Chemistry 0620/11 October/November 2023: question paper and mark scheme

Question

The three rectangles show the arrangements of the particles in each of the three states of matter. X, Y and Z represent the processes needed to change from one state to another. Y X Z What are the processes X, Y and Z? X Y Z A melting condensing evaporating B evaporating melting freezing C melting freezing condensing D freezing evaporating condensing

Question

Which substance is a pure compound? A air B brass C ethanol D petroleum

Question

The Group I element potassium forms an ionic bond with the Group VII element fluorine. Which two ions are produced? A K+ and F+ B K+ and F– C K– and F– D K– and F+

Question

An isotope of lithium has the symbol 73 Li. What is the arrangement of electrons in one atom of this isotope of lithium? A B C D

Question

Fluorine, F2, is in the same group of the Periodic Table as chlorine, Cl 2. Which diagram represents the arrangement of the outer-shell electrons in a molecule of fluorine? A B F F F F C D F F F F

Question

Which use of graphite depends on the layers of carbon atoms being able to slide over each other? A cutting tools B electrodes C jewellery D lubricant

Question

Which equations are balanced? 1 Fe2O3 + 3CO → 2Fe + 3CO2 2 ZnCO3 + 2HCl → ZnCl 2 + CO2 + 2H2O 3 Mg(NO3)2 + NaOH → Mg(OH)2 + 2NaNO3 4 CaCO3 + H2SO4 → CaSO4 + H2O + CO2 A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

Question

The equation for the combustion of methane is shown. CH4 + 2O2 → CO2 + 2H2O Which mass of methane produces 36 g of water? A 16 g B 18 g C 32 g D 64 g

Question

What is produced at each electrode during the electrolysis of aqueous solutions using inert electrodes? positive electrode (anode) negative electrode (cathode) A metals or hydrogen non-metals only B metals or oxygen non-metals only C non-metals only metals or hydrogen D non-metals only metals or oxygen

Question

Which statement about a hydrogen-oxygen fuel cell in a car is correct? A The fuel cell produces heat, which powers the car. B The fuel cell is supplied with hydrogen directly from the air. C The only emission from the fuel cell is nitrogen gas, which is non-polluting. D The fuel cell produces electricity, which powers an electric motor.

Question

The reaction pathway diagram for a reaction is shown. products energy reactants progress of reaction Which statements are correct? 1 The reaction is exothermic. 2 The reaction is endothermic. 3 The temperature of the surroundings increases. 4 The temperature of the surroundings decreases. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

Question

Which process involves a chemical change? A adding sodium to water B boiling water C dissolving sodium chloride in water D producing water from aqueous sodium chloride

Question

An experiment is carried out to find the rate of reaction between hydrochloric acid and zinc. Zn(s) + 2HCl (aq) → ZnCl 2(aq) + H2(g) The results of the experiment are shown. y-axis 0 0 time What is the label on the y-axis? A amount of ZnCl 2 produced B concentration of HCl C mass of Zn reacted D volume of H2 produced

Question

Solid S changes colour from white to blue when water is added. What is S? A anhydrous cobalt(II) chloride B anhydrous copper(II) sulfate C hydrated cobalt(II) chloride D hydrated copper(II) sulfate

Question

Which equation shows the reduction of copper? A CuO + C → Cu + CO B 2CuS + 3O2 → 2CuO + 2SO2 C Cu(g) → Cu(l) D Cu(l) → Cu(s)

Question

Which solids react with dilute sulfuric acid to form aqueous magnesium sulfate? 1 magnesium 2 magnesium hydroxide 3 magnesium nitrate 4 magnesium oxide A 1, 2 and 4 B 1 and 3 C 2, 3 and 4 D 2 and 4 only

Question

Which statements about an aqueous acid are correct? 1 Ammonia is formed when solid ammonium nitrate is added to an aqueous acid. 2 Effervescence is seen when sodium carbonate is added to an aqueous acid. 3 Methyl orange becomes yellow when added to an aqueous acid. 4 Red litmus remains red when added to an aqueous acid. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

Question

Copper(II) sulfate is formed by reacting excess solid copper(II) carbonate with dilute sulfuric acid. Which processes are part of the preparation of solid copper(II) sulfate? 1 crystallisation 2 distillation 3 filtration 4 titration A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

Question

Element X forms ions with the formula X2–. Which row describes element X? group number type of element A II metal B II non-metal C VI metal D VI non-metal

Question

Which compound is likely to be coloured? A KMnO4 B KNO3 C K2CO3 D K2SO4

Question

Chlorine, bromine and iodine are in the same group of the Periodic Table. Which statements about these three elements are correct? 1 Iodine is more reactive than chlorine. 2 They are diatomic covalent molecules. 3 They are all gases at room temperature. 4 Their atoms have seven electrons in their outer shell. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

Question

The electronic configurations of four elements, P, Q, R and S, are shown. electronic element configuration P 2 Q 2,2 R 2,6 S 2,8 Which elements are unreactive monatomic gases? A P and Q B P and S C Q and R D S only

Question

The table shows some physical properties of four different substances. Which row describes the properties of a non-metallic element? melting point conductivity conductivity / °C when solid when melted A 63 good good B 119 poor poor C 659 good good D 808 poor good

Question

The equation shows the reaction between a halogen and the aqueous ions of another halogen. X2 + 2Y – → 2X – + Y2 What is X2 and the colour of Y –? X2 Y– A chlorine brown B chlorine colourless C iodine brown D iodine colourless

Question

Zinc oxide reacts with carbon to produce zinc. Which equation represents this reaction? A 2ZnO + C → 2Zn + CO B 2ZnO + 2C → 2Zn + 2CO2 C ZnO + C → Zn + CO D ZnO + 2C → Zn + 2CO2

Question

Iron nails are stored in an airtight container. lid air iron nails The nails begin to rust after a few days. How can the rusting of the nails be prevented? A Leave the lid off. B Replace the air with argon. C Put the container in a warm place. D Seal the container in a bag.

Question

Four substances present in the blast furnace during iron extraction are listed. 1 calcium carbonate 2 carbon dioxide 3 carbon monoxide 4 iron(III) oxide Which substances are both a reactant and a product during the reactions occurring in the blast furnace? A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

Question

Which test is used to show that a sample of water is pure? A Evaporate the water to see if any solids remain. B Heat the water to check its boiling point. C Test with anhydrous cobalt(II) chloride. D Use universal indicator paper to check its pH.

Question

Which mixture of salts produces an NPK fertiliser? A ammonium phosphate + potassium sulfate B calcium phosphate + sodium nitrate C potassium nitrate + calcium sulfate D sodium phosphate + ammonium nitrate

Question

What are the main products obtained by the fractional distillation of liquid air? A carbon dioxide and oxygen B carbon dioxide and water vapour C nitrogen and oxygen D nitrogen and water vapour

Question

In which reaction is the rate of reaction increased by light? A carbon dioxide + water → glucose + oxygen B ethanoic acid + sodium carbonate → sodium ethanoate + water + carbon dioxide C ethene + bromine → dibromoethane D methane + oxygen → carbon dioxide + water

Question

The structures of three organic molecules are shown. H H O H H H H C O H H C C O H H C C C O H H H H H H Which description of the three molecules is correct? they all have they all belong the same general to the same formula, CnH2n+1OH homologous series A no no B no yes C yes no D yes yes

Question

Petroleum is separated into fractions by fractional distillation. Which row describes a use of the named fraction? fraction use A bitumen fuel for ships B refinery gas jet fuel C fuel oil road making D gasoline fuel for cars

Question

Which statement about alkanes is correct? A They are saturated. B They are very reactive. C They contain carbon, hydrogen and oxygen only. D They contain double bonds.

Question

What is the approximate volume of nitrogen in 200 cm3 of air? A 20 cm3 B 40 cm3 C 80 cm3 D 160 cm3

Question

The apparatus used to investigate the rate at which hydrogen gas is given off when a piece of magnesium reacts with dilute hydrochloric acid is shown. hydrogen gas magnesium and dilute hydrochloric acid water Which additional piece of apparatus is needed to determine the rate of reaction? A balance B burette C stop-watch D volumetric pipette

Question

Which diagram shows the displayed formula of ethanol? A B H O H H H H C C O H H C C C O H H H H H C D H H H H O H C C O H H C C C O H H H H H

Question

Ethane is used as a fuel. Which equation shows the complete combustion of ethane? A 2C2H6 + 7O2 → 4CO2 + 6H2O B 2C2H6 + 5O2 → 4CO + 6H2O C C2H4 + 3O2 → 2CO2 + 2H2O D C2H4 + 2O2 → 2CO + 2H2O

Question

The equation for the reaction of aqueous calcium nitrate and aqueous sodium hydroxide is shown. Ca(NO3)2(aq) + 2NaOH(aq) → Ca(OH)2(s) + 2NaNO3(aq) Which process is used to remove calcium hydroxide from the mixture? A chromatography B crystallisation C distillation D filtration

Question

The results of two tests on aqueous compound X are given. test result warm with aluminium foil and ammonia is produced aqueous sodium hydroxide aqueous sodium hydroxide brown precipitate What is X? A iron(III) nitrate B iron(II) nitrate C iron(III) sulfate D iron(II) sulfate 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.).