Chemistry 0620/22 May/June 2022: question paper and mark scheme

Question

Which two gases will diffuse at the same rate, at the same temperature? A carbon monoxide and carbon dioxide B carbon monoxide and nitrogen C chlorine and fluorine D nitrogen and oxygen

Question

A student measures the time taken for 2.0 g of magnesium to dissolve in 50 cm3 of dilute sulfuric acid. Which apparatus is essential to complete the experiment? 1 stop-clock 2 measuring cylinder 3 thermometer 4 balance A 1, 2 and 4 B 1 and 2 only C 1 and 4 only D 2, 3 and 4

Question

A chromatogram of a single substance T is shown. solvent front 3 1 4 2 baseline Which measurements are used to find the Rf value of T? A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

Question

X and Y are two different elements. X and Y have the same number of nucleons. Which statement about X and Y is correct? A They have the same physical properties. B Their atoms have the same number of electrons. C They are in different groups of the Periodic Table. D They have different relative masses.

Question

The diagrams show the structures of three macromolecules P, Q and R. P Q R What are P, Q and R? P Q R A diamond silicon(IV) oxide graphite B graphite diamond silicon(IV) oxide C silicon(IV) oxide diamond graphite D silicon(IV) oxide graphite diamond

Question

Which dot-and-cross diagram shows the arrangement of outer shell electrons in a molecule of hydrogen chloride? A B C D H Cl H Cl H Cl H Cl

Question

The equation for the reaction between barium chloride and dilute sulfuric acid is shown. BaCl 2 + H2SO4 → BaSO4 + 2HCl Which row shows the state symbols for this equation? BaCl 2 H2SO4 BaSO4 2HCl A (aq) (aq) (s) (aq) B (aq) (l) (s) (aq) C (l) (aq) (s) (l) D (aq) (l) (aq) (l)

Question

Methane and steam react in the presence of a catalyst. CH4(g) + H2O(g) → CO(g) + 3H2(g) 0.5 mol of methane reacts completely with 0.5 mol of steam. What is the volume of carbon monoxide and hydrogen produced, measured at room temperature and pressure? volume volume of CO / dm3 of H2 / dm3 A 0.5 1.5 B 1.0 3.0 C 12.0 12.0 D 12.0 36.0

Question

A compound of element X has the formula X2O and a relative formula mass of 144. What is element X? A copper, Cu B gadolinium, Gd C sulfur, S D tellurium, Te

Question

The diagram shows the electrolysis of concentrated hydrochloric acid and concentrated aqueous sodium chloride using carbon electrodes. + – + – electrode 1 electrode 2 electrode 3 electrode 4 concentrated concentrated aqueous hydrochloric acid sodium chloride At which electrodes is hydrogen produced? A electrode 1 only B electrodes 1 and 3 C electrode 2 only D electrodes 2 and 4

Question

The diagram shows the electrolysis of aqueous copper(II) sulfate using inert electrodes. Which arrow shows the movement of electrons in the circuit? power supply A B anode cathode C D

Question

Which row identifies a chemical change and a physical change? chemical change physical change A boiling ethanol burning ethanol B burning ethanol evaporating ethanol C dissolving ethanol in water burning ethanol D evaporating ethanol dissolving ethanol in water

Question

Which statements explain why increasing the concentration of a reactant increases the rate of reaction? 1 It increases the collision rate of particles. 2 It lowers the activation energy. 3 A greater proportion of the colliding molecules have the required activation energy. 4 There are more particles per unit volume. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

Question

When the colourless gas N2O4 is heated, it forms the brown gas NO2. When the reaction mixture is cooled, the brown colour fades and turns back to colourless. Which type of reaction is described by these observations? A decomposition B displacement C reduction D reversible

Question

Water is added to anhydrous copper(II) sulfate. What happens during the reaction? A The copper(II) sulfate turns blue and the solution formed gets colder. B The copper(II) sulfate turns blue and the solution formed gets hotter. C The copper(II) sulfate turns white and the solution formed gets colder. D The copper(II) sulfate turns white and the solution formed gets hotter.

Question

Which arrow on the energy level diagram shows the overall energy change for an endothermic reaction? C products energy A D reactants B progress of reaction

Question

When a hydrogen–oxygen fuel cell is in operation, a different reaction happens at each electrode. at the hydrogen electrode H2 → 2H+ + 2e– at the oxygen electrode O2 + 2H2O + 4e– → 4OH– The electrons that are lost at the hydrogen electrode travel through the external circuit to the oxygen electrode, where they are gained by the oxygen and water. A hydrogen–oxygen fuel cell is operated for a period of time and four moles of oxygen molecules are consumed. Which mass of hydrogen is consumed? A 2.0 g B 4.0 g C 8.0 g D 16.0 g

Question

The oxides of two elements, X and Y, are separately dissolved in water and the pH of each solution tested. oxide tested pH of solution X 1 Y 13 Which information about X and Y is correct? oxide is oxide is metal non-metal acidic basic A X Y X Y B X Y Y X C Y X X Y D Y X Y X

Question

An acid is neutralised by adding an excess of an insoluble solid base. A soluble salt is formed. How is the pure salt obtained from the reaction mixture? A crystallisation → evaporation → filtration B evaporation → crystallisation → filtration C filtration → crystallisation → evaporation D filtration → evaporation → crystallisation

Question

Substance J takes part in a redox reaction. In the reaction, J gains electrons. Which statement is correct? A J is the oxidising agent and it is oxidised in the reaction. B J is the oxidising agent and it is reduced in the reaction. C J is the reducing agent and it is oxidised in the reaction. D J is the reducing agent and it is reduced in the reaction.

Question

Elements in Group IV of the Periodic Table are shown. carbon silicon germanium tin lead What does not occur in Group IV as it is descended? A The proton number of the elements increases. B The elements become more metallic. C The elements have more electrons in their outer shell. D The elements have more electron shells.

Question

Which statement about acids is correct? A Acids are proton acceptors. B Acids transfer electrons to bases in aqueous solution. C Hydrochloric acid reacts with ammonium hydroxide to produce ammonia. D Ethanoic acid partially ionises in aqueous solution.

Question

Which elements have both a high melting point and variable oxidation states? A alkali metals B transition elements C halogens D noble gases

Question

Lithium, sodium and potassium are elements in Group I of the Periodic Table. Chlorine, bromine and iodine are elements in Group VII of the Periodic Table. Which row identifies the least dense of these elements in each group? Group I Group VII A lithium chlorine B lithium iodine C potassium chlorine D potassium iodine

Question

The reactions of metals P, Q, R and S are shown. reaction reaction with reduction of the metal with water hydrochloric acid metal oxide with carbon P no reaction no reaction reduced Q slow vigorous no reaction R vigorous vigorous no reaction S very slow vigorous reduced What is the order of reactivity of the metals? least most reactive reactive A P S Q R B P Q S R C R S Q P D R Q S P

Question

The number of protons and the number of neutrons in the atoms of elements X, Y and Z are shown. number of number of protons neutrons X 6 6 Y 7 6 Z 8 10 Which statement about the elements is correct? A X and Y are isotopes of the same element. B Z forms an ion with a +2 charge. C X and Z react together to form an ionic compound. D X, Y and Z are non-metals.

Question

Which diagram represents the arrangement of atoms in an alloy? A B C D

Question

Three metal compounds, J, K and L, are heated using a Bunsen burner. The results are shown. J colourless gas produced, which relights a glowing splint K colourless gas produced, which turns limewater milky L no reaction Which row identifies J, K and L? J K L A magnesium carbonate potassium carbonate potassium nitrate B magnesium carbonate potassium nitrate potassium carbonate C potassium nitrate magnesium carbonate potassium carbonate D potassium nitrate potassium carbonate magnesium carbonate

Question

Processes involved in the extraction of zinc are listed. 1 Heat zinc oxide with carbon. 2 Condense zinc vapour. 3 Vaporise the zinc. 4 Roast zinc ore in air. In which order are the processes carried out? A 1→2→3→4 B 4→3→1→2 C 4→1→3→2 D 1→4→3→2

Question

Which process uses sacrificial protection to prevent steel from rusting? A galvanising B oiling C copper plating D painting

Question

Fertilisers are used to provide three of the elements needed for plant growth. Which two compounds would give a fertiliser containing all three of these elements? A Ca(NO3)2 and (NH4)2SO4 B Ca(NO3)2 and (NH4)3PO4 C KNO3 and (NH4)2SO4 D KNO3 and (NH4)3PO4

Question

Which processes produce carbon dioxide? 1 respiration 2 photosynthesis 3 fermentation 4 combustion of hydrogen A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

Question

Which reaction in the Contact process requires the use of a catalyst? A S + O2 → SO2 B 2SO2 + O2 → 2SO3 C SO3 + H2SO4 → H2S2O7 D H2S2O7 + H2O → 2H2SO4

Question

What are the products when limestone (calcium carbonate) is heated strongly? A calcium hydroxide and carbon dioxide B calcium hydroxide and carbon monoxide C calcium oxide and carbon dioxide D calcium oxide and carbon monoxide

Question

The structure of ester W is shown. H O H C C H H O C H H Which row gives the names of ester W and the carboxylic acid and alcohol from which it is made? name of ester W carboxylic acid alcohol A ethyl methanoate ethanoic acid methanol B ethyl methanoate methanoic acid ethanol C methyl ethanoate ethanoic acid methanol D methyl ethanoate methanoic acid ethanol

Question

Ethene reacts with substance X to form ethanol. What is X? A ethanoic acid B glucose C hydrogen D steam

Question

Alkenes can be produced by cracking large hydrocarbon molecules to form smaller hydrocarbon molecules. Which equations represent possible reactions when tetradecane, C14H30, is cracked? 1 C14H30 → C2H6 + C3H6 + C4H8 + C5H10 2 C14H30 → H2 + C2H4 + C3H6 + C4H8 + C5H10 3 C14H30 → C2H6 + 4C3H6 4 C14H30 → C2H6 + C3H8 + C9H18 A 1 only B 1 and 4 C 1, 2 and 3 D 3 and 4

Question

The structures of some hydrocarbons are shown. 1 2 3 4 H H H H H H H H H H H C C H H C H H C C C H H C C C C H H H H H H H H H H H H H C C H H C C C H H H H H H Which statement about the hydrocarbons is correct? A 1 and 2 have a different general formula. B 1 and 4 are in different homologous series. C 2 and 3 are structural isomers. D 3 and 4 have the same empirical formula.

Question

Ethane reacts with chlorine in the presence of ultraviolet light. Which substances are produced in the reaction? 1 2 3 4 H H H H H H H C C Cl H C C H H Cl H H Cl Cl A 1, 2 and 3 B 1 and 3 only C 2, 3 and 4 D 2 and 4 only

Question

Which polymer structure has the same linkages as Terylene? A B CH3 CH3 CH3 CH3 O C C O C C C C H n H H n O OH C D H CH3 CH3 O CH3 CH3 N C C C C C O H H n H H n 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.).