Chemistry 0620/13 May/June 2022: question paper and mark scheme

Question

Two different physical states of iodine are described. In state 1, iodine exists as I2 molecules that are widely spaced and in rapid random movement. In state 2, iodine exists as I2 molecules that are closely packed and only vibrate. Iodine can be converted directly from state 2 to form state 1. Which row about state 2 and the change from state 2 to state 1 is correct? the change from state 2 state 2 to state 1 A liquid evaporation B liquid sublimation C solid evaporation D solid sublimation

Question

A student measures the time taken for 2.0 g of magnesium to dissolve in 50 cm3 of dilute sulfuric acid. Which apparatus is essential to complete the experiment? 1 stop-clock 2 measuring cylinder 3 thermometer 4 balance A 1, 2 and 4 B 1 and 2 only C 1 and 4 only D 2, 3 and 4

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Which method is used to separate a mixture of the following liquids? liquid boiling point / °C methanol 64.5 ethanol 78.5 propan-1-ol 97.2 butan-1-ol 117.0 A crystallisation B evaporation C filtration D fractional distillation

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Paper chromatography is used to separate four different coloured inks, W, X, Y and Z, and an unknown ink T. The chromatogram is shown. solvent front baseline W X Y Z T Which inks are present in ink T? A W and X B W and Y C X and Z D Y and Z

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Which row identifies an alloy, a pure metal and a non-metal? alloy pure metal non-metal A brass carbon copper B brass copper carbon C copper brass carbon D copper carbon brass

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An atom of an element contains 4 electrons, 4 protons and 6 neutrons. In which group of the Periodic Table is this element placed? A Group II B Group IV C Group VI D Group VIII

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Which row describes an ionic solid? conducts electricity conducts electricity soluble in water when solid when molten A key B = yes C = no D

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Which molecule contains more than one pair of shared electrons? A chlorine B hydrogen C hydrogen chloride D water

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Compounds that contain nitrogen can be used as fertilisers. Which compound contains the greatest proportion of nitrogen by mass? A CH4N2O B NH4Cl C NH4NO3 D (NH4)2SO4

Question

The diagram shows the electrolysis of concentrated hydrochloric acid and concentrated aqueous sodium chloride using carbon electrodes. + – + – electrode 1 electrode 2 electrode 3 electrode 4 concentrated concentrated aqueous hydrochloric acid sodium chloride At which electrodes is hydrogen produced? A electrode 1 only B electrodes 1 and 3 C electrode 2 only D electrodes 2 and 4

Question

The energy level diagram for a reaction is shown. products energy reactants progress of reaction Which statement is correct? A The reaction is endothermic and heat energy is released. B The reaction is endothermic and heat energy is taken in. C The reaction is exothermic and heat energy is released. D The reaction is exothermic and heat energy is taken in.

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Which row identifies a chemical change and a physical change? chemical change physical change A boiling ethanol burning ethanol B burning ethanol evaporating ethanol C dissolving ethanol in water burning ethanol D evaporating ethanol dissolving ethanol in water

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Metal M reacts with steam and produces gas G. Which row identifies gas G and the type of reaction when metal M reacts with steam? gas G type of reaction A hydrogen redox B hydrogen neutralisation C oxygen redox D oxygen neutralisation

Question

The rate of the reaction between lumps of zinc and dilute sulfuric acid is determined. The experiment is repeated four times, making only one change each time. The changes are listed. 1 The lumps of zinc are replaced with powdered zinc. 2 Water is added to the dilute sulfuric acid. 3 The temperature of the dilute sulfuric acid is increased. 4 A catalyst is added to the reaction mixture. Which changes produce an increase in the rate of reaction? A 1, 3 and 4 B 1 and 2 C 2 only D 3 and 4 only

Question

Water is added to anhydrous copper(II) sulfate. What happens during the reaction? A The copper(II) sulfate turns blue and the solution formed gets colder. B The copper(II) sulfate turns blue and the solution formed gets hotter. C The copper(II) sulfate turns white and the solution formed gets colder. D The copper(II) sulfate turns white and the solution formed gets hotter.

Question

Which statement explains why lime is added to soil? A to decrease the pH of acidic soil B to decrease the pH of alkaline soil C to increase the pH of acidic soil D to increase the pH of alkaline soil

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Sulfur dioxide is bubbled through water containing litmus. sulfur dioxide water and litmus Which row describes and explains what happens to the litmus? observation explanation A it turns blue sulfur dioxide is a basic oxide B it turns blue sulfur dioxide is an acidic oxide C it turns red sulfur dioxide is an acidic oxide D it turns red sulfur dioxide is a basic oxide

Question

The oxides of two elements, X and Y, are separately dissolved in water and the pH of each solution tested. oxide tested pH of solution X 1 Y 13 Which information about X and Y is correct? oxide is oxide is metal non-metal acidic basic A X Y X Y B X Y Y X C Y X X Y D Y X Y X

Question

An acid is neutralised by adding an excess of an insoluble solid base. A soluble salt is formed. How is the pure salt obtained from the reaction mixture? A crystallisation → evaporation → filtration B evaporation → crystallisation → filtration C filtration → crystallisation → evaporation D filtration → evaporation → crystallisation

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Which ion forms a precipitate that dissolves in excess with both aqueous ammonia and with aqueous sodium hydroxide? A calcium ion, Ca2+ B copper(II) ion, Cu2+ C iron(III) ion, Fe3+ D zinc ion, Zn2+

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Part of the Periodic Table is shown. Which element is a metal? A B C D

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The elements sodium to argon form Period 3 of the Periodic Table. Which row describes the trend across Period 3 from left to right? number of metallic group outer-shell electrons character number A decreases decreases decreases B decreases increases decreases C increases decreases increases D increases increases increases

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Lithium and sodium are in Group I of the Periodic Table. Which statements about the properties of lithium and sodium are correct? 1 Lithium has a lower melting point than sodium. 2 They both produce hydrogen when they react with water. 3 Lithium is less dense than sodium. 4 Lithium is more reactive than sodium. A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

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Which row describes the properties of a typical transition element? melting used as density point catalyst A high high yes B high low no C low high yes D low low no

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Which row describes an atom of a noble gas? number of number of number of protons neutrons electrons A 2 2 0 B 2 2 2 C 8 8 8 D 8 8 10

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Some properties of four elements, P, Q, R and S, are shown. Solid P reacts with dilute hydrochloric acid to give hydrogen. Solid Q does not conduct electricity. Solid R is used to make saucepans because it is a good conductor of heat. Solid S reacts with oxygen to form a compound where atoms of S share electrons with atoms of oxygen. Which elements are metals? A P and R B P and S C Q and R D Q and S

Question

Three metals, X, Y and Z, are added separately to dilute hydrochloric acid. The oxides of each metal are heated with carbon. The results of the reactions are shown. dilute aqueous metal oxide with carbon hydrochloric acid X no reaction brown solid forms Y fast fizzing no change Z slow fizzing silver coloured solid forms What are X, Y and Z? X Y Z A copper calcium zinc B copper zinc magnesium C iron calcium zinc D iron zinc magnesium

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Which uses of the metals shown are correct? aluminium stainless steel A aircraft bodies car bodies B car bodies aircraft bodies C chemical plant food containers D food containers cutlery

Question

Carbon dioxide and methane are both greenhouse gases. Which activity produces both of these gases? A farming animals B cracking alkanes C the thermal decomposition of limestone D using petrol-powered cars

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Which statement about carbon monoxide is correct? A It damages stone buildings. B It is a pollutant which causes acid rain. C It is produced during the decomposition of vegetation. D It is formed during the incomplete combustion of natural gas.

Question

Fertilisers are used to provide three of the elements needed for plant growth. Which two compounds would give a fertiliser containing all three of these elements? A Ca(NO3)2 and (NH4)2SO4 B Ca(NO3)2 and (NH4)3PO4 C KNO3 and (NH4)2SO4 D KNO3 and (NH4)3PO4

Question

Sulfur dioxide is tested by reacting it with acidified potassium manganate(VII). Which colour change is seen in the test? A blue to white B colourless to purple C purple to colourless D white to blue

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Which products use calcium carbonate in their manufacture? 1 aluminium 2 cement 3 iron 4 sulfuric acid A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

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What are the products when limestone (calcium carbonate) is heated strongly? A calcium hydroxide and carbon dioxide B calcium hydroxide and carbon monoxide C calcium oxide and carbon dioxide D calcium oxide and carbon monoxide

Question

Which structures represent ethene and ethanol? ethene ethanol H H H H A H C C H H C C O H H H H H H H H O B H C C H H C C H H H O H H H H H C C C H C C O H H H H H H H H O D C C H C C H H H O H

Question

One of the fractions obtained from the fractional distillation of petroleum is naphtha. What is a major use of the naphtha fraction? A as a fuel for jet aircraft B as a lubricant for moving machine parts C as a smooth surface covering for roads D as a starting material to make other chemicals

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Which statement describes the process of cracking? A It is the breakdown of a compound using electricity. B It is the breakdown of long chain hydrocarbons. C It is the combination of many small monomers. D It is the separation of a mixture of hydrocarbons.

Question

Which temperature range is used in the production of ethanol by fermentation? A 0–20 °C B 25–40 °C C 50–70 °C D 80–100 °C

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A hydrocarbon is tested with aqueous bromine. The aqueous bromine turns from orange to colourless. Which row describes the hydrocarbon? homologous type of series hydrocarbon A alkane saturated B alkane unsaturated C alkene saturated D alkene unsaturated

Question

Which polymers are constituents of food? 1 carbohydrate 2 nylon 3 Terylene 4 protein A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4 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 85 88 89 91 93 96 – 101 103 106 108 112 115 119 122 128 127 131 16 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 89–103 104 105 106 107 108 109 110 111 112 114 116 actinoids Fr Ra Rf Db Sg Bh Hs Mt Ds Rg Cn Fl Lv francium radium rutherfordium dubnium seaborgium bohrium hassium meitnerium darmstadtium roentgenium copernicium flerovium livermorium – – – – – – – – – – – – – 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.).