Chemistry 0620/13 May/June 2023: question paper and mark scheme

Question

Nitrogen is heated in a balloon, which expands slightly. Which statements about the molecules of nitrogen are correct? 1 They move further apart. 2 They move more quickly. 3 They remain the same distance apart. 4 Their speed remains unchanged. A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

Question

The diagrams represent some elements, compounds and mixtures. 1 2 3 4 Which row describes the numbered substances? 1 2 3 4 A element mixture of compounds compound mixture of elements B compound mixture of compounds element mixture of elements C element mixture of elements compound mixture of compounds D compound mixture of elements element mixture of compounds

Question

Two atoms, X and Y, have the same mass number but different atomic numbers. Which statement about X and Y is correct? A They have the same number of protons. B They have the same number of electrons. C They are in the same group of the Periodic Table. D They have different numbers of neutrons.

Question

The symbols for two different isotopes of element S are shown. m p nS qS The letters m, n, p and q represent whole numbers. Which statements about the values of m, n, p and q are correct? 1 m=p 2 n=q 3 m>q A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

Question

Which statement about potassium fluoride is correct? A It can conduct electricity when it is solid. B It dissolves in water. C It has a low melting point. D It is a molecule.

Question

In which molecule are all the outer-shell electrons involved in covalent bonding? A Cl 2 B CH4 C HCl D NH3

Question

What is the formula of potassium oxide? A P2O B PO2 C KO D K2O

Question

The compound magnesium nitrate has the formula Mg(NO3)2. What is the relative formula mass of magnesium nitrate? A 86 B 134 C 148 D 172

Question

Dilute sulfuric acid is electrolysed using inert electrodes. What is produced at the anode? A hydrogen B oxygen C sulfur D sulfur dioxide

Question

The flow diagram represents a hydrogen–oxygen fuel cell. input 1 output 1 fuel cell input 2 output 2 Which row shows the inputs and outputs? input 1 input 2 output 1 output 2 A electricity electrolyte hydrogen oxygen B electricity water hydrogen oxygen C fuel hydrogen water electricity D fuel oxygen water electricity

Question

Which statement describes an exothermic reaction? A Thermal energy is transferred to the surroundings leading to a decrease in the temperature of the surroundings. B Thermal energy is transferred to the surroundings leading to an increase in the temperature of the surroundings. C Thermal energy is taken in from the surroundings leading to an increase in the temperature of the surroundings. D Thermal energy is taken in from the surroundings leading to a decrease in the temperature of the surroundings.

Question

Which row shows the changes that all increase the rate of a chemical reaction? concentration temperature particle size of reactants A decrease decrease decrease B decrease increase increase C increase decrease increase D increase increase decrease

Question

A student heats hydrated copper(II) sulfate. The blue crystals change to a white powder. How can the student reverse this reaction? A Add anhydrous copper(II) sulfate to the white powder. B Add water to the white powder. C Cool the white powder. D Reheat the white powder.

Question

Acidified aqueous potassium manganate(VII) is a purple solution. What does the (VII) in the name potassium manganate(VII) represent? A the charge on the potassium ion B the charge of the manganate ion C the number of ions in the compound D the oxidation number of manganese

Question

Excess hydrochloric acid is added to aqueous sodium hydroxide containing thymolphthalein. Which colour change is observed? A blue to colourless B colourless to blue C red to yellow D yellow to red

Question

Information about four oxides, J, K, L and M, is listed. J releases ammonia when added to aqueous ammonium chloride. K reacts with aqueous sodium hydroxide. L is the oxide of a Group I element. M is an oxide of an element in the top right section of the Periodic Table. Which row is correct? acidic oxides basic oxides A J and K L and M B L and M J and K C K and M J and L D J and L K and M

Question

Three methods of preparing salts are listed. 1 acid + metal 2 acid + metal carbonate 3 acid + metal oxide Which methods can be used to make copper(II) chloride? A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

Question

Which set of elements shows the change from metallic to non-metallic character across a period of the Periodic Table? A beryllium → magnesium → calcium B fluorine → bromine → iodine C oxygen → boron → lithium D sodium → silicon → chlorine

Question

The diagram shows the reaction that occurs when potassium is dropped into water. 2K + 2H2O → 2KOH + H2 lilac flame water potassium Which row is correct? density of pH of resulting potassium solution A high above 7 B high below 7 C low above 7 D low below 7

Question

Which statement about bromine is correct? A Bromine has a greater density than chlorine. B Bromine is a gas at room temperature and pressure. C Bromine has a grey-black colour. D Bromine is less reactive than iodine.

Question

What is a typical property of transition elements? A can act as catalysts B poor electrical conductivity C low melting point D low density

Question

Which description of elements in Group VIII of the Periodic Table is correct? A They are diatomic. B All atoms have eight outer electrons. C They have high melting points. D They are unreactive.

Question

The flow chart shows some properties of four solid elements. Does it react with water to produce hydrogen? no yes element 1 Does it conduct electricity? no yes element 2 Does it break into pieces when struck with a hammer? no yes element 3 element 4 Which elements are non-metals? A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

Question

Which statement about copper or aluminium is correct? A Aluminium is more dense than copper. B Aluminium is less reactive than copper. C Copper has high ductility. D Copper has poor electrical conductivity.

Question

Water from a reservoir flows to the water works where purification process 1 takes place followed by process 2. What are processes 1 and 2? process 1 process 2 A chlorination filtration B filtration chlorination C fractional distillation filtration D filtration fractional distillation

Question

Calcium reacts with cold water to produce hydrogen. Lead reacts slowly when heated in air to form an oxide but has almost no reaction with steam. Silver does not react with either air or water. Zinc reacts when heated with steam to produce hydrogen. What is the order of reactivity starting with the least reactive? least reactive most reactive A calcium lead zinc silver B calcium zinc lead silver C silver lead zinc calcium D silver zinc lead calcium

Question

Which statement about rusting is correct? A Rust is anhydrous iron(II) oxide. B Oxygen is required for iron to rust. C Iron covered in grease rusts more quickly. D Iron rusts more quickly in the absence of air.

Question

Which statements about the extraction of iron in a blast furnace are correct? 1 The temperature inside the blast furnace is increased by burning carbon. 2 Iron(III) oxide is reduced to iron by carbon monoxide. 3 The thermal decomposition of calcium carbonate forms slag. 4 Slag reacts with acidic impurities. A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

Question

Which statements about water are correct? 1 Tap water has fewer impurities than distilled water. 2 Tap water will turn anhydrous cobalt(II) chloride pink. 3 The domestic water supply is treated with carbon to kill microbes. 4 Phosphates from fertilisers can cause deoxygenation of water. A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

Question

Which substance is used by farmers to improve plant growth? A ammonium nitrate B phosphoric acid C potassium D sodium oxide

Question

Three air pollutants, X, Y and Z, are described. X is a toxic gas formed by the incomplete combustion of an alkane. Y is formed by decomposing vegetation and increases global warming. Z is a cause of breathing problems and acid rain. Which pollutants are X, Y and Z? X Y Z A carbon monoxide methane oxides of nitrogen B carbon monoxide particulates carbon dioxide C sulfur dioxide methane oxides of nitrogen D sulfur dioxide particulates carbon dioxide

Question

The displayed formula of an organic compound is shown. H H C C C H H H H To which homologous series does this compound belong? A alcohols B alkanes C alkenes D carboxylic acids

Question

Kerosene is one of the fractions of petroleum. What is kerosene used for? A jet fuel B petrol C road making D waxes

Question

A hydrocarbon P is cracked to make compound Q and hydrogen. Compound R is formed by the addition polymerisation of compound Q. To which homologous series do P, Q and R belong? alkene alkane A P only Q and R B Q only P and R C P and Q R only D P and R Q only

Question

Which process involves combustion? (Some of the reaction products are not shown on the diagram.) B carbon dioxide A sugar + yeast ethanol in water D C ethene poly(ethene)

Question

What are the products when ethanoic acid reacts with aqueous sodium hydroxide? A carbon dioxide and water B carbon dioxide and sodium ethanoate C sodium ethanoate and hydrogen D sodium ethanoate and water

Question

Which statements are correct? 1 The polymer of ethene is poly(ethane). 2 Monomers are small molecules. 3 Monomers join together to form polymers. A 1 and 3 B 1 only C 2 and 3 D 2 only

Question

Dilute hydrochloric acid is titrated into a conical flask containing sodium hydroxide solution and a few drops of methyl orange indicator. Which piece of apparatus is used to add the hydrochloric acid? A beaker B burette C measuring cylinder D pipette

Question

What could be the melting point and boiling point of water containing a dissolved impurity? melting point boiling point / °C / °C A +3 96 B +3 104 C –3 96 D –3 104

Question

Element X burns in air to form an acidic gas that decolourises potassium manganate(VII). What is X? A carbon B nitrogen C magnesium D sulfur 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.).