Chemistry 0620/13 October/November 2023: question paper and mark scheme

Question

Which statement about solids, liquids or gases is correct? A Solids are easy to compress. B Liquids are easy to compress. C Liquids expand to fill their container. D Gases expand to fill their container.

Question

Which substance is a mixture? A air B graphite C oxygen D water

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The structure of an atom of element X is shown. key 5p = electron 6n n = neutron p = proton What is element X? A boron B carbon C sodium D sulfur

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Sodium reacts with chlorine to form sodium chloride. Which statements describe what happens to the sodium atoms in this reaction? 1 Sodium atoms form positive ions. 2 Sodium atoms form negative ions. 3 Sodium atoms gain electrons. 4 Sodium atoms lose electrons. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

Question

Which statement about ammonia is correct? A It conducts electricity when liquid. B It contains three covalent bonds. C It has a high boiling point. D It has a giant covalent structure.

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Which row describes the structure and a use of graphite? structure use A giant covalent lubricant B giant covalent cutting tools C simple molecular lubricant D simple molecular cutting tools

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The equation represents the reaction between solid magnesium oxide and dilute hydrochloric acid to form magnesium chloride and water. MgO + 2HCl → MgCl 2 + H2O Which row shows the state symbols for hydrochloric acid, magnesium chloride and water? HCl MgCl 2 H2O A (aq) (aq) (l) B (aq) (l) (l) C (l) (aq) (aq) D (l) (l) (aq)

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What is the equation for the reaction between calcium and chlorine? A 2Ca + Cl → Ca2Cl B 2Ca + Cl 2 → Ca2Cl 2 C Ca + Cl → CaCl D Ca + Cl 2 → CaCl 2

Question

Calcium nitrate has the formula Ca(NO3)2. What is the relative formula mass, Mr, of calcium nitrate? A 102 B 150 C 164 D 204

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Dilute sulfuric acid is electrolysed using platinum electrodes. The gases produced at each electrode are collected. The gases are mixed together and ignited with a lighted splint. What is formed during this reaction? A hydrogen sulfide B sulfur dioxide C sulfuric acid D water

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Electricity is passed through molten sodium chloride using inert electrodes. What is observed at the electrodes? A A colourless gas is produced at the negative electrode. B A pale yellow-green gas is produced at the positive electrode. C A silver-coloured metal is produced at the positive electrode. D No change is observed because the electrodes are inert.

Question

Fuel cells are used as energy sources in cars. Which row gives a fuel used in a fuel cell and the products formed? fuel in a fuel cell products formed A hydrogen carbon dioxide and water B hydrogen water only C petrol carbon dioxide and water D petrol water only

Question

When water is added to anhydrous iron(III) chloride, FeCl 3, hydrated iron(III) chloride, FeCl 3•6H2O, is formed and energy is given out. FeCl 3 + 6H2O FeCl 3•6H2O Which reaction pathway diagram represents the formation of anhydrous iron(III) chloride in the reverse reaction? A B FeCl 3•6H2O FeCl 3 + 6H2O energy energy FeCl 3 + 6H2O FeCl 3•6H2O progress of reaction progress of reaction C D FeCl 3 + 6H2O FeCl 3•6H2O energy energy FeCl 3•6H2O FeCl 3 + 6H2O progress of reaction progress of reaction

Question

Which process is a chemical change? A burning carbon in air B dissolving copper(II) sulfate crystals in water C evaporating ethanol D freezing water

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Anhydrous cobalt(II) chloride is blue and turns pink when water is added. How is this reaction reversed? A adding dilute acid B filtering C heating D cooling

Question

Ethanol can be turned into ethanoic acid by passing it over hot copper(II) oxide. CH3CH2OH + 2CuO → CH3COOH + H2O + 2Cu What is this type of reaction? A precipitation B redox C thermal decomposition D neutralisation

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When heated strongly, silicon(IV) oxide reacts with carbon. SiO2 + 2C → Si + 2CO Which term describes what happens to silicon(IV) oxide? A thermal decomposition B neutralisation C oxidation D reduction

Question

Information about four solutions, P, Q, R and S, is listed. Solution P reacts with ammonium chloride to form ammonia. Solution Q reacts with sodium carbonate to form carbon dioxide. Solution R contains a high concentration of OH– ions. Solution S turns litmus red. Which solutions are alkaline? A P and Q B P and R C Q and S D R and S

Question

Which oxides are basic? 1 calcium oxide 2 sodium oxide 3 iron(II) oxide A 1, 2 and 3 B 1 and 2 only C 2 and 3 only D 3 only

Question

Which row describes the changes across a period of the Periodic Table, from left to right? number of metallic character outer-shell electrons A decreases decreases B decreases increases C increases increases D increases decreases

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Which row shows properties of an element that is in the same group of the Periodic Table as lithium? electrical density conductivity in g / cm3 A high 0.97 B high 8.93 C low 0.07 D low 3.12

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Which row describes how the properties of Group I elements change as the group is descended? melting point density reactivity A increases increases increases B increases decreases decreases C decreases increases increases D decreases decreases decreases

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The elements in Group VII include chlorine, bromine and iodine. Which statements are correct? 1 Iodine is more dense than chlorine. 2 Iodine displaces chlorine from a solution containing chloride ions. 3 Bromine is a diatomic non-metal. 4 Chlorine gas is darker in colour than bromine vapour. A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

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Cobalt is a transition element. What is a property of cobalt? A It can form coloured compounds. B It is a poor electrical conductor. C It has a low density. D It has a low melting point.

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Which statements about brass are correct? 1 It is an alloy of zinc and copper. 2 It is a compound of zinc and copper. 3 It is a mixture of zinc and copper. A 1 and 3 B 1 only C 2 and 3 D 3 only

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Aluminium is used to make containers for storing food. Which property makes it suitable for this use? A conducts heat B low density C resists corrosion D shiny surface

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Which pair of diagrams represents both a pure metal and an alloy? A B pure metal alloy pure metal alloy C D pure metal alloy pure metal alloy

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A metal M is between sodium and magnesium in the reactivity series. Which reactions occur with M and its oxide? M can be extracted M reacts with steam by heating its oxide with carbon A no no B no yes C yes no D yes yes

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The diagrams show experiments to investigate rusting of iron nails. 1 2 3 layer of oil tap salt boiled water water water In which test-tubes do the nails rust? A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 1 only

Question

Some uses of water are listed. 1 for drinking 2 in chemical reactions 3 in swimming pools 4 in washing For which uses is it necessary to chlorinate the water? A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

Question

Two tests are done on an NPK fertiliser. test 1 flame test test 2 heat with aqueous sodium hydroxide and aluminium foil Which observations are made? test 1 test 2 A green flame gas evolved which turns red litmus blue B green flame gas evolved which turns blue litmus red C lilac flame gas evolved which turns red litmus blue D lilac flame gas evolved which turns blue litmus red

Question

The gases from the engine of a car contain oxides of nitrogen. How are these oxides formed? A Nitrogen reacts with carbon dioxide. B Nitrogen reacts with carbon monoxide. C Nitrogen reacts with oxygen. D Nitrogen reacts with petrol.

Question

Which statements explain why plastics should be recycled? 1 They do not decompose when added to land fill. 2 They pollute rivers and oceans, harming wildlife. 3 They can produce toxic gases when burned. A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

Question

Unwanted vegetation is sometimes placed in a bin where it decomposes. The compost formed is used to fertilise soils. Which gas is likely to be present in a higher percentage inside the bin than in the air outside the bin? A carbon monoxide B methane C oxygen D sulfur dioxide

Question

Ethene reacts with steam and with bromine in two separate reactions. What are the products of these two reactions? A ethanoic acid and bromoethane B ethanoic acid and dibromoethane C ethanol and bromoethane D ethanol and dibromoethane

Question

Four types of reactions are listed. 1 substitution 2 combustion 3 polymerisation 4 addition Which reactions will ethane undergo? A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

Question

The flow diagram shows how poly(ethene) may be made from petroleum. 1 2 3 petroleum fuel oil ethene poly(ethene) What are stages 1, 2 and 3? 1 2 3 A cracking polymerisation fractional distillation B cracking fractional distillation polymerisation C fractional distillation cracking polymerisation D fractional distillation polymerisation cracking

Question

Magnesium reacts with dilute hydrochloric acid to produce hydrogen gas. Which pieces of apparatus are needed to determine the rate of this reaction? 1 2 3 4 A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

Question

The chromatograms of four different dyes are shown. pencil line 1 2 3 4 How many different colours are present in the four dyes? A 4 B 5 C 6 D 13

Question

The results of some tests on an aqueous solution of substance X are listed. 1 A cream precipitate is produced when adding aqueous silver nitrate. 2 Adding aqueous sodium hydroxide produces a green precipitate which dissolves in excess alkali. 3 Adding aqueous ammonia produces a green precipitate which is insoluble in excess ammonia. What is substance X? A chromium(III) bromide B chromium(III) chloride C iron(II) bromide D iron(II) chloride 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.).