Chemistry 0620/22 October/November 2022: question paper and mark scheme

Question

The rate of diffusion of three gases, ammonia, carbon dioxide and methane, is measured. What is the order of the rate of diffusion of the gases from slowest to fastest? A CO2 → NH3 → CH4 B CO2 → CH4 → NH3 C CH4 → NH3 → CO2 D NH3 → CH4 → CO2

Question

Which description of Brownian motion is correct? A random movement of particles due to bombardment by larger particles B random movement of particles due to bombardment by smaller particles C random movement of particles from a high concentration to a low concentration D random movement of particles from a low concentration to a high concentration

Question

The chromatogram obtained using four substances, J, K, L and M, is shown. solvent front baseline J K L M Which statement about M is correct? A It is a mixture of J and K only. B It is a pure substance. C It is a mixture of J, K and L. D It is a mixture of J, K and an unknown substance.

Question

Which statements about isotopes of the same element are correct? 1 They are atoms which have the same chemical properties because they have the same number of electrons in their outer shell. 2 They are atoms which have the same number of electrons and neutrons but different numbers of protons. 3 They are atoms which have the same number of electrons and protons but different numbers of neutrons. A 1 and 2 B 1 and 3 C 2 only D 3 only

Question

Which statement about solid magnesium oxide is correct? A It is a giant structure made up of magnesium and oxygen atoms bonded covalently. B It is an electrical conductor with mobile magnesium ions and oxygen ions. C Magnesium loses electrons and these electrons move freely through a lattice. D Oxygen ions and magnesium ions are attracted to each other in a giant lattice.

Question

Which molecule contains only three shared pairs of electrons? A CH3OH B Cl 2 C H2O D N2

Question

Which particles are present in the structure of metals? 1 positive ions 2 negative ions 3 shared pairs of electrons 4 mobile electrons A 1 and 2 B 1 and 4 C 2 and 3 D 2 and 4

Question

Caffeine is a stimulant found in coffee. O CH3 H 3C C N N C C H C C N O N CH3 caffeine Which formula represents caffeine? A C7H10N4O2 B C8H10N3O2 C C8H10N4O2 D C8H11N4O2

Question

Which sample does not contain a number of atoms equal to the Avogadro constant? A 14 g of nitrogen, N2 B 6 g of water, H2O C 4 g of helium, He D 28 g of carbon monoxide, CO

Question

The electrolysis of concentrated aqueous sodium chloride and molten sodium chloride is shown. + – electrode 1 + – + – electrode 2 concentrated aqueous molten sodium chloride sodium chloride What are the products at electrodes 1 and 2? electrode 1 electrode 2 A chlorine chlorine B hydrogen chlorine C hydrogen sodium D sodium sodium

Question

When an acid is added to an alkali, the temperature of the reaction mixture rises. Which words describe this reaction? A decomposition and endothermic B decomposition and exothermic C neutralisation and endothermic D neutralisation and exothermic

Question

Some properties of four fuels are shown. Which fuel is a gas at room temperature and makes two products when it burns in a plentiful supply of air? melting point boiling point fuel formula / °C / °C A hydrogen H2 –259 –253 B methane CH4 –182 –164 C octane C8H18 –57 126 D wax C31H64 60 400

Question

The electrical energy, or voltage, of two simple cells is measured. V V zinc magnesium magnesium copper electrolyte electrolyte cell 1 cell 2 statement 1 The voltage of cell 1 is greater than cell 2. statement 2 Zinc is more reactive than copper. statement 3 Magnesium is oxidised in both cells. statement 4 Magnesium atoms lose electrons to form magnesium ions. Which option is correct? A All the statements are correct. B Only statements 1 and 3 are correct. C Statement 2 is correct and explains statement 1. D Statement 4 is correct and explains statement 3.

Question

Dilute aqueous sodium chloride is electrolysed using carbon electrodes. What is the product at the anode? A carbon dioxide B hydrogen C oxygen D sodium

Question

The volume of gas given off in a chemical reaction is measured over time. The results are shown. 100 90 80 70 volume 60 of gas 50 / cm3 40 30 20 10 0 0 2 4 6 8 10 time / s At which time is the rate of reaction greatest? A 0s B 4s C 6s D 10 s

Question

Dinitrogen tetroxide, N2O4, is converted into nitrogen dioxide, NO2, in a reversible reaction. N2O4(g) 2NO2(g) The forward reaction is endothermic. Which conditions give the highest equilibrium yield of nitrogen dioxide? pressure temperature / atmospheres A 2 high B 2 low C 50 high D 50 low

Question

When magnesium is heated with zinc oxide a reaction occurs. The equation is shown. Mg + ZnO → MgO + Zn Which substance is oxidised? A magnesium B magnesium oxide C zinc D zinc oxide

Question

X and Y are oxides of two different elements. ● X reacts with water to produce aqueous solution Z. ● Z turns universal indicator paper blue. ● An aqueous solution of Y reacts with sodium carbonate to produce carbon dioxide gas. Which statement is correct? A X and Y are both the oxides of metals. B X and Y are both the oxides of non-metals. C X is the oxide of a metal and Y is the oxide of a non-metal. D X is the oxide of a non-metal and Y is the oxide of a metal.

Question

Ethanoic acid reacts with water to produce an acidic solution. Which row describes the roles of ethanoic acid and water in this reaction? ethanoic acid water A accepts a proton donates a proton B accepts an electron donates an electron C donates a proton accepts a proton D donates an electron accepts an electron

Question

Copper(II) sulfate is a soluble salt. Calcium sulfate is an insoluble salt. Which row shows suitable reactants for preparing a pure sample of the named salt? salt reactants A calcium sulfate calcium carbonate + dilute sulfuric acid B calcium sulfate aqueous calcium chloride and aqueous sodium sulfate C copper(II) sulfate copper + dilute sulfuric acid D copper(II) sulfate aqueous copper(II) chloride and aqueous sodium sulfate

Question

Strontium displaces magnesium from molten magnesium chloride. Bromine displaces iodine from aqueous potassium iodide. Which row describes the change in reactivity down both Group II and Group VII of the Periodic Table? reactivity down the group Group II Group VII A decreases decreases B decreases increases C increases decreases D increases increases

Question

Elements J and K are in the same period in the Periodic Table. J reacts with acids to produce a salt and hydrogen. K reacts with sodium to form an ionic compound. Which statement about J and K is correct? A An atom of J has more electrons than an atom of K. B J and K are both metals. C J and K are both non-metals. D J is to the left of K in the Periodic Table.

Question

Part of the Periodic Table is shown. Which element has a high density, a high melting point and forms a brown oxide? A D B C

Question

The reactions of four metals, W, X, Y and Z, are listed. ● Metal W displaces metal X from the oxide of metal X. ● Metal Y has a greater tendency to form positive ions than metal W. ● Aqueous ions of metal Z are reduced by metal X. What is the order of reactivity of the metals? least most reactive reactive A Y W X Z B Y X W Z C Z W X Y D Z X W Y

Question

Three experiments, J, K and L, are set up to investigate rusting. J K L water water water mild steel painted iron stainless steel In which experiments does rusting occur? J K L A key B = yes C = no D

Question

Silver is below copper in the reactivity series. Which row describes the reactions of silver? reaction with steam reaction with dilute hydrochloric acid A no reaction no reaction B no reaction reacts to produce hydrogen gas C reacts to produce hydrogen gas no reaction D reacts to produce hydrogen gas reacts to produce hydrogen gas

Question

Iron is galvanised by coating it in zinc. Brass is made by mixing copper with zinc. Which row gives the reasons for each of these uses of zinc? reason for galvanising iron reason for making brass A prevents corrosion produces a softer metal B prevents corrosion produces a harder metal C produces a harder metal produces a softer metal D produces a harder metal produces a harder metal

Question

The diagram shows a stage in the purification of dirty water. dirty water sand pot with holes fine gravel in bottom coarse gravel Which process does this apparatus show? A chlorination B condensation C distillation D filtration

Question

Which substance in polluted air damages stonework and kills trees? A carbon dioxide B carbon monoxide C lead compounds D sulfur dioxide

Question

Ammonium nitrate, NH4NO3, is a fertiliser and is added to fields to help crops grow. Slaked lime, Ca(OH)2, is an alkali and is added to fields to reduce the acidity of the soil. Ammonium nitrate and slaked lime should not be added to a field at the same time because they react with each other to form a gas, Z. What is Z? A ammonia B hydrogen C nitrogen D oxygen

Question

The scheme shows four stages in the conversion of sulfur to sulfuric acid. In which stage is a catalyst used? stage A sulfur stage B sulfur sulfur air dioxide air trioxide concentrated stage C sulfuric acid concentrated stage D oleum sulfuric acid water

Question

Which element has an oxide that is used as a food preservative? A helium B hydrogen C iron D sulfur

Question

Which substance gives off carbon dioxide on heating? A lime B limestone C limewater D slaked lime

Question

Which compound has the most –CH2– groups in one molecule? A butane B butanoic acid C butan-1-ol D but-1-ene

Question

Methane reacts with chlorine in the presence of ultraviolet light. Which substance is not produced in this reaction? A B C D H Cl H H H Cl H C Cl H C Cl H H

Question

Ethene reacts with both hydrogen and steam. Which row about these reactions is correct? reactant type of reaction catalyst used with ethene A hydrogen substitution phosphoric acid B hydrogen addition nickel C steam substitution phosphoric acid D steam addition nickel

Question

Which type of reaction occurs when ethanol is converted to ethanoic acid? A combustion B decomposition C neutralisation D oxidation

Question

Hydrolysis of polymer P produces the three compounds shown. H N C O H H N C O H H N C O H H O H O H O What is the structure of polymer P? H O H O A N C N C N C H O H O H O B N N C C N C H O H O H H C N C N C N N H O O O H H D C N C C N N H O

Question

Which statement about unsaturated hydrocarbons is correct? A CH3CH2CH=CHCH3 is an unsaturated hydrocarbon. B Ethene has more hydrogen atoms per molecule than ethane. C Unsaturated hydrocarbons have double bonds between carbon and hydrogen atoms. D Unsaturated hydrocarbons turn aqueous bromine from colourless to brown.

Question

The equation shows the formation of a polymer called Kevlar. n HOOC COOH + n H 2N NH2 – H2 O O O C C N N H H n Which row describes Kevlar? how the polymer is formed type of polymer A addition polymerisation polyamide B addition polymerisation polyester C condensation polymerisation polyamide D condensation polymerisation polyester 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.).