Chemistry 0620/22 May/June 2024: question paper and mark scheme

Question

Which gas has the slowest rate of diffusion? A H2 B NH3 C CH4 D CO2

Question

Which statements about the position of the elements in the Periodic Table are correct? 1 Elements in the same group have similar chemical properties. 2 Elements in the same period have similar chemical properties. 3 Elements in the same group have the same number of electron shells. 4 Elements in the same group have the same number of outer shell electrons. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

Question

Which statements about isotopes are correct? 1 Isotopes are atoms of different elements with the same number of protons. 2 Isotopes of the same element have the same chemical properties. 3 Isotopes are atoms with the same relative atomic mass. 4 Isotopes of the same element have the same electronic configuration. A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

Question

Which diagram shows the arrangement of the outer shell electrons in a molecule of water? A B H H H H O O C D H H H H O O

Question

The structures of three substances are shown. 1 2 3 Which substances are hard and have a high melting point? A 1, 2 and 3 B 1 only C 2 only D 2 and 3 only

Question

Information about four substances, W, X, Y and Z, is shown. melting point / °C electrical conductivity W 1710 does not conduct when solid X 3500 conducts when solid Y 120 does not conduct Z 801 conducts when molten W, X, Y and Z are graphite, poly(ethene), sodium chloride and silicon(IV) oxide but not in that order. What are W, X, Y and Z? W X Y Z A graphite poly(ethene) silicon(IV) oxide sodium chloride B sodium chloride graphite poly(ethene) silicon(IV) oxide C poly(ethene) sodium chloride graphite silicon(IV) oxide D silicon(IV) oxide graphite poly(ethene) sodium chloride

Question

The structure of glycine is shown. H H O N C C H H O H Which row is correct? number of different formula of glycine elements in glycine A CH5O2N 10 B C2H5O2N 4 C C2H5O2N 10 D H2NCHCOOH 4

Question

The incomplete equation for photosynthesis is shown. wCO2 + xH2O → P + yO2 Compound P is a product of the reaction. Which row describes the values of w, x and y and gives the empirical formula of compound P? empirical formula values of w, x and y of compound P A w, x and y are all the same CH2O B w, x and y are all the same C6H12O6 C w and x are the same and both are greater than y CH2O D w and x are the same and both are greater than y C6H12O6

Question

The concentration and volume of an aqueous alkali are known. Which additional information is required to calculate the number of moles of acid needed to neutralise the aqueous alkali? A the concentration of the acid B the equation for the acid–alkali reaction C the formula of the acid D the volume of the acid required for neutralisation

Question

Which statement about electrolysis is correct? A Electrons move through the electrolyte from the cathode to the anode. B Electrons move in the external circuit towards the cathode. C Negative ions move in the external circuit towards the anode. D Positive ions move through the electrolyte towards the anode.

Question

Aqueous copper(II) sulfate is electrolysed using copper electrodes. What is the half-equation for the reaction at the cathode? + – A 2H + 2e → H2 – – B 4OH → O2 + 2H2O + 4e 2+ – C Cu → Cu + 2e 2+ – D Cu + 2e → Cu

Question

Three statements about activation energy, Ea, are listed. 1 Colliding particles must have at least Ea before they can react. 2 Ea for exothermic reactions is always greater than for endothermic reactions. 3 Ea is always endothermic. Which statements are correct? A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only 3 3

Question

A student adds excess magnesium ribbon to 10 cm of 0.5 mol / dm sulfuric acid. The hydrogen gas produced is collected and its total volume is measured every 10 seconds. 3 3 3 The experiment is repeated with 5 cm of 0.5 mol / dm sulfuric acid added to 5 cm of water using the same mass of magnesium ribbon. Which line on the graph shows the results of the second experiment? 250 A 200 150 original experiment total volume of B hydrogen / cm3 100 C 50 D 0 0 50 100 150 200 250 time / s

Question

The equation represents the reversible reaction between ethene and steam. C2H4(g) + H2O(g) ⇌ C2H5OH(g) ∆H is negative Which row describes the conditions that produce the greatest yield of ethanol? pressure temperature A low low B low high C high low D high high

Question

Which row identifies the pressure and the catalyst used for the conversion of sulfur dioxide to sulfur trioxide in the Contact process? pressure / atm catalyst A 2 iron B 2 vanadium(V) oxide C 200 iron D 200 vanadium(V) oxide

Question

Which equation represents a redox reaction? A AgNO3 + NaCl → AgCl + NaNO3 B PCl 5 + 4H2O → H3PO4 + 5HCl C 3Fe + 4H2O → Fe3O4 + 4H2 D MgCO3 + 2HCl → MgCl 2 + CO2 + H2O

Question

The equation for the reaction between aluminium and copper(II) oxide is shown. 2Al + 3CuO → Al 2O3 + 3Cu Which statements about this equation are correct? 1 The oxidation number of the aluminium reactant is +2. 2 The oxidation number of the aluminium in the product is +6. 3 The oxidation number of the copper in the reactant is +2. 4 The oxidation number of the copper product is 0. A 1, 2 and 3 B 1 and 2 only C 3 and 4 D 4 only

Question

What is the colour of thymolphthalein in dilute hydrochloric acid? A blue B red C yellow D colourless

Question

Two acids, P and Q, with the same concentration and volume are reacted separately with the same mass of magnesium ribbon. The reactions produce the same total volume of hydrogen gas but acid Q reacts much more slowly than acid P. Which explanation for the difference between P and Q is correct? A Acid P has a higher pH than acid Q. B Acid P has a lower concentration of hydrogen ions. C Acid Q is partially dissociated and acid P is fully dissociated. D Acid Q is a proton acceptor.

Question

Which process is not used in the preparation of an insoluble salt? A filtration B washing C crystallisation D drying

Question

Lithium and potassium are metals in Group I of the Periodic Table. 3 Lithium has a melting point of 181 °C and a density of 0.53 g / cm . Which row describes the melting point and density of potassium? 3 melting point in °C density in g / cm A less than 181 less than 0.53 B less than 181 greater than 0.53 C greater than 181 less than 0.53 D greater than 181 greater than 0.53

Question

Which statements about transition elements are correct? 1 They have a low density. 2 They form ions with variable oxidation numbers. 3 They have a high melting point. 4 They form only colourless compounds. A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

Question

Which statements describe the elements in Group VIII of the Periodic Table? 1 Their atoms have full outer electron shells. 2 They are unreactive metals. 3 They are monatomic gases. 4 They are diatomic gases. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

Question

Four metals, Q, R, S and T, are each added to separate samples of water, steam and dilute hydrochloric acid. The results are shown. observation with observation with observation with dilute water steam hydrochloric acid Q slow reaction fast reaction fast reaction R no reaction no reaction no reaction S no reaction very slow reaction slow reaction T fast reaction explodes explodes Which statements are correct? 1 R is the least reactive metal. 2 T could be potassium. 3 S is more reactive than Q and R. 4 Metals generally react faster with steam than they react with water. A 1, 2 and 4 B 1 and 2 only C 2 and 3 D 3 and 4

Question

Metal X acts as a sacrificial metal to prevent iron from corroding. Metal X does not act as a sacrificial metal to prevent aluminium from corroding. What is X? A copper B magnesium C silver D zinc

Question

Which equation represents the reduction of a compound found in hematite in the blast furnace? A 2Al 2O3 → 4Al + 3O2 B CaO + SiO2 → CaSiO3 C 2FeO + CO → Fe2O3 + C D Fe2O3 + 3CO → 2Fe + 3CO2

Question

Which statements about the treatment of domestic water supplies are correct? 1 Filtration is used to remove insoluble substances from the water. 2 Sedimentation is used to remove soluble substances from the water. 3 Carbon is used to remove tastes and odours from the water. 4 Chlorine is used to lower the pH of the water. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

Question

Which statement about water is correct? A It turns anhydrous copper(II) sulfate from pink to blue. B It turns anhydrous copper(II) sulfate from white to blue. C It turns cobalt(II) chloride paper from blue to white. D It turns cobalt(II) chloride paper from pink to blue.

Question

Cupronickel is used to make coins. The arrangement of atoms in cupronickel is shown. copper atoms nickel atoms Which kind of substance is cupronickel? A an alloy B an isotope C a compound D a transition element

Question

Which physical properties are typical of all metals? 1 good heat conductivity 2 low density 3 malleability A 1 and 2 B 1 and 3 C 2 and 3 D 3 only

Question

Which oxide is used to neutralise acidic gases in flue gas desulfurisation? A calcium oxide B carbon dioxide C nitrogen oxide D sulfur dioxide

Question

Some information about three gases, P, Q and R, is listed. • Gas P forms when magnesium reacts with dilute hydrochloric acid. • Gas Q makes up 78% of the air. • Gas R forms when gas P reacts with gas Q. What is gas R? A ammonia B methane C nitrogen dioxide D water vapour

Question

Which formula represents an alkene? A CH4 B C2H4 C C2H6 D C2H5OH

Question

The structures of two compounds used to make an ester are shown. H H O H H H C C C H C C OH H H OH H H What is the name of the ester? A ethyl propanoate B propyl ethanoate C ethyl ethanoate D propyl propanoate

Question

Which statement about a homologous series is correct? A All members have the same general formula. B All members have the same molecular formula. C All members have similar physical properties. D Members show a trend in their chemical properties.

Question

Which statements about aqueous ethanoic acid are correct? 1 It contains the functional group –COOH. 2 It reacts with carbonates to produce hydrogen. 3 It turns universal indicator paper blue. 4 It has a pH lower than pH 7. A 1 and 2 B 1 and 3 C 1 and 4 D 2 and 4

Question

Alkenes react with steam in an addition reaction. Some alkenes produce only one alcohol product. Some alkenes produce two different alcohols which are structural isomers. Which row gives the number of alcohol isomers formed when ethene reacts with steam and when propene reacts with steam? number of alcohol isomers formed ethene + steam propene + steam A 1 1 B 1 2 C 2 1 D 2 2

Question

What is an advantage of manufacturing ethanol by fermentation rather than by the addition of steam to ethene? A No gases that cause global warming are produced. B The ethanol that is produced is pure. C Fermentation is a fast process. D Fermentation uses renewable raw materials.

Question

The diagram shows the structure of a polymer. H O CH3 H H C CH3 H C C C C C C H C CH3 H H C O H O H Which structure represents the monomer for this polymer? A B H3 C H H H C C C C C C H H3 C C H H H H O O C D H O H H H3C H C H C C C C H C C C C H H H O H C CH3 H O H 3

Question

Which piece of apparatus is used to measure 24.5 cm of gas produced during a reaction? A beaker B conical flask C measuring cylinder D volumetric pipette 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_22_2024_1.11 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.).