Chemistry 0620/12 May/June 2024: question paper and mark scheme

Question

Which statement about gases is correct? A Gases are difficult to compress when pressure is applied. B The particles in gases are close together. C The particles in gases have a random arrangement. D The particles in gases move slowly past each other.

Question

A sample of argon gas is heated in a closed container. Which row describes what happens to the pressure and the size of the argon atoms? pressure size A decreases increases B decreases stays the same C increases increases D increases stays the same

Question

Which statement is correct? A Air is a mixture of gaseous elements only. B Alloys are formed when a metal is ionically bonded to other elements. C Carbon dioxide is a mixture of carbon and oxygen. D Potassium bromide is an ionic compound.

Question

Which row identifies methods of testing the purity of a compound? melting point boiling point chromatography A ✓ ✓ ✓ B ✓ ✗ ✗ C ✓ ✓ ✗ D ✗ ✓ ✓

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Which row shows the number of protons, neutrons and electrons in the ion ? protons neutrons electrons A 10 8 8 B 8 10 8 C 10 8 10 D 8 10 10

Question

Isotopes of the same element have some features that are the same and some that are different. Which row shows the features that are the same and those that are different? nucleon proton number of number number outer shell electrons A ✓ ✓ ✗ key B ✗ ✓ ✓ ✓ = same C ✓ ✗ ✗ ✗ = different D ✗ ✗ ✓

Question

The electronic configurations of four atoms, W, X, Y and Z, are shown. electronic atom configuration W 2 X 2,6 Y 2,8,2 Z 2,8,6 Which atoms form an ion with a charge of 2– when they react? A W and Y B W only C X and Z D Y only

Question

Which statement about bonding is correct? A All the atoms in CH4, NH3 and H2O molecules have noble gas electronic configurations. B Calcium chloride is a covalent molecule. C Group I metals gain electrons when they bond with Group VII elements. D Oxide ions in calcium oxide are positively charged.

Question

Which statement about diamond is correct? A It is a giant covalent structure consisting of carbon atoms and each atom is bonded to four other atoms. B It is a giant covalent structure consisting of flat sheets of carbon atoms. C It is a structure held together by ionic bonds and each ion is bonded to four other ions. D It is a structure held together by ionic bonds and each ion is bonded to three other ions.

Question

Which row shows the correct formulae of lead(II) bromide and butane? lead(II) bromide butane A PbBr2 C4H8 B PbBr2 C4H10 C Pb2Br C4H8 D Pb2Br C4H10

Question

Calcium phosphate forms when calcium chloride and sodium phosphate solutions react together. x CaCl 2 + y Na3PO4 → 2Ca3(PO4)2 + 12NaCl Which values of x and y balance the equation? x y A 2 2 B 3 4 C 6 3 D 6 4

Question

What is the definition of relative molecular mass, Mr? A It is the average mass of the isotopes in a compound. B It is the sum of the atomic numbers in a compound. C It is the sum of the relative atomic masses in a compound. D It is the total number of atoms in a compound.

Question

In an experiment, a molten compound is broken down using electricity. Which row identifies the negative electrode and the general name for the molten compound being broken down? general name for negative the molten electrode compound A anode electrolysis B anode electrolyte C cathode electrolyte D cathode electrolysis

Question

Hydrogen–oxygen fuel cells can be used to power vehicles. What is produced by the fuel cells? 1 carbon dioxide 2 electricity 3 water A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

Question

Three reactions are described. 1 An acid is added to substance H. Rapid fizzing happens and the temperature decreases. 2 When substance J is ignited, it produces large quantities of heat. 3 Substance K reacts slowly with air and becomes warmer. Which reactions are endothermic? A 1, 2 and 3 B 1 and 2 only C 1 only D 2 and 3 only

Question

Which of the processes produces a physical change? A thermal decomposition of calcium carbonate B addition of sodium chloride to water C addition of magnesium to hydrochloric acid D combustion of sodium

Question

A known mass of gaseous ammonia and excess gaseous hydrogen chloride react together to make solid ammonium chloride. Line X shows the total mass of ammonium chloride produced over time. The reaction is repeated at a higher pressure. All other conditions are kept the same. Line Y shows the total mass of ammonium chloride produced over time at the higher pressure. Which diagram is correct? A B X X total mass of total mass of ammonium ammonium Y chloride Y chloride produced / g produced / g 0 0 0 time / s 0 time / s C D Y Y total mass of total mass of ammonium ammonium X chloride X chloride produced / g produced / g 0 0 0 time / s 0 time / s

Question

The equation for the hydration of anhydrous copper(II) sulfate is shown. CuSO4 + 5H2O → CuSO4•5H2O Which colour change is observed in this reaction? A blue to white B white to blue C pink to blue D blue to pink

Question

Which of the reactions show the underlined substance being reduced? 1 CuO + H2 → Cu + H2O 2 2Mg + O2 → 2MgO 3 MgO + 2HCl → MgCl2 + H2O A 1 and 2 B 1 only C 2 and 3 D 3 only

Question

Four different solutions are separately tested with blue litmus and with methyl orange. Each solution is known to be either acidic or alkaline. The results are shown. result with result with solution blue litmus methyl orange 1 red red 2 red yellow 3 blue yellow 4 blue yellow Which statement is correct? A Solutions 1 and 4 are acidic. B Solutions 1 and 2 are alkaline. C Solutions 3 and 4 are acidic. D Solutions 3 and 4 are alkaline.

Question

Which statement about sulfur dioxide or calcium oxide is correct? A Calcium oxide is an acid. B Calcium oxide turns thymolphthalein yellow. C Sulfur dioxide is a base. D Sulfur dioxide turns thymolphthalein colourless.

Question

Which substances can be used to make pure crystals of sodium sulfate? A potassium sulfate and sodium hydroxide B sodium carbonate and sulfuric acid C sodium nitrate and magnesium sulfate D sulfuric acid and sodium chloride

Question

Which statements describe changes that occur from left to right across a period of the Periodic Table? 1 The atomic number of the elements increases. 2 The metallic character of the elements decreases. 3 The physical state of the elements changes from gas to solid. A 2 only B 1 and 2 C 1 and 3 D 2 and 3

Question

Part of the Periodic Table is shown. Which element is the most reactive non-metal? C A D B

Question

An alloy contains aluminium, copper, magnesium, manganese, silver and zirconium. Which row identifies the number of transition elements in the alloy and the relative density of the transition elements compared to sodium? number of relative density of transition transition elements elements in the compared to alloy sodium A 4 higher B 4 lower C 5 higher D 5 lower

Question

Which statement about the halogens and their compounds is correct? A The colour of the element gets lighter going down Group VII. B The elements get less dense going down Group VII. C When chlorine is added to sodium iodide solution, iodine is formed. D When iodine is added to sodium bromide solution, bromine is formed.

Question

Which row describes an element in Group VIII of the Periodic Table? boiling point structure / °C A −107 diatomic B −107 monatomic C 107 diatomic D 107 monatomic

Question

Magnesium reacts with dilute hydrochloric acid. Which gas is given off in this reaction? A carbon dioxide B chlorine C hydrogen D oxygen

Question

Which statement about aluminium is correct? A Aluminium is easy to extract from its ore because it is near the bottom of the reactivity series. B Aluminium is formed when aluminium oxide is heated with carbon. C Bauxite is an important ore of aluminium. D Hematite is an important ore of aluminium.

Question

Which statement shows that a liquid is pure water? A It boils at 100 °C. B It has a pH value of 7. C It turns blue cobalt(II) chloride pink. D It turns white copper(II) sulfate blue.

Question

Which compound can be added to ammonium sulfate to make an NPK fertiliser? A (NH4)3PO4 B KNO3 C K3PO4 D CO(NH2)2

Question

Four gases found in air are listed. 1 carbon dioxide 2 carbon monoxide 3 methane 4 sulfur dioxide Which gases lead directly to global warming when their concentrations are increased? A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

Question

The structures of four organic compounds are shown. 1 2 3 4 H H H H H H H C C OH C C H C H H C H H H H H OH H Which compounds are members of the same homologous series? A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 3 and 4

Question

Which of the statements about propene are correct? 1 Propene contains only single bonds. 2 Propene decolourises aqueous bromine. 3 Propene is obtained by cracking large alkanes. 4 Propene is a hydrocarbon. A 1, 3 and 4 B 1 only C 2, 3 and 4 D 2 and 4 only

Question

Petroleum is a mixture. Which method is used to separate petroleum into its components? A chromatography B cracking C filtration D fractional distillation

Question

The equation for a reaction that produces ethanol is shown. ethene + steam → ethanol Which type of reaction does the equation represent? A addition B combustion C fermentation D polymerisation

Question

Four statements about ethene or poly(ethene) are listed. 1 Poly(ethene) is produced by an addition reaction. 2 Ethene is a monomer. 3 Poly(ethene) is a monomer. 4 Poly(ethene) decolourises aqueous bromine. Which statements are correct? A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

Question

Sea water contains dissolved sodium chloride. Which method is used to obtain pure water from sea water? A chromatography B distillation C evaporation D filtration 3

Question

Which piece of apparatus is used to measure exactly 21.4 cm of water? 3 A a 25 cm beaker 3 B a 25 cm pipette 3 C a 50 cm burette 3 D a 50 cm measuring cylinder

Question

An aqueous solution of compound M is tested. The results are shown. • a lilac colour in a flame test • a white precipitate when tested with acidified barium nitrate What is compound M? A copper(II) chloride B copper(II) sulfate C potassium carbonate D potassium 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 06_0620_12_2024_1.9 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.).