Chemistry 0620/12 February/March 2022: question paper and mark scheme

Question

Which change of state is an exothermic process? A condensation B evaporation C melting D sublimation

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In which state does 1 dm3 of methane contain the most particles? A gas at 100 °C B gas at room temperature C liquid D solid

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Which dye on the chromatogram is a pure substance? A B C D

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Which piece of apparatus is used to measure exactly 5.00 cm3 of a liquid? A 5 cm3 beaker B 10 cm3 measuring cylinder C 25 cm3 pipette D 50 cm3 burette

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Fermentation of sugar produces a mixture of ethanol solution and solid yeast. How is the solid yeast removed from the mixture? A crystallisation B distillation C filtration D fractional distillation

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Matter exists as elements, compounds and mixtures. Which row identifies an element, a compound and a mixture? element compound mixture A calcium potassium carbonate sodium chloride B brass sodium chloride air C calcium sodium chloride brass D sodium chloride water potassium carbonate

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Which pair of statements about diamond and graphite is correct? diamond graphite A Diamond and graphite are both pure carbon. They are both macromolecules. B Diamond and graphite can both be used as electrodes. Graphite is also used as a lubricant. C Diamond has covalent bonds. Graphite has ionic bonds. D Diamond is hard with a high melting point. Graphite is soft with a low melting point. 52

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An isotope of chromium is represented by 24 Cr. Which statement about an atom of this isotope of chromium is correct? A It contains 24 electrons. B It contains 24 neutrons. C It contains 28 protons. D It contains 52 neutrons.

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Sodium is in Group I of the Periodic Table and chlorine is in Group VII. Which row describes what happens when sodium bonds ionically with chlorine? sodium atoms ion formed chlorine atoms ion formed A gain an electron Na– lose an electron Cl + B gain an electron Na+ lose an electron Cl – C lose an electron Na– gain an electron Cl + D lose an electron Na+ gain an electron Cl –

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Caesium fluoride is an ionic compound. Which statements about caesium fluoride are correct? 1 It conducts electricity when solid. 2 It has a high melting point. 3 It is soluble in water. 4 It is highly volatile. A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

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The structure of a molecule of a compound is shown. key =C =H =O What is the formula of this compound? A C3H7O B C3H8O C C8H3O D C8HO3

Question

Calcium carbonate, CaCO3, reacts with dilute hydrochloric acid to produce carbon dioxide. The equation for the reaction is shown. The relative formula mass of calcium carbonate is 100. CaCO3 + 2HCl → CaCl 2 + H2O + CO2 10 g of calcium carbonate is reacted with an excess of dilute hydrochloric acid. Which mass of carbon dioxide is produced? A 2.2 g B 2.8 g C 4.4 g D 44 g

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Molten sodium chloride and concentrated aqueous sodium chloride are electrolysed using platinum electrodes. What are the products at the negative electrode (cathode) in each electrolysis? molten concentrated aqueous sodium chloride sodium chloride A hydrogen hydrogen B hydrogen sodium C sodium hydrogen D sodium sodium

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An object is electroplated with silver using an aqueous silver salt as the electrolyte. Which row is correct? the object to be the other electrode electroplated is the is made from A anode carbon B anode silver C cathode carbon D cathode silver

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Which row describes the changes that occur in an endothermic reaction? energy change temperature A energy given out to decreases the surroundings B energy given out to increases the surroundings C energy taken in from decreases the surroundings D energy taken in from increases the surroundings

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Which statement about fuels is correct? A Heat energy is only produced by burning fuels. B Hydrogen is used as a fuel although it is difficult to store. C Methane is a good fuel because it produces only water when burned. D Uranium is burned in air to produce energy.

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A sequence of changes involving sulfur is shown. change 1 change 2 S S SO2 solid liquid gas Which row describes the changes? change 1 change 2 A chemical chemical B chemical physical C physical chemical D physical physical

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Magnesium is added to dilute hydrochloric acid. 25 cm3 of gas is given off in the first 30 s of the reaction. The experiment is repeated at a lower temperature. All other reaction conditions are the same. Which volume of gas is produced in the first 30 s of this reaction? A 15 cm3 B 25 cm3 C 30 cm3 D 50 cm3

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The equation for the reaction between magnesium and copper(II) oxide is shown. Mg + CuO → MgO + Cu Which substance is oxidised? A Cu B CuO C Mg D MgO

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Methyl orange is added to dilute hydrochloric acid and to aqueous sodium hydroxide. What is the colour of the methyl orange in each solution? colour in dilute colour in aqueous hydrochloric acid sodium hydroxide A orange red B red yellow C red orange D yellow red

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Compound X is dissolved in water and two separate samples of the solution are tested. The results of the tests are shown. test observation add aqueous sodium hydroxide a white precipitate forms which is insoluble in excess acidify with dilute nitric acid a yellow precipitate forms and add aqueous silver nitrate What is compound X? A calcium chloride B calcium iodide C zinc chloride D zinc iodide

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Which statement about the Periodic Table is correct? A Elements with the highest atomic number in each period are metallic. B Elements with the lowest group numbers are non-metals. C Elements with similar chemical properties are placed in groups. D Elements with similar physical properties are placed in periods.

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Part of the Periodic Table is shown. Which element is a soft solid that reacts violently with cold water? A B C D

Question

Three properties of element X are listed. ● It contains atoms with a full outer shell of electrons. ● It is monoatomic. ● It is unreactive. In which part of the Periodic Table is the element placed? A Group I B Group VII C Group VIII D transition elements

Question

Some properties of the elements in Group VII of the Periodic Table are shown. melting boiling element colour point / °C point / °C F –220 –188 pale yellow Cl –101 –35 green Br –7 59 brown I 114 184 At 302 380 Which statement is correct? A Bromine is a brown solid at room temperature. B Fluorine is a pale yellow gas at room temperature. C Iodine is a brown liquid at room temperature. D Astatine is a black liquid at room temperature.

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Which process is used to obtain the metal calcium from its ore? A electrolysis B oxidation with carbon C reduction with carbon D thermal decomposition

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Which row links the property of a metal to its use? property use A high density aircraft bodies B high reactivity food containers C good electrical conductor cooking pans D ductile electrical wiring

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The table gives some properties of an element. melting point in °C 3422 appearance of the element grey appearance of the chloride of the element dark blue density in g / cm3 19.2 electrical conductivity when solid good Which other property does this element have? A acts as a catalyst B brittle C forms an acidic oxide D highly reactive with water

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A metal reacts vigorously with cold water. Which statement about the metal is correct? A It is above hydrogen in the reactivity series. B It is below magnesium in the reactivity series. C Its oxide can be reduced with carbon. D It does not react with dilute acids.

Question

Which row describes the colour changes when water is added to anhydrous cobalt(II) chloride and anhydrous copper(II) sulfate? anhydrous anhydrous cobalt(II) chloride copper(II) sulfate A blue to pink white to blue B blue to white blue to pink C pink to blue blue to white D white to blue pink to blue

Question

The gases produced by a burning fuel are passed through solution Z using the apparatus shown. The fuel contains compounds of sulfur. to vacuum pump burning fuel solution Z Which row identifies solution Z and the result obtained when the fuel contains compounds of sulfur? solution Z result A acidified potassium manganate(VII) turns colourless B acidified potassium manganate(VII) turns purple C litmus bleached D litmus turns blue

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Which information about carbon dioxide and methane is correct? carbon dioxide methane A formed when vegetation decomposes key B greenhouse gas = correct C present in unpolluted air = not correct D produced during respiration

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Which row identifies uses of sulfur? use 1 use 2 use 3 A making ammonia bleaching wood pulp food preservative B making sulfuric acid bleaching wood pulp food preservative C making sulfuric acid food preservative as an NPK fertiliser D making ammonia food preservative as an NPK fertiliser

Question

Which statements about lime are correct? 1 Lime is made by heating calcium carbonate (limestone). 2 Lime is used to desulfurise flue gases. 3 Lime is used to treat alkaline soil. 4 The chemical name for lime is calcium oxide. A 1 and 3 B 1, 2 and 4 C 1 and 4 only D 2, 3 and 4

Question

Which structure is correctly named? A B C D H H H H H H H H H C C C O H H C C H H C C O H C C C H H H O H H H H H H H ethanoic acid ethene ethanol propane

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The fractional distillation of petroleum produces a series of fractions with different uses. Which row identifies a use for a fraction? fraction use A bitumen jet fuel B gas oil cooking C kerosene making roads D naphtha making chemicals

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Ethene and propene are both members of the same homologous series. Which statements explain why ethene and propene have similar chemical properties? 1 They are both hydrocarbons. 2 They are both made by cracking. 3 They have the same functional group. A 1 and 2 B 1 and 3 C 2 only D 3 only

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Which statement about ethane is correct? A It decolourises bromine water. B It burns in excess oxygen to form water and carbon dioxide. C Its molecular formula is C2H4. D Its atoms are joined together by ionic bonding.

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Which statements about ethanol are correct? 1 Ethanol is used as a solvent. 2 Ethanol can be made directly from ethane. 3 Ethanol is a covalent compound. A 1 only B 1 and 2 C 1 and 3 D 2 and 3

Question

Polymers are long-chain molecules made from small molecules linked together. Four polymers or types of polymer are listed. 1 carbohydrates 2 nylon 3 proteins 4 Terylene Which polymers or types of polymer are synthetic? A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4 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.).