Chemistry 0620/12 October/November 2023: question paper and mark scheme

Question

The melting points and boiling points of four elements are shown. melting boiling element point / °C point / °C W –7 60 X –101 –34 Y 114 184 Z 39 688 In which elements do the particles vibrate about fixed positions at 0 °C? A W and X B W and Z C X and Y D Y and Z

Question

Which statements about clean, dry air are correct? 1 It is a mixture of elements only. 2 It is a mixture of elements and compounds. 3 It contains only non-metals. A 1 and 3 B 1 only C 2 and 3 D 2 only

Question

A representation of an atom is shown. – + + – – + + + – – + – What is the nucleon number of this atom? A 6 B 7 C 12 D 13

Question

Which statement describes isotopes of the same element? A They have different electron arrangements. B They have different nuclear charges. C They have nuclei with masses that are the same. D They have the same number of protons.

Question

Potassium reacts with iodine to form potassium iodide. Which statement about potassium iodide is correct? A Each potassium atom shares a pair of electrons with an iodine atom. B In potassium iodide, the particles of potassium have more protons than electrons. C Potassium iodide has a high melting point because it is a covalent compound. D Potassium iodide has a low melting point because it is an ionic compound.

Question

Which row describes the properties of a simple molecular substance? electrical boiling point conductivity when solid A low poor B high poor C low good D high good

Question

Different forms of an element G are used as lubricants and in cutting tools. What is the structure of G? A giant covalent B ionic C metallic D simple covalent

Question

The diagram shows the structure of a molecule of ethyl ethanoate. H O H C C H H H O C C H H H What is the molecular formula of a molecule of ethyl ethanoate? A CHO B C4H8O2 C C4(H2)2(O2) D C2H4O

Question

The formula of a compound containing element X is Na2X2O3. The relative formula mass of the compound is 158. What is the relative atomic mass of X? A 32 B 59.5 C 64 D 119

Question

Limestone is used to reduce sulfur dioxide emissions from coal-fired power stations. The equation for the reaction is shown. CaCO3 + SO2 → CaSO3 + CO2 What is the smallest mass of CaCO3 required to remove 1 tonne of SO2? A 1 tonne B 2 tonnes C 64 tonnes D 100 tonnes

Question

Which statement about electrolysis is correct? A Bromine and hydrogen are formed during the electrolysis of molten lead(II) bromide. B Metals are formed at the positive electrode. C Molten covalent compounds are broken down by electricity. D Platinum is used as an inert electrode.

Question

Which statements about hydrogen-oxygen fuel cells are correct? 1 The reaction between hydrogen and oxygen is endothermic. 2 The waste product in a hydrogen-oxygen fuel cell is water. 3 A chemical reaction in the cell produces hydrogen which is used as the fuel. 4 A hydrogen-oxygen fuel cell is used to generate electricity. A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

Question

The initial and final temperatures of four different reactions are measured. Which reaction is the least exothermic? initial final temperature temperature / °C / °C A 19 25 B 21 18 C 22 17 D 22 26

Question

Solid calcium carbonate reacts with dilute hydrochloric acid. Which changes to the reaction conditions increase the rate of reaction? concentration of surface area of hydrochloric acid calcium carbonate A decrease decrease B decrease increase C increase decrease D increase increase

Question

Zinc reacts slowly with dilute sulfuric acid at room temperature. Bubbles of a gas, L, form on the surface of the zinc. When a small amount of copper is added, the reaction is faster. Which row identifies L and explains why the reaction is faster? gas formed reason the reaction is faster in reaction A hydrogen copper acts as a catalyst B hydrogen copper is more reactive than zinc C oxygen copper acts as a catalyst D oxygen copper is more reactive than zinc

Question

Which reaction shows a colour change from white to blue? A adding water to anhydrous copper(II) sulfate B adding water to hydrated copper(II) sulfate C heating anhydrous copper(II) sulfate D heating hydrated copper(II) sulfate

Question

In a blast furnace, iron(III) oxide is converted to iron and carbon monoxide is converted to carbon dioxide. Fe2O3 + 3CO → 2Fe + 3CO2 What happens to each of these reactants? A Both iron(III) oxide and carbon monoxide are oxidised. B Both iron(III) oxide and carbon monoxide are reduced. C Iron(III) oxide is oxidised and carbon monoxide is reduced. D Iron(III) oxide is reduced and carbon monoxide is oxidised.

Question

Which products are formed when magnesium carbonate reacts with dilute hydrochloric acid? A carbon dioxide, hydrogen and magnesium chloride B carbon dioxide and magnesium chloride only C carbon dioxide, water and magnesium chloride D water and magnesium chloride only

Question

Which element forms an oxide that reacts with an aqueous solution of a base? A argon B sulfur C magnesium D copper

Question

Which salt is insoluble? A barium sulfate B lead(II) nitrate C magnesium chloride D sodium carbonate

Question

Some properties of element R are shown. melting point in °C 98 boiling point in °C 883 reaction with cold water gives off H2 gas reaction when heated with oxygen burns to give a white solid In which part of the Periodic Table is R found? A Group I B Group VII C Group VIII D transition elements

Question

Lithium, sodium and potassium are elements in Group I. Statements about these elements are listed. 1 Lithium is more dense than sodium. 2 Sodium is more reactive than potassium. 3 They all conduct electricity at room temperature. 4 They all react with oxygen at room temperature. Which statements are correct? A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

Question

An outline of the Periodic Table is shown. Y Which name is given to the elements in column Y? A alkali metals B halogens C noble gases D transition elements

Question

Which row describes the properties of a metal that can be used in the manufacture of aircraft? strength density ease of corrosion A high high corrodes easily B high low resists corrosion C low high corrodes easily D low low resists corrosion

Question

Which metallic element is added to iron in the manufacture of stainless steel? A carbon B copper C lead D nickel

Question

Which statement about the uses of metals is correct? A Aluminium is used in the manufacture of overhead electrical cables as it has a high density. B Aluminium is used to make food containers as it conducts electricity. C Stainless steel is used in cutlery because it is resistant to rusting. D Stainless steel is used to make chemical reactors because it is a soft alloy.

Question

The list gives the order of some metals and hydrogen in the reactivity series. Metal X is also included. most reactive K Mg Zn H X least reactive Cu Which row shows the properties of metal X? reacts with oxide reduced dilute acids by carbon A no no B no yes C yes no D yes yes

Question

Which gas in the air is needed for iron to rust? A argon B carbon dioxide C nitrogen D oxygen

Question

Why is limestone added to the blast furnace? A It neutralises the molten slag produced. B It reacts with impurities to form slag. C It releases carbon dioxide which reduces the iron(III) oxide. D It removes acidic gases such as carbon dioxide.

Question

Which process removes carbon dioxide from the atmosphere? A photosynthesis B thermal decomposition of calcium carbonate C combustion of fossil fuels D reaction of sodium carbonate with an acid

Question

The flow chart shows stages in the treatment of river water to produce drinking water. river sedimentation stage stage drinking water tank J K water What occurs at stages J and K? J K A distillation chlorination B distillation filtration C filtration chlorination D filtration distillation

Question

Which two compounds can be mixed together to form an NPK fertiliser? A ammonium phosphate and calcium hydroxide B calcium phosphate and ammonium nitrate C potassium nitrate and calcium oxide D potassium phosphate and ammonium nitrate

Question

What are the main substances produced by the fractional distillation of liquid air? A oxygen and carbon dioxide B oxygen and nitrogen C helium and nitrogen D hydrogen and oxygen

Question

Which diagram shows the displayed formula for the named organic compound? A B C D H O H H H O H H H H C C O O H H C C H H C C H H C C H H H H H H H H ethanoic acid ethene ethanol methane

Question

Poly(ethene) is formed from petroleum using three separate processes. In which order are the processes used? A cracking → fractional distillation → polymerisation B cracking → polymerisation → fractional distillation C fractional distillation → cracking → polymerisation D fractional distillation → polymerisation → cracking

Question

Gas oil and naphtha are two fractions obtained from petroleum. What are uses of gas oil and naphtha? gas oil naphtha A jet fuel making chemicals B jet fuel making roads C diesel engine fuel making chemicals D diesel engine fuel making roads

Question

Ethene can be polymerised. Which diagram represents the structure of the product formed? A B C D H H H H H H H H H H C C C C C C H C C C C H H H H H n H H n H H H H

Question

An acid–base titration is described. ● 25.0 cm3 of dilute aqueous alkali is put into a conical flask. ● Indicator is added to the flask. ● Dilute acid is added to the aqueous alkali until the indicator changes colour. ● The volume of acid used is then recorded. Which use of apparatus is correct? A The 25.0 cm3 of aqueous alkali is measured using a volumetric pipette. B The 25.0 cm3 of aqueous alkali is measured using the lines on the conical flask. C The volume of acid is measured using a measuring cylinder. D The volume of acid is measured using a volumetric pipette.

Question

The apparatus shown is used to separate a mixture. heat What is the mixture? A anhydrous copper(II) sulfate and hydrated copper(II) sulfate B sodium chloride and sand C ethanol and methanol D iron and steel

Question

The results of tests on three gases, X, Y and Z, are shown. test X Y Z aqueous potassium manganate(VII) purple to colourless no change no change damp red litmus paper no change turns blue no change lighted splint no change no change pops What are X, Y and Z? X Y Z A chlorine sulfur dioxide hydrogen B chlorine sulfur dioxide oxygen C sulfur dioxide ammonia oxygen D sulfur dioxide ammonia hydrogen 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.).