Chemistry 0620/11 October/November 2021: question paper and mark scheme

Question

Decane has a freezing point of –30 °C and a boiling point of 174 °C. A small sample of decane is placed in an open beaker in an oven at a temperature of 120 °C and at atmospheric pressure for 24 hours. What happens to the sample of decane? A It boils. B It evaporates. C It melts. D It sublimes.

Question

A student put exactly 25.00 cm3 of dilute hydrochloric acid into a conical flask. The student added 2.5 g of solid sodium carbonate and measured the change in temperature of the mixture. Which apparatus does the student need to use? A balance, measuring cylinder, thermometer B balance, pipette, stopwatch C balance, pipette, thermometer D burette, pipette, thermometer

Question

A student separates sugar from pieces of broken glass by dissolving the sugar in water and filtering off the broken glass. filtrate What is the filtrate? A broken glass only B broken glass and sugar solution C pure water D sugar solution

Question

Two isotopes of carbon are 12C and 14C. Which statement about these two isotopes is correct? A Their electronic structure is different. B They have different numbers of nucleons. C They have different numbers of protons. D They have the same number of neutrons.

Question

Which description of brass is correct? A alloy B compound C element D non-metal

Question

The element livermorium, Lv, was discovered in the year 2000. Which statement predicts what will happen to an Lv atom when it forms an Lv2– ion? A The atom will gain two electrons. B The atom will lose two electrons. C The atom will lose two protons. D The atom will gain two protons.

Question

Which substance is a diatomic covalent compound? A Cl 2 B HCl C H2O D MgO

Question

Which statement about carbon is correct? A Diamond and graphite both have simple molecular structures. B Diamond and graphite are both used to make cutting tools. C Each carbon atom in diamond is bonded to three other carbon atoms. D Graphite conducts electricity and has a giant covalent structure.

Question

The formula of sodium chlorate(V) is NaCl O3. What is the relative formula mass of sodium chlorate(V), NaCl O3? A 52.0 B 74.5 C 106.5 D 223.5

Question

Which statements about the products of electrolysis, using inert electrodes, are correct? 1 When molten lead(II) bromide is electrolysed, bromine is formed at the cathode. 2 When dilute sulfuric acid is electrolysed, oxygen is formed at the anode. 3 When concentrated aqueous sodium chloride is electrolysed, sodium is formed at the cathode. 4 When concentrated hydrochloric acid is electrolysed, chlorine is formed at the anode. A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

Question

The temperature decreases when aqueous ethanoic acid reacts with solid sodium carbonate to form a salt. Which type of reaction and energy change occur? type of reaction energy change A neutralisation endothermic B neutralisation exothermic C redox endothermic D redox exothermic

Question

Which gas is used as a fuel? A helium B hydrogen C nitrogen D oxygen

Question

Solid copper(II) carbonate reacts with dilute sulfuric acid. CuCO3 + H2SO4 → CuSO4 + CO2 + H2O The rate of the reaction can be changed by varying the conditions. Which changes always increase the rate of this chemical reaction? 1 increasing the concentration of sulfuric acid 2 increasing the size of the pieces of copper(II) carbonate 3 increasing the temperature 4 increasing the volume of sulfuric acid A 1, 3 and 4 B 1 and 3 only C 2 and 3 D 3 and 4 only

Question

Some changes are shown in the table. In which rows are the changes described correctly? chemical change physical change 1 rusting iron melting ice 2 burning ethanol evaporating ethanol 3 melting iron evaporating ethanol 4 cracking hydrocarbons burning methane A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

Question

X is a pink solid. Y is a blue solid. When X is heated, water is produced and the solid turns blue. When water is added to Y, the solid turns pink. What are X and Y? X Y A anhydrous cobalt(II) chloride hydrated cobalt(II) chloride B hydrated cobalt(II) chloride anhydrous cobalt(II) chloride C anhydrous copper(II) sulfate hydrated copper(II) sulfate D hydrated copper(II) sulfate anhydrous copper(II) sulfate

Question

Carbon reacts with carbon dioxide as shown. CO2 + C → 2CO Which statement about this reaction is correct? A Carbon dioxide and carbon are both oxidised. B Carbon dioxide and carbon are both reduced. C Carbon dioxide is reduced and carbon is oxidised. D Carbon dioxide is oxidised and carbon is reduced.

Question

Which substances do not produce water as a product when they are reacted together? A calcium hydroxide and ammonium chloride B calcium carbonate and dilute hydrochloric acid C copper(II) oxide and dilute nitric acid D zinc and dilute sulfuric acid

Question

The surface of magnesium ribbon reacts with the air to form magnesium oxide. Which statement explains why the layer of magnesium oxide is removed by dilute hydrochloric acid? A Magnesium is a base. B Magnesium ribbon reacts with hydrochloric acid. C Magnesium oxide is a base. D Magnesium oxide is an acid.

Question

Copper(II) chloride crystals are made by adding solid copper(II) carbonate to dilute hydrochloric acid until no more dissolves. Which process is used to obtain pure copper(II) chloride crystals from the mixture? A distillation of the mixture B evaporation of the mixture C filtration followed by drying of the residue D filtration followed by evaporation of the filtrate

Question

Which statement about aqueous sodium hydroxide is correct? A When it is added to a solution containing sulfate ions, a white precipitate is formed. B When it is added to a solution of copper(II) ions, a blue precipitate is formed which dissolves in excess to give deep blue solution. C When it is added to a solution of iron(II) ions, a green precipitate is formed which does not dissolve in excess. D When it is added to ammonium chloride, a gas is produced which turns blue litmus red.

Question

A period of the Periodic Table is shown. group I II III IV V VI VII VIII element R S T V W X Y Z The letters are not their chemical symbols. Which statement is correct? A Element R does not conduct electricity. B Elements R and Y react together to form an ionic compound. C Element Z exists as a diatomic molecule. D Element Z reacts with element T.

Question

What are the products of the reaction between sodium and water? A hydrogen and sodium hydroxide B hydrogen and sodium oxide C oxygen and sodium hydroxide D oxygen and sodium oxide

Question

Element X has a high density, a high melting point and a high electrical conductivity. It forms many coloured compounds. Element X and many of its compounds act as catalysts. What could be the atomic number of X? A 19 B 26 C 33 D 35

Question

The noble gases are in Group VIII of the Periodic Table. Which statement explains why noble gases are unreactive? A They all have eight electrons in their outer shells. B They all have full outer shells. C They are all gases. D They are all monoatomic.

Question

Which statement is correct for all metals? A They conduct electricity when molten. B They gain electrons when they form ions. C They have a low density. D They have a low melting point.

Question

Which statement about the extraction of metals is correct? A Aluminium is extracted from the ore bauxite by electrolysis. B Aluminium is extracted from the ore hematite by electrolysis. C Iron is extracted from the ore bauxite by electrolysis. D Iron is extracted from the ore hematite by electrolysis.

Question

Which row identifies a use of mild steel and a use of stainless steel? mild steel stainless steel A chemical plant and cutlery car bodies and machinery B car bodies and chemical plant machinery and cutlery C machinery and chemical plant car bodies and cutlery D car bodies and machinery chemical plant and cutlery

Question

The diagrams show some uses of water in the home. 1 2 3 For which uses is it important for the water to have been treated? A 1 only B 2 only C 3 only D 1, 2 and 3

Question

Which air pollutants can cause damage to buildings made of limestone? 1 carbon monoxide 2 lead compounds 3 oxides of nitrogen 4 sulfur dioxide A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

Question

Which statement about fertilisers is correct? A Ammonium sulfate, (NH4)2SO4, is a better fertiliser than ammonium nitrate, NH4NO3, because it contains more oxygen. B Ammonium phosphate, (NH4)3PO4, is a good fertiliser because it contains hydrogen. C Potassium nitrate, KNO3, is a good fertiliser because it provides potassium and nitrogen. D Urea, (NH2)2CO, is a good fertiliser because it contains carbon.

Question

Sulfur burns to make sulfur dioxide. Which row describes a source of sulfur and a use of sulfur dioxide? source of sulfur use of sulfur dioxide A the air food preservative B the air treating acidic soils C underground deposits food preservative D underground deposits treating acidic soils

Question

Lime (calcium oxide) is used to treat waste water from a factory. Which substance is removed by the lime? A ammonia B sodium chloride C sodium hydroxide D sulfuric acid

Question

Which compound is correctly named? A B C D ethane ethanoic acid methene ethene H H H O H H H C C H C C H C H H C C H H H H OH H H H

Question

Fuel X produces carbon dioxide and water when it is burned in air. So does fuel Y. What could X and Y be? X Y A C H2 B C C8H18 C CH4 H2 D CH4 C8H18

Question

Which hydrocarbon is the main constituent of natural gas? A butane B ethane C methane D propane

Question

Which statements about ethene are correct? 1 It contains a C=C bond. 2 It does not decolourise bromine water. 3 Its molecules can join together to form long chain compounds. A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

Question

Part of the structure of a very large molecule is shown. H OH H H H OH H H C C C C C C C C H H H OH H H H OH Which term describes the small unit used to make this molecule? A hydrocarbon B monomer C polymer D saturated

Question

What is the total number of single covalent bonds in a molecule of ethanol? A 5 B 6 C 7 D 8

Question

Which statement about aqueous ethanoic acid is correct? A It reacts with magnesium to produce a salt and hydrogen. B It reacts with sodium hydroxide to produce a salt and hydrogen. C It reacts with ammonium salts to produce ammonia. D It turns red litmus blue.

Question

Three statements about synthetic polymers are listed. 1 Man-made fibres are used for making clothing. 2 Plastics can cause pollution problems both on land and at sea. 3 Plastics which do not rot away are described as non-biodegradable. Which statements are correct? A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3 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 12 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.).