Chemistry 0620/13 October/November 2021: question paper and mark scheme

Question

The particles in a substance are far apart, randomly arranged and moving. The substance changes state and the particles are now close together. The particles are still randomly arranged and able to move. What is the change of state of the substance? A gas to liquid B liquid to gas C liquid to solid D solid to gas

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

The nucleus of a particular atom consists of nineteen particles. Nine of them are positively charged and ten of them are uncharged. Which statement about this nucleus is correct? A The nucleus has a nucleon number of nine. B The nucleus has a nucleon number of ten. C The nucleus has a proton number of nine. D The nucleus has a proton number of ten.

Question

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

Question

A Group I element combines with a Group VII element and forms an ionic bond. Which row shows how the electronic structures change? Group I element Group VII element before after before after bonding bonding bonding bonding A 2,8,1 2,8,2 2,7 2,6 B 2,8 2,7 2,8 2,8,1 C 2,8,1 2,8 2,7 2,8 D 2,8 2,8,1 2,8 2,7

Question

Four covalent compounds are listed. chlorine methane ammonia water Which row identifies the total number of covalent bonds in each compound? chlorine methane ammonia water A 2 4 3 2 B 1 3 2 2 C 2 3 2 3 D 1 4 3 2

Question

Magnesium reacts with dilute hydrochloric acid to produce a salt and hydrogen gas. What is the equation for this reaction? A Mg + HCl → MgCl + H B Mg + H2Cl 2 → MgCl 2 + H2 C Mg + 2HCl → MgCl 2 + H2 D Mg + 2HCl → MgCl 2 + 2H

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

Effervescence is observed at the negative electrode (cathode) during the electrolysis of concentrated aqueous sodium chloride. Which element is produced at the negative electrode (cathode)? A chlorine B hydrogen C oxygen D sodium

Question

The energy level diagram for a chemical reaction is shown. products energy reactants progress of reaction Which statement about this reaction is correct? A The reaction is endothermic and energy is given out to the surroundings. B The reaction is endothermic and energy is taken in from the surroundings. C The reaction is exothermic and energy is given out to the surroundings. D The reaction is exothermic and energy is taken in from the surroundings.

Question

Which property explains why methane is used as a fuel? A It is an alkane. B It forms carbon dioxide when it burns. C It is a gas at room temperature. D It releases heat energy when it burns.

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

Magnesium carbonate and hydrochloric acid react to form a gas. The volume of gas is measured at fixed time intervals. In experiment 1, an excess of magnesium carbonate granules reacts with 100 cm3 of hydrochloric acid. The experiment is repeated but with one change. This is experiment 2. The results are shown on the graph. experiment 1 volume of gas experiment 2 0 0 time Which change is made? A A catalyst is added. B Magnesium carbonate powder is used. C The hydrochloric acid is more concentrated. D The temperature is lower.

Question

Which colour change is observed when water is added to anhydrous cobalt(II) chloride? A blue to pink B pink to blue C blue to white D white to blue

Question

The equation for the extraction of iron from its ore is shown. Fe2O3 + 3CO → 2Fe + 3CO2 Which statement is correct? A Iron is oxidised. B Iron(III) oxide is oxidised. C Carbon monoxide is oxidised. D Carbon monoxide is reduced.

Question

Solution X is tested separately with sodium carbonate and litmus. Which row shows that X is acidic? sodium carbonate litmus A effervescence blue B effervescence red C no change blue D no change red

Question

Basic oxides are neutralised by acidic oxides. Which element forms an oxide that neutralises calcium oxide? A hydrogen B magnesium C sodium D sulfur

Question

Which method produces a pure sample of copper(II) sulfate crystals? A Add an excess of copper(II) carbonate to dilute sulfuric acid, filter and evaporate the filtrate until crystals start to appear. B Add an excess of copper(II) carbonate to dilute sulfuric acid, filter off the remaining solid and dry it in an oven at 100 °C. C Warm an excess of copper(II) oxide with dilute sulfuric acid and evaporate the mixture to dryness. D Warm an excess of copper(II) oxide with dilute sulfuric acid and filter off the crystals formed.

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

Lithium, sodium and potassium are elements in Group I of the Periodic Table. Which statement about sodium is correct? A Sodium is more dense than potassium. B Sodium reacts with water more vigorously than lithium. C Sodium has a lower melting point than potassium. D Solid sodium does not conduct electricity.

Question

Which property of transition elements is different from the properties of Group I metals? A They conduct electricity. B They are malleable. C They form coloured compounds. D They form basic oxides.

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

Chromium is a more reactive metal than iron but less reactive than zinc. Which statements are correct? 1 Chromium does not react with dilute hydrochloric acid. 2 Chromium oxide is reduced when it is heated with carbon. 3 Chromium reacts with zinc oxide to form zinc. 4 Chromium reacts with steam to form hydrogen gas. A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

Question

Some properties of copper are listed. 1 It conducts electricity. 2 It conducts heat. 3 It is ductile. 4 It has a high melting point. Which properties of copper make it useful as a cooking pan? A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

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 gas is released when slaked lime, Ca(OH)2, is added to a field that has previously been treated with ammonium sulfate fertiliser? A ammonia B carbon dioxide C nitrogen D sulfur dioxide

Question

Which reactions produce carbon dioxide? 1 heating a carbonate 2 reacting a carbonate with dilute acid 3 burning methane 4 cracking a hydrocarbon A 1, 2 and 3 B 1, 2 and 4 C 2, 3 and 4 D 3 and 4 only

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

The structures of three chemical compounds are shown. 1 2 3 H H H H H H H C C C H C OH H C C H H H H H H To which homologous series do 1, 2 and 3 belong? 1 2 3 A alkane alcohol alkene B alkene alkane alcohol C alkane alkene alcohol D alkene alcohol alkane

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

What is the main constituent of natural gas? A hydrogen B carbon monoxide C methane D nitrogen

Question

Which statement describes the members of a homologous series? A compounds with the same physical properties B compounds containing the same functional group C compounds containing the same number and type of bonds D compounds obtained from the same raw material

Question

Which monomer molecules are used to make poly(ethene)? A C2H4 B C2H6 C C3H6 D C4H8

Question

Ethanol is manufactured by the catalytic addition of steam to compound P. What is P? A ethane B ethene C methane D yeast

Question

Which property is shown by aqueous ethanoic acid? A It reacts with magnesium to form water. B It turns red litmus blue. C It reacts with copper to form hydrogen gas. D It reacts with copper(II) carbonate to form carbon dioxide gas.

Question

Which statement about polymers is correct? A All synthetic polymers rapidly break down in landfill sites. B Nylon is a natural polymer. C Proteins are non-biodegradable natural polymers. D Synthetic polymers are harmful to marine life. 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 16 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.).