Chemistry 0620/23 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

Which statement describes the properties of both diamond and silicon(IV) oxide? A They are brittle, with a low melting point, and are insoluble in water. B They are hard, with a high melting point, and are electrical insulators. C They are malleable, with a high melting point, and are electrical conductors. D They are soft, with a low melting point, and are electrical insulators.

Question

Paper chromatography is used to separate four different coloured inks, W, X, Y and Z, and an unknown ink T. The chromatogram is shown. solvent front baseline W X Y Z T Which inks are present in ink T? A W and X B W and Y C X and Z D Y and Z

Question

Particle P has an atomic number of 18, a mass number of 40 and no overall charge. Particle Q has an atomic number of 19, a mass number of 40 and a single positive charge. Which statement is correct? A They are isotopes of the same element. B They are both ions. C Q has more neutrons than P. D They have the same number of electrons in their outer shell.

Question

Which statement about the properties of metals is correct? A Metals are malleable because the layers of positive ions can slide over each other. B Metals conduct electricity when solid because the positive ions move freely through the metal. C Metals conduct electricity because there is a strong force of attraction between the positive ions and the delocalised electrons. D Metals have a high melting point because the positive ions attract each other strongly.

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

A 0.5 g sample of calcium carbonate is reacted with excess dilute hydrochloric acid. CaCO3(s) + 2HCl (aq) → CaCl 2(aq) + H2O(l) + CO2(g) Which volume of CO2 is produced at r.t.p.? A 0.12 dm3 B 0.18 dm3 C 0.24 dm3 D 12 dm3

Question

Aluminium is manufactured from aluminium oxide by electrolysis. Which row shows the ionic half-equations at each electrode and describes the role of cryolite in the process? reaction at anode reaction at cathode role of cryolite A 2O2– → O2 + 4e– Al 3+ + 3e– → 3Al catalyst B Al 3+ + 3e– → Al 2O2– → O2 + 4e– solvent for aluminium oxide C 2O2– → O2 + 4e– Al 3+ + 3e– → Al solvent for aluminium oxide D Al 3+ + 3e– → 3Al 2O2– → O2 + 4e– catalyst

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

Which statement about fuels is correct? A Coal and ethanol are examples of non-renewable energy sources. B Hydrogen and oxygen can be reacted to produce an electric current. C Large amounts of energy are taken in by a fuel when it burns. D Radioactive isotopes are burned to produce heat.

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

Metal M reacts with steam and produces gas G. Which row identifies gas G and the type of reaction when metal M reacts with steam? gas G type of reaction A hydrogen redox B hydrogen neutralisation C oxygen redox D oxygen neutralisation

Question

Which statement explains why increasing the concentration of a reactant increases the rate of the reaction? A A greater proportion of the particles have the activation energy so there are more successful collisions. B Particles have more energy so there are more frequent collisions. C There are more particles in the same volume so there are more frequent collisions. D The particles move more quickly so there are more frequent collisions.

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 statement explains why lime is added to soil? A to decrease the pH of acidic soil B to decrease the pH of alkaline soil C to increase the pH of acidic soil D to increase the pH of alkaline soil

Question

Sulfur dioxide is bubbled through water containing litmus. sulfur dioxide water and litmus Which row describes and explains what happens to the litmus? observation explanation A it turns blue sulfur dioxide is a basic oxide B it turns blue sulfur dioxide is an acidic oxide C it turns red sulfur dioxide is an acidic oxide D it turns red sulfur dioxide is a basic oxide

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

Which ion forms a precipitate that dissolves in excess with both aqueous ammonia and with aqueous sodium hydroxide? A calcium ion, Ca2+ B copper(II) ion, Cu2+ C iron(III) ion, Fe3+ D zinc ion, Zn2+

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

W, X, Y and Z are elements in Period 3 of the Periodic Table. The numbers of outer-shell electrons in an atom of each element are shown. number of element outer-shell electrons W 1 X 2 Y 7 Z 8 Which elements are non-metals? A W, X and Y B W and X only C Y and Z D Z only

Question

Selenium is an element in Group VI. Group VI elements follow similar trends to Group VII elements. Which statement about selenium is correct? A It has a higher density than sulfur. B It has a lower melting point than sulfur. C It has six electron shells. D It is a monoatomic element.

Question

Which row describes the properties of a typical transition element? melting used as density point catalyst A high high yes B high low no C low high yes D low low no

Question

Which row describes an atom of a noble gas? number of number of number of protons neutrons electrons A 2 2 0 B 2 2 2 C 8 8 8 D 8 8 10

Question

Some properties of four elements, P, Q, R and S, are shown. Solid P reacts with dilute hydrochloric acid to give hydrogen. Solid Q does not conduct electricity. Solid R is used to make saucepans because it is a good conductor of heat. Solid S reacts with oxygen to form a compound where atoms of S share electrons with atoms of oxygen. Which elements are metals? A P and R B P and S C Q and R D Q and S

Question

Which substance is used to reduce zinc oxide in the manufacture of zinc? A carbon B carbon dioxide C hydrogen D sulfur dioxide

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

Nitrogen oxide, NO, is formed in the engine of petrol-powered cars. One constituent of petrol is octane, C8H18. Nitrogen oxide is removed from exhaust fumes by catalytic converters. Which row identifies the reactants that produce nitrogen oxide and a reaction that removes it in a catalytic converter? reactants that produce NO reaction that removes NO A octane + one gas found in air 2NO + 2CO → N2 + 2CO2 B octane + one gas found in air NO + CO2 → NO2 + CO C two gases found in air 2NO + 2CO → N2 + 2CO2 D two gases found in air NO + CO2 → NO2 + CO

Question

A magnesium block is attached to iron to prevent it from rusting. Which statement about this method of rust prevention is correct? A Magnesium corrodes instead of iron because it is more reactive. B Magnesium prevents oxygen from reaching the iron. C The iron does not rust because it has a greater tendency to form ions than magnesium. D This method of rust prevention is called galvanising.

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 increase the amount of carbon dioxide in the air? 1 combustion of hydrogen 2 combustion of methane 3 photosynthesis by plants 4 thermal decomposition of limestone A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

Question

In the Contact process, sulfur dioxide is converted into sulfur trioxide. 2SO2(g) + O2(g) 2SO3(g) What is the effect of lowering the pressure on the rate of formation and percentage yield of sulfur trioxide at equilibrium? rate of percentage formation yield A decreases decreases B decreases increases C increases decreases D increases increases

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

The equation for the reaction between butane, C4H10, and chlorine is shown. C4H10 + Cl 2 → C4H9Cl + HCl Which type of reaction does butane undergo when it reacts with chlorine? A addition B reduction C acid–base D substitution

Question

Butene has three structural isomers which are alkenes. Which statements about these isomers are correct? 1 They have the same molecular formula. 2 They have different numbers of bonds in the molecule. 3 They have a C=C bond in the structure. A 1 and 2 B 1 and 3 C 2 only D 3 only

Question

The hydrocarbon C12H26 is cracked to give X and Y, as shown. C12H26 → X + Y Which statement is correct? A If X is C6H12 then Y will react with aqueous bromine. B If X is C10H22 then Y can be used to make a polymer. C If X is a hydrogen molecule then Y is an alkane. D X and Y could be structural isomers.

Question

An ester, C4H8O2, is made by reacting 0.06 mol of ethanol, C2H6O, and 0.05 mol of ethanoic acid, C2H4O2. C2H6O + C2H4O2 → C4H8O2 + H2O 0.0375 mol of the ester was made. What is the percentage yield and the Mr of the ester? percentage Mr yield / % A 62.5 48 B 75.0 48 C 62.5 88 D 75.0 88

Question

Which type of compound is made when a protein is hydrolysed? A alkene B amino acid C carboxylic acid D sugar 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.).