Chemistry 0620/21 October/November 2024: question paper and mark scheme

Question

Which row describes the arrangement and motion of the particles in a liquid? arrangement motion A random and particles are touching moving slowly B random with space between all particles moving slowly C an ordered lattice with all particles touching moving slowly D an ordered lattice with space between all particles moving quickly

Question

Which gas has the lowest rate of diffusion at room temperature and pressure? A the gas produced when ammonium chloride is heated with aqueous sodium hydroxide B the gas which makes up approximately 78% of clean, dry air C the gas produced when sodium carbonate is added to dilute hydrochloric acid D the gas produced when zinc is added to dilute sulfuric acid

Question

Which diagram represents one helium atom? A B C D key = proton = neutron = electron

Question

The diagram shows part of an ionic lattice structure. + – + – – + – + + – + – Which compound does the diagram represent? A potassium bromide B sodium oxide C magnesium chloride D carbon monoxide

Question

Which statement about nitrogen molecules and ethene molecules is correct? A A nitrogen molecule has 2 more shared electrons than an ethene molecule. B An ethene molecule has 3 more shared electrons than a nitrogen molecule. C A nitrogen molecule has 4 more shared electrons than an ethene molecule. D An ethene molecule has 6 more shared electrons than a nitrogen molecule.

Question

Sulfur is a simple molecule with the formula S8. Which row describes and explains the melting point of sulfur? melting point explanation A high the covalent bonds between sulfur atoms are strong B high the covalent bonds between sulfur molecules are strong C low the forces of attraction between sulfur atoms are weak D low the forces of attraction between sulfur molecules are weak

Question

Which row identifies a property and an explanation of the property for both diamond and silicon(IV) oxide? property explanation of property A very hard diamond has a giant covalent structure and silicon(IV) oxide has a giant ionic structure B high melting point both have giant covalent structures with many strong bonds between the atoms C good lubricant both have layers of atoms, which can slide over each other D poor conductor both contain only non-metal elements and are simple molecules

Question

Which statement about the structure of metals explains why metals are malleable? A The electrons can move freely throughout the lattice. B The layers of metal ions can slide over each other. C The metal ions are positively charged. D There is a strong force of attraction between the metal ions and the electrons.

Question

What is the formula of iron(III) oxide? A FeO B Fe3O4 C FeO2 D Fe2O3

Question

Calcium carbonate is heated. Calcium oxide and carbon dioxide gas are formed. The equation for the reaction is shown. CaCO3 → CaO + CO2 225 kg of calcium carbonate is heated until there is no further change in mass. The yield of calcium oxide is 85 kg. What is the percentage yield? A 37.8 B 47.2 C 67.5 D 85.0

Question

The apparatus used for electrolysis is shown. d.c. power supply + – electrodes electrolyte Which statement is correct? A Copper forms at the anode in some electrolysis reactions. B Hydrogen forms at the cathode in some electrolysis reactions. C Oxygen forms at the cathode in some electrolysis reactions. D Sodium forms at the anode in some electrolysis reactions.

Question

Which statement about the electrolysis of aqueous copper(II) sulfate is correct? A When copper electrodes are used, the solution turns from blue to colourless. B When graphite electrodes are used, bubbles of gas are formed at the cathode. C When copper electrodes are used, the anode gets smaller. D When graphite electrodes are used, the colour of the solution does not change.

Question

Which statement describes an advantage of using a hydrogen–oxygen fuel cell in a car compared to a gasoline engine? A The hydrogen is difficult to store. B The hydrogen is highly flammable. C The hydrogen used is made from hydrocarbons. D The only chemical product is water.

Question

Two reaction pathway diagrams are shown. Which arrow represents the activation energy for a reaction which releases thermal energy? A energy energy C B D progress of reaction progress of reaction

Question

Which statements about the Haber process are correct? 1 A high temperature is used because the reaction is slow at room temperature. 2 A high pressure is used because there are more moles of gaseous reactants than moles of gaseous product. 3 A nickel catalyst is used to increase the rate of reaction. 4 An iron catalyst is used to increase the equilibrium yield of ammonia. A 1 and 2 B 1 and 4 C 2 and 3 D 4 only

Question

Which substance is a raw material used to manufacture sulfuric acid? A vanadium(V) oxide B sulfur C sulfur dioxide D sulfur trioxide

Question

Which colours are seen when litmus and methyl orange are added to separate samples of aqueous sodium hydroxide? litmus methyl orange A blue orange B blue yellow C purple orange D purple yellow

Question

Information about the solubility in water of four oxides is shown. Which oxide, when added to water, gives a solution with a pH less than pH 7? name of oxide solubility in water A nitrogen dioxide soluble B copper(II) oxide insoluble C silicon(IV) oxide insoluble D barium oxide soluble

Question

Copper(II) sulfate is made when copper(II) carbonate reacts with dilute sulfuric acid. CuCO3 + H2SO4 → CuSO4 + H2O + CO2 Pure copper(II) sulfate crystals are obtained. Which reagent is in excess and how are the crystals obtained? reagent in excess how the crystals are obtained A copper(II) carbonate filter and evaporate the solution to dryness B copper(II) carbonate filter, evaporate the solution to crystallising point and then cool C dilute sulfuric acid evaporate the solution to dryness D dilute sulfuric acid evaporate the solution to crystallising point and then cool

Question

Which statement about elements in Group I or Group VII of the Periodic Table is correct? A Bromine reacts with potassium chloride to produce chlorine. B Iodine is a monatomic non-metal. C Lithium has a higher melting point than potassium. D Sodium is more reactive with water than potassium.

Question

Some information about an element from Group VII of the Periodic Table is shown. melting point / °C –7 boiling point / °C 59 What is the element? A fluorine B chlorine C bromine D iodine

Question

Manganese(IV) oxide, MnO2, is a black solid. The equation for the reaction between manganese(IV) oxide and dilute hydrochloric acid is shown. MnO2 + 4HCl → MnCl 2 + 2H2O + Cl 2 The reaction produces a pale pink solution. Which properties of transition elements does this reaction show? 1 They can act as catalysts. 2 They form coloured compounds. 3 They have high melting points. 4 They have variable oxidation numbers. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

Question

Part of a steel ship is protected from rusting using a sacrificial metal. What is a suitable sacrificial metal? A copper B zinc C silver D potassium

Question

Which row gives a use for the named metal and two properties which both explain this use? metal use property 1 property 2 A aluminium aircraft construction high density resistant to corrosion B copper electrical wiring good electrical ductile conductivity C aluminium food containers resistant to not malleable corrosion D copper aircraft construction malleable low density

Question

The apparatus used for the extraction of aluminium by electrolysis is shown. carbon anode – + carbon lining solution of as cathode aluminium oxide in molten cryolite molten aluminium Which equation represents the reaction at the anode? A O + 2e– → O2– B 2O2– → O2 + 4e– C Al 3– → Al + 3e– D Al 3+ + 3e– → Al

Question

Which gas is both an element and present in clean, dry air? A argon B carbon dioxide C chlorine D water vapour

Question

Oxides of nitrogen formed in a car’s engine are removed using a catalytic converter. What happens to the oxides of nitrogen in the catalytic converter? A They are hydrated. B They are neutralised. C They are oxidised. D They are reduced.

Question

What is the equation for photosynthesis? A 6CO2 + 6H2O → C6H12O6 + 6O2 B 2CO2 + 2H2O → 2C2H5OH + 3O2 C C6H12O6 → 2CO2 + 2C2H5OH D C2H5OH + 3O2 → 2CO2 + 3H2O

Question

Four statements about members of the same homologous series are listed. 1 They have the same volatility. 2 They have the same molecular formula. 3 They have the same functional group. 4 They have the same general formula. Which statements are correct? A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

Question

Ethene reacts with steam to produce ethanol. Which row describes each compound? ethene ethanol A saturated saturated B saturated unsaturated C unsaturated saturated D unsaturated unsaturated

Question

Which process is used to make an alkene from a long-chain alkane? A combustion B condensation C cracking D polymerisation

Question

Which fraction obtained from petroleum has the lowest boiling point? A diesel oil B fuel oil C kerosene D naphtha

Question

Alkanes undergo substitution reactions with chlorine in the presence of ultraviolet light. Which equation shows a reaction of this type? A C3H6 + Cl 2 → C3H6Cl 2 B C3H8 + Cl 2 → C3H6Cl 2 + H2 C C3H8 + Cl 2 → C3H7Cl + HCl D C3H6 + Cl 2 → C3H5Cl + HCl

Question

Information about two reactions of ethene is listed. ● Reaction 1 requires a nickel catalyst. ● Reaction 2 requires an acid catalyst. Which substance reacts with ethene in each reaction? reaction 1 reaction 2 A bromine steam B bromine hydrogen C hydrogen bromine D hydrogen steam

Question

Which process converts CH3CH2OH to CH3COOH? A bacterial oxidation B fermentation C catalytic addition of steam D catalytic addition of hydrogen

Question

The structure of an ester is shown. H H O H H H C C C O C C H H H H H Which row identifies the name of the ester and the two compounds from which it is made? name compound 1 compound 2 A ethyl propanoate ethanol propanoic acid B ethyl propanoate propanol ethanoic acid C propyl ethanoate ethanol propanoic acid D propyl ethanoate propanol ethanoic acid

Question

Which statements about monomers or polymers are correct? 1 Monomers are always joined together by addition reactions. 2 A polymer can be formed from a single type of monomer. 3 A polymer can be formed by joining two different types of monomer. 4 Water is always produced when monomer molecules join together. A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

Question

The diagram shows the structure of a naturally occurring polymer, Q. H O H O N C N C N C H O What is Q? A an amino acid B nylon C a protein D PET

Question

Which row shows how the boiling point and the melting point of water change when a soluble impurity is added to the water? boiling point melting point A increases increases B decreases decreases C increases decreases D decreases increases

Question

X is a white powder. The following tests are done on X. ● When a few drops of aqueous sodium hydroxide are added to a solution of X, no precipitate is seen. ● When X is heated with aqueous sodium hydroxide, no gas is formed. ● X gives a lilac colour when put into a flame. ● When acidified aqueous silver nitrate is added to a solution of X, a yellow precipitate is seen. What is X? A ammonium bromide B ammonium iodide C potassium bromide D potassium iodide 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.).