Chemistry 0620/13 May/June 2024: question paper and mark scheme

Question

Which two processes are required to change ice into steam? A boiling and melting B boiling and freezing C condensing and melting D condensing and freezing

Question

Which row describes how the volume of a gas changes when the temperature increases, or when the pressure increases? temperature increases pressure increases A volume decreases volume decreases B volume decreases volume increases C volume increases volume decreases D volume increases volume increases

Question

Four substances in a mixture are listed. • calcium nitrate • iron(II) sulfate • oxygen • water Which statement describes the mixture? A It contains 6 elements. B It contains 3 compounds and 1 element. C It contains 2 compounds and 2 elements. D It contains 4 compounds.

Question

An ion is represented by the symbol . Which statements about this ion are correct? 1 The ion contains 8 electrons. 2 The ion contains 10 neutrons. 3 The ion contains 8 protons. A 1 and 2 B 1 and 3 C 2 only D 2 and 3

Question

What is the meaning of the term nucleon number? A the number of neutrons in the nucleus of an atom B the number of protons in the nucleus of an atom C the total number of protons and electrons in the nucleus of an atom D the total number of protons and neutrons in the nucleus of an atom

Question

Which row describes the electrical conductivity of covalent and ionic compounds when solid and when molten? covalent compounds ionic compounds conductivity conductivity conductivity conductivity when solid when molten when solid when molten A ✗ ✗ ✗ ✓ key B ✗ ✓ ✗ ✓ ✓ = good conductivity C ✓ ✓ ✗ ✗ ✗ = poor conductivity D ✗ ✓ ✓ ✓

Question

Which statement about the bonding in sodium chloride is correct? A The sodium and chlorine atoms share pairs of electrons. B The chlorine atoms give electrons to the sodium atoms to form positive and negative ions. C There is covalent bonding between sodium and chlorine. D The positive and negative ions have noble gas electronic configurations.

Question

The diagram shows the arrangement of carbon atoms in a giant covalent structure. Which row identifies the substance and describes a use of this substance? substance use of substance A diamond It is an electrode because electrons can move. B diamond It is used as a cutting tool because atoms are strongly bonded together. C graphite It is used as an insulator because electrons cannot move. D graphite It is a lubricant because atoms can slide over each other.

Question

Which statement is the correct definition for molecular formula? A an atom or group of atoms that determine the chemical properties of a compound B a structure which shows all the atoms and all the bonds in a compound C the number and arrangement of different atoms in one gram of a compound D the number and type of different atoms in one molecule of a compound

Question

A compound, T, has the formula CH3Cl. Three statements about this compound are listed. 1 A molecule of the compound contains five atoms. 2 A molecule of the compound contains five different elements. 3 The relative molecular mass of the compound is 50.5. Which statements are correct? A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

Question

Iron water taps are often electroplated with a layer of chromium. Which statements explain why iron water taps are electroplated? 1 It improves the appearance of the taps. 2 It increases the strength of the taps. 3 It prevents the corrosion of the taps. 4 It improves the electrical conductivity of the taps. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

Question

Molten caesium bromide is electrolysed using inert electrodes. Which row identifies the product at each electrode? anode cathode A bromine caesium B caesium bromine C hydrogen oxygen D oxygen hydrogen

Question

Which equation represents the overall reaction in a hydrogen–oxygen fuel cell? A 4H + O2 → 2H2O B 2H2 + O2 → 2H2O C H2 + O2 → H2O D 2H + O → H2O

Question

Which statements about endothermic reactions are correct? 1 The energy of the products is greater than the energy of the reactants. 2 The energy of the reactants is greater than the energy of the products. 3 The temperature of the surroundings increases during the reaction. 4 The temperature of the surroundings decreases during the reaction. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

Question

Which process is a physical change? A firework exploding B burning wood C chocolate melting D iron rusting

Question

Magnesium reacts with dilute hydrochloric acid, HCl, to produce hydrogen gas. Which row identifies the reaction conditions that give the fastest rate of reaction? temperature HCl concentration 3 magnesium solid in °C in mol / dm A 30 1.0 powder B 40 2.0 powder C 30 1.0 ribbon D 40 2.0 ribbon

Question

Which reaction produces a white-coloured substance? A adding water to anhydrous cobalt(II) chloride B adding water to anhydrous copper(II) sulfate C heating hydrated cobalt(II) chloride D heating hydrated copper(II) sulfate

Question

In a blast furnace, iron is extracted when iron(III) oxide reacts with carbon monoxide. The equation is shown. Fe2O3 + 3CO → 2Fe + 3CO2 Which substance is oxidised and which is reduced in this reaction? oxidised reduced A CO Fe2O3 B CO2 Fe C Fe CO2 D Fe2O3 CO

Question

Which row shows the colours of litmus and methyl orange with solutions of acids or bases? solution litmus methyl orange A acid red red B acid blue yellow C base blue red D base red yellow

Question

Aqueous sodium hydroxide is reacted with excess dilute hydrochloric acid. Which ion causes the resulting mixture to be acidic? + + – – A Na B H C OH D Cl

Question

Universal indicator is added to an aqueous solution of oxide X. The indicator changes colour from green to red. What is X? A MgO B CaO C K2O D NO2

Question

Which rows identify two aqueous salts which react together to produce a precipitate? salt 1 salt 2 1 sodium sulfate barium nitrate 2 sodium chloride barium sulfate 3 barium chloride lead(II) nitrate 4 lead(II) chloride barium nitrate A 1 and 4 B 1 and 3 C 2 and 3 D 2 and 4

Question

Which statements about elements in the Periodic Table are correct? 1 Elements in the same group have the same number of electrons in their outer shell. 2 Elements in the same period have the same number of occupied electron shells. 3 The elements are arranged in order of their atomic mass. 4 Every period contains eight elements. A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

Question

Four mixtures each contain a halogen and an aqueous sodium halide. Which row describes what happens in the mixtures shown? mixture description A iodine + sodium bromide A displacement reaction occurs because iodine is more reactive than bromine. B bromine + sodium chloride A displacement reaction occurs because chlorine is more reactive than bromine. C chlorine + sodium bromide A displacement reaction occurs because chlorine is more reactive than bromine. D bromine + sodium iodide A displacement reaction occurs because iodine is more reactive than bromine.

Question

Which row describes a transition element? density colour of 3 in g / cm chloride A 0.98 green B 0.98 white C 8.90 green D 8.90 white

Question

Which statement about the use of metals is correct? A Aluminium has a high strength and high density so is used to make aircraft. B Copper has a low melting point so is used in electrical wiring. C Aluminium is resistant to corrosion so is used in food containers. D Zinc is used to make the alloy stainless steel which is used in cutlery.

Question

Which statements explain why stainless steel is used in cutlery? 1 It is resistant to rusting. 2 It is a hard material. 3 It is a pure metal. A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

Question

Four different metals are separately mixed with an equal volume of dilute hydrochloric acid. The table shows the rate of effervescence for each metal. rate of metal effervescence calcium very high copper none iron low magnesium high What is the order of reactivity of the four metals starting with the most reactive? A iron → magnesium → calcium → copper B magnesium → calcium → copper → iron C copper → iron → magnesium → calcium D calcium → magnesium → iron → copper

Question

Which statement about the rusting of iron is correct? A The rusting of iron forms hydrated iron(II) oxide. B Barrier methods prevent rusting by excluding nitrogen and water. C A piece of iron submerged in water will not rust. D Coating with plastic is a barrier method that prevents iron rusting.

Question

Water is extracted from a river for use in a domestic water supply. Some treatments for domestic water are listed. • chlorination • sedimentation and filtration • treatment with carbon Which statement about these treatments is correct? A Filtration is used to remove soluble substances. B Treatment with carbon is used to remove unpleasant odours. C Chlorination is used to remove unpleasant tastes. D Sedimentation is used to kill microbes.

Question

A farmer knows his soil needs phosphorus and potassium. He has a choice of four fertilisers. 1 NH4NO3 2 (NH4)3PO4 3 KNO3 4 (NH2)2CO Which fertilisers should he use? A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

Question

Which strategies are useful in reducing the production of acid rain? 1 planting trees 2 using catalytic converters in motor vehicles 3 reducing livestock farming 4 using low-sulfur fuels A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

Question

The structures of four organic compounds, W, X, Y and Z, are shown. W X Y Z H H H H H H H H H H C C C H H C C C H C C O H H C C H H H H H H H H H H H Which compounds are members of the same homologous series? A W and X B W and Z C X and Y D Y and Z

Question

Which molecular formula represents an alkene? A C2H6O B C2H6 C CH4 D C3H6

Question

Which row identifies the petroleum fractions used to reduce the friction between metal parts in engines and as a fuel in cars? fraction used to reduce fraction used as a friction in engines fuel in cars A gas oil gasoline B gas oil fuel oil C lubricating oil fuel oil D lubricating oil gasoline

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Four fuels are listed. 1 ethanol 2 coal 3 hydrogen 4 natural gas Which fuels are fossil fuels? A 1, 2 and 3 B 1 and 3 only C 2 and 4 D 4 only

Question

Aqueous bromine is added to two test-tubes. Excess hexene is added to one test-tube. Excess hexane is added to the second test-tube. Which row describes the observation in each test-tube? hexene hexane A orange to colourless orange to colourless B orange to colourless remains orange C colourless to orange remains colourless D remains orange orange to colourless

Question

The structure of a compound, G, is shown. G is in the same homologous series as ethanoic acid. H H O H C C C O H H H Which row describes an aqueous solution of G? produces a gas with turns methyl orange magnesium yellow A no yes B no no C yes no D yes yes

Question

When zinc reacts with dilute sulfuric acid, hydrogen gas is produced. Which apparatus is needed to investigate the effect of temperature on the rate of this reaction? 1 thermometer 2 stop-watch 3 volumetric pipette 4 gas syringe A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

Question

Two tests are carried out on substance Z. test 1 A flame test produces a red flame. test 2 Z is dissolved in water and dilute nitric acid is added, followed by aqueous silver nitrate. A yellow precipitate is produced. What is substance Z? A lithium bromide B lithium iodide C sodium bromide D sodium 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 06_0620_13_2024_1.14 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.).