Chemistry 0620/11 May/June 2024: question paper and mark scheme

Question

The boiling point of sodium is 890 °C. What happens to sodium atoms as the temperature of a sample of sodium changes from 950 °C to 900 °C? A The atoms move more quickly and bonds are formed. B The atoms move more quickly and bonds are neither broken nor formed. C The atoms move more slowly and bonds are formed. D The atoms move more slowly and bonds are neither broken nor formed.

Question

Which row shows the conditions for the particles of a gas colliding most frequently? pressure temperature A high high B high low C low high D low low

Question

The diagram shows some properties of particles in an atom. To which labelled part of the diagram do electrons belong? found outside nucleus A C B relative mass relative less than 1 D charge of 1–

Question

Some properties of substances W, X, Y and Z are shown. melting point / °C electrical conductivity W 801 conducts when molten X –182 does not conduct Y 840 conducts when solid Z 501 conducts when molten Which substances are ionic? A W, X and Y B W and Y only C W and Z D X and Z

Question

Atoms lose or gain electrons to become ions. Which row is correct? change to the atom type of ion charge on ion A loss of two electrons cation 2– B loss of one electron anion 1– C gain of three electrons anion 3– D gain of one electron cation 1–

Question

A covalent molecule, M, contains four shared pairs of electrons. What is M? A ammonia, NH3 B hydrogen chloride, HCl C methane, CH4 D water, H2O

Question

Which substance has a giant covalent structure? A sodium chloride B sodium C ethane D diamond

Question

Iron(III) oxide is reduced by carbon monoxide to produce iron and carbon dioxide. What is the balanced equation for this reaction? A Fe2O3 + 2CO → 2Fe + 2CO2 B Fe2O3 + 3CO → 2Fe + 3CO2 C 2Fe2O3 + 6CO → 2Fe + 6CO2 D 2Fe2O3 + 3CO → 4Fe + 3CO2

Question

The equation for the reaction between magnesium and dilute hydrochloric acid is shown. Mg + 2HCl → MgCl 2 + H2 Which mass of magnesium chloride is formed when 48.0 g of magnesium completely reacts with excess dilute hydrochloric acid? A 23.8 g B 47.5 g C 95.0 g D 190 g

Question

Dilute sulfuric acid and lead(II) bromide are electrolysed separately. Which statements are correct? 1 Colourless gases are produced when dilute sulfuric acid is electrolysed. 2 Lead(II) bromide can be electrolysed when molten. 3 Lead is formed at the positive electrode when lead(II) bromide is electrolysed. 4 Sulfate ions are produced at the negative electrode when dilute sulfuric acid is electrolysed. A 1 and 2 B 1 and 3 C 2 and 3 D 3 and 4

Question

Which statements about a hydrogen–oxygen fuel cell are correct? 1 The main form of energy released by the fuel cell is heat. 2 The reaction is a redox reaction. 3 An acidic gas is produced. 4 Water is the only chemical product. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

Question

Which row describes what happens during an endothermic reaction? thermal energy is change in temperature of transferred the reaction mixture A from the surroundings decrease B from the surroundings increase C to the surroundings decrease D to the surroundings increase

Question

Which diagram represents a chemical change? A B C D

Question

A method used to investigate the rate of reaction of calcium carbonate with dilute hydrochloric acid under different conditions is shown. 3 • Place 50 cm of dilute hydrochloric acid in a conical flask. • Add a known volume of water to the conical flask. • Heat the conical flask to the required temperature. • Add 1.0 g of calcium carbonate to the conical flask. • Measure the time taken for the reaction to finish. Which volume of water and which temperature give the shortest time taken for the reaction to finish? volume of water 3 temperature / °C added / cm A 10 30 B 10 50 C 40 30 D 40 50

Question

The rate of reaction between magnesium and hydrochloric acid is investigated. The total volume of hydrogen given off is measured at different times. A graph of the results is shown. 25 20 total 15 volume of hydrogen / cm3 10 5 0 0 10 20 30 40 50 60 70 80 90 100 time / s Which conclusions are correct? 1 The rate is fastest between 0 and 30 seconds. 3 2 The maximum volume of hydrogen given off is 22 cm . 3 3 At 40 seconds, 20 cm of hydrogen is given off. A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

Question

Water is added to anhydrous copper(II) sulfate. Which row describes the direction of energy change and the colour change of the mixture during the reaction? direction of energy change colour change A absorbed from the surroundings blue to white B absorbed from the surroundings white to blue C released to the surroundings blue to white D released to the surroundings white to blue

Question

Which equation represents an oxidation reaction? A CaCO3 → CaO + CO2 B 4FeO + O2 → 2Fe2O3 C 2NO2 → N2O4 D 2P2O5 → P4O10

Question

A farmer treats a field with calcium hydroxide to make it less acidic. When the farmer adds ammonium nitrate fertiliser to the field immediately after the calcium hydroxide, the two substances react. Why does this reaction make the fertiliser less effective? A It makes ammonia gas, so less nitrogen is absorbed by the soil. B It makes an acid, making the soil acidic again. C It makes nitrogen gas, so less nitrogen is absorbed by the soil. D It makes the fertiliser too strong, stopping the plants growing well.

Question

Which statement about sodium oxide or nitrogen dioxide is correct? A Nitrogen dioxide is a solid at room temperature. B Nitrogen dioxide is acidic. C Sodium oxide has a lower melting point than nitrogen dioxide. D Sodium oxide is covalently bonded.

Question

A titration method is used to prepare a pure soluble sulfate salt from dilute sulfuric acid. What is the other reagent? A copper(II) oxide B magnesium C sodium hydroxide D zinc carbonate

Question

Which row about elements in the Periodic Table is correct? statement 1 statement 2 A two elements in the same group metals are on the left of the table have similar chemical properties B two elements in the same group metals are on the right of the table have similar chemical properties C two elements in the same period metals are on the left of the table have similar chemical properties D two elements in the same period metals are on the right of the table have similar chemical properties

Question

The table gives some information about three elements in Group I of the Periodic Table. melting point density element atomic number in °C 3 in g / cm lithium 3 181 0.53 sodium 11 98 0.97 rubidium 37 X X Which row identifies the melting point and the density of rubidium? melting point density 3 in °C in g / cm A 39 0.38 B 39 1.53 C 253 0.38 D 253 1.53

Question

Which statement describes a transition element? A It is a dull grey metal that only forms white compounds. B It is a high-density metal with a high melting point that is used as a catalyst. C It is a low-density metal with a high melting point that reacts with steam to make hydrogen. D It is a soft, shiny silver metal that reacts vigorously with water.

Question

The electronic configurations of helium, neon and argon are shown. He Ne Ar Which row describes these gases? reactivity form of the gas electronic configuration A reactive monatomic incomplete outer shell of electrons B unreactive diatomic complete outer shell of electrons C unreactive diatomic incomplete outer shell of electrons D unreactive monatomic complete outer shell of electrons

Question

X is a shiny silver-coloured solid at room temperature and pressure. X is a good conductor of heat and electricity when solid. Which statement about X is correct? A X is an ionic compound or a metallic element. B X is a metallic element or a non-metallic element. C X is an alloy or a metallic element. D X is an alloy or a non-metallic element.

Question

Which elements can be combined to produce an alloy? 1 magnesium and aluminium 2 nitrogen and oxygen 3 iron and carbon 4 copper and zinc A 1, 3 and 4 B 1 and 2 C 2 and 3 D 4 only

Question

Three metals, L, M and N, are added separately to dilute hydrochloric acid and cold water. The results are shown. reaction with dilute reaction with metal hydrochloric acid cold water L hydrogen forms no reaction M hydrogen forms hydrogen forms N no reaction no reaction What is the order of reactivity of the metals? least most reactive reactive A L N M B M L N C N L M D N M L

Question

Which reaction produces carbon dioxide? A cracking of large hydrocarbon molecules B photosynthesis C reaction of a base with a carbonate D thermal decomposition of calcium carbonate

Question

A sample of air containing four gases only is analysed. 99.0% of the sample contains the two main gases in the same percentages as in clean, dry air. The remaining 1.0% of the sample contains argon and carbon dioxide. The gas that makes up 0.1% of the sample turns limewater milky. Which row shows the percentage composition of the sample of air? 99.0% of the sample 0.9% of the sample 0.1% of the sample A 78.0% nitrogen, 21.0% oxygen argon carbon dioxide B 78.0% nitrogen, 21.0% oxygen carbon dioxide argon C 78.0% oxygen, 21.0% nitrogen argon carbon dioxide D 78.0% oxygen, 21.0% nitrogen carbon dioxide argon

Question

Which substance contains two elements that are found in NPK fertilisers? A ammonium chloride B calcium hydroxide C potassium nitrate D sodium phosphate

Question

Which statement about sulfur is correct? A When sulfur is burned, it produces a substance that causes acid rain. B Sulfur is produced by the thermal decomposition of limestone. C Compounds of sulfur make up approximately 1% of unpolluted air. D Sulfur is a member of the family of elements called halogens.

Question

What are two adverse effects of particulates in the air? 1 acid rain 2 cancer 3 photochemical smog 4 respiratory problems A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

Question

Which formula represents a compound that is a member of the homologous series of alkanes? A C2H4 B C3H6 C C4H8 D C5H12

Question

Which statement about ethane is correct? A It rapidly decolourises aqueous bromine. B It does not burn. C It forms long-chain compounds called polymers. D It only contains single bonds between its atoms.

Question

Which raw material is used to make ethanol by fermentation? A carbon dioxide B ethene C glucose D natural gas

Question

Which statement about ethanoic acid is correct? A It contains a –COOH group. B It has a pH greater than pH 7. C It reacts with sodium carbonate to form hydrogen gas. D It reacts with copper to form copper(II) ethanoate.

Question

Which statement explains why the disposal of plastic waste leads to environmental problems? A Plastic waste forms toxic gases when it is burned. B Plastic waste contains many small molecules. C Plastic waste rapidly dissolves in the oceans. D Plastic waste reacts with both acids and bases.

Question

Substance X and four known substances, P, Q, R and S, are analysed by chromatography. The chromatogram produced is shown. X P Q R S Which statement about X is correct? A It is a mixture of P, Q and S. B It contains P and S only. C It contains P, S and another unknown substance. D It is a mixture of Q, R and S.

Question

Copper is insoluble in water. Copper(II) oxide is a solid that is insoluble in water but reacts with dilute hydrochloric acid. Which method is used to separate copper from a mixture of copper and copper(II) oxide? A dissolve the mixture in water then filter B dissolve the mixture in water then crystallise C react the mixture with dilute hydrochloric acid then filter D react the mixture with dilute hydrochloric acid then crystallise

Question

A salt, S, is dissolved in water and three tests are carried out on the solution formed. test result 1 aqueous sodium hydroxide is green precipitate forms, insoluble added in excess sodium hydroxide 2 dilute nitric acid is added no reaction 3 aqueous barium nitrate is added white precipitate forms to the solution from test 2 What is the identity of S? A copper(II) chloride B copper(II) sulfate C iron(II) chloride D iron(II) sulfate 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_11_2024_1.17 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.).