure. C The wax is not a pure substance and the liquid is a pure substance. D The wax is a pure substance and the liquid is not a pure substance.

Question

Four dyes, P, Q, R and S, are analysed using chromatography. Water is the solvent. The chromatogram produced is shown. solvent front baseline P Q R S Which statement about the dyes is correct? A All four dyes are impure. B The four dyes contain a total of eight different substances. C Dye R is a mixture of dye P and dye Q. D Dye S is a mixture of dye Q and one other substance.

Question

The apparatus used to separate a mixture is shown. mixture funnel filter paper What is the mixture? A aqueous calcium chloride and aqueous calcium nitrate B copper(II) hydroxide and aqueous calcium chloride C ethanol and water D sand and calcium carbonate

Question

Two different white solids are heated and the gases formed are tested. The gas from solid 1 turns damp red litmus paper blue. The gas from solid 2 relights a glowing splint. Which row identifies the gases formed from each solid? solid 1 solid 2 A ammonia hydrogen B ammonia oxygen C chlorine hydrogen D chlorine oxygen

Question

Which aqueous ion gives a blue precipitate when aqueous sodium hydroxide is added? A Ca2+ B Cr3+ C Cu2+ D Fe2+ The Periodic Table of Elements Group 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 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 – – – – – – – – – – – The volume of one mole of any gas is 24 dm3 at room temperature and pressure (r.t.p.).