Chemistry 0620/11 October/November 2019: question paper and mark scheme

Question

The diagram shows a cup of hot tea. Which row describes the water particles in the air above the cup compared with the water particles in the cup? moving faster closer together A B C D

Question

A student is asked to measure the time taken for 0.4 g of magnesium carbonate to react completely with 25.0 cm3 of dilute hydrochloric acid. Which pieces of apparatus does the student need? A balance, stop-clock, pipette B balance, stop-clock, thermometer C balance, pipette, thermometer D stop-clock, pipette, thermometer

Question

A fractionating column is used to separate the hydrocarbon fractions in petroleum by fractional distillation. Which row describes the properties of the fractions that condense at the top of the fractionating column? size of molecule boiling point A large high B large low C small high D small low

Question

Some information about solid silver chloride and solid sodium chloride is shown. ● Silver chloride and sodium chloride do not dissolve in kerosene. ● Silver chloride is insoluble in water but sodium chloride is soluble in water. ● The boiling point of silver chloride is 1547 °C and the boiling point of sodium chloride is 1413 °C. Which processes are used to separate a mixture of solid silver chloride and solid sodium chloride? A Add kerosene, stir and then filter. B Add water, stir and then filter. C Add water, stir and then leave to crystallise. D Add water, stir and then perform fractional distillation.

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 52

Question

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.

Question

Substances P and Q both conduct electricity. P is a mixture of two different types of atom. Q is made of only one type of atom. Which row describes P and Q? P Q A alloy element B alloy compound C compound alloy D compound element

Question

Graphite is a form of carbon. Why can graphite be used as a lubricant? A Graphite contains unbonded electrons which move through the structure. B Graphite contains weak covalent bonds so the atoms move easily. C Graphite has a low melting point so it easily turns into a liquid. D Graphite has weak attractive forces between layers so they can move.

Question

The structure of a molecule is shown. H H H H H C C O C C H H H H H What is the formula of the molecule? A CHO B C2H5O C C4H8O D C4H10O

Question

During the electrolysis of concentrated hydrochloric acid, gases are produced at both electrodes. Which statement describes the test result for the gas collected at the negative electrode? A It bleaches damp litmus paper. B It burns with a ‘pop’. C It relights a glowing splint. D It turns limewater milky.

Question

Which statements about endothermic reactions are correct? 1 The energy of the products is greater than the energy of the reactants. 2 The energy of the reactants is greater than the energy of the products. 3 The temperature of the surroundings increases during the reaction. 4 The temperature of the surroundings decreases during the reaction. A 1 and 3 only B 1 and 4 only C 2 and 3 only D 2 and 4 only

Question

Equations for the formation of anhydrous cobalt(II) chloride and anhydrous copper(II) sulfate are shown. CoCl 2•6H2O → CoCl 2 + 6H2O CuSO4•5H2O → CuSO4 + 5H2O Which statement about the reactions is not correct? A Both reactions are exothermic. B Both reactions are reversible. C Hydrated cobalt(II) chloride changes colour from pink to blue. D Hydrated copper(II) sulfate changes colour from blue to white.

Question

A method used to investigate the rate of reaction of calcium carbonate with dilute hydrochloric acid under different conditions is shown. ● Place 50 cm3 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 gives the shortest time taken for the reaction to finish? volume of water temperature added / cm3 / °C A 10 30 B 10 50 C 40 30 D 40 50

Question

Which is a chemical change? A boiling water B cooking an egg C dissolving sugar D melting ice cubes

Question

Mercury(II) oxide, HgO, decomposes when heated. The equation is shown. 2HgO → 2Hg + O2 Why is this a reduction reaction? A The products weigh less than the reactants. B There are fewer reactants than products. C There is a gain of oxygen. D There is a loss of oxygen.

Question

Carbonic acid is a weak acid formed when carbon dioxide dissolves in water. What is the pH of the solution? A 1 B 5 C 7 D 9

Question

Solid X is tested as shown. reaction with dilute reaction with dilute aqueous sodium flame test hydrochloric acid hydroxide gas produced which no reaction red flame turned limewater milky What is X? A copper(II) carbonate B lithium carbonate C potassium carbonate D sodium sulfate

Question

Which oxide is basic? A carbon dioxide B sodium oxide C sulfur dioxide D water

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A method used to make copper(II) sulfate crystals is shown. 1 Place dilute sulfuric acid in a beaker. 2 Warm the acid. 3 Add copper(II) oxide until it is in excess. 4 Filter the mixture. 5 Evaporate the filtrate until crystals start to form. 6 Leave the filtrate to cool. What are the purposes of step 3 and step 4? step 3 step 4 A to ensure all of the acid has reacted to obtain solid copper(II) sulfate B to ensure all of the acid has reacted to remove the excess of copper(II) oxide C to speed up the reaction to obtain solid copper(II) sulfate D to speed up the reaction to remove the excess of copper(II) oxide

Question

Which set of elements shows the change from metallic to non-metallic character across a period of the Periodic Table? A beryllium → magnesium → calcium B fluorine → bromine → iodine C oxygen → boron → lithium D sodium → silicon → chlorine

Question

Which pair of elements reacts together most violently? A chlorine and lithium B chlorine and potassium C iodine and lithium D iodine and potassium

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What is not a typical property of a transition element? A acts as a catalyst B forms coloured compounds C has a high melting point D has a low density

Question

Part of the Periodic Table is shown. Which element is used to provide an inert atmosphere? A B C D

Question

Some properties of substance X are listed. ● It conducts electricity when molten. ● It has a high melting point. ● It burns in oxygen and the oxide dissolves in water to give a solution with pH 11. What is X? A a covalent compound B a macromolecule C a metal D an ionic compound

Question

Four different metals are reacted with an equal volume of dilute hydrochloric acid. The results of the reactions are shown. rate of metal effervescence calcium very high copper none iron low magnesium high What is the order of reactivity of the four metals starting with the most reactive? A iron → magnesium → calcium → copper B magnesium → calcium → copper → iron C copper → iron → magnesium → calcium D calcium → magnesium → iron → copper

Question

Iron is extracted from its ore in a blast furnace. The equations for four different reactions are shown. 1 4Fe + 3CO2 → 2Fe2O3 + 3C 2 CO2 → C + O2 3 CO2 + C → 2CO 4 Fe2O3 + 3CO → 2Fe + 3CO2 Which equations represent reactions that occur in the blast furnace? A 1 and 2 only B 1 and 3 only C 2 and 3 only D 3 and 4 only

Question

Which statement is correct? A Aluminium is used in the manufacture of aircraft because it has a high density. B Copper is used for cooking utensils because it is a good conductor of heat. C Mild steel is used for car bodies because it is resistant to corrosion. D Stainless steel is used for cutlery because it is a conductor of electricity.

Question

River water contains soluble impurities, insoluble impurities and bacteria. River water is made safe to drink by filtration and chlorination. Which statement is correct? A Filtration removes bacteria and insoluble impurities, and chlorination removes soluble impurities. B Filtration removes insoluble impurities, and chlorination kills the bacteria. C Filtration removes soluble and insoluble impurities, and chlorination kills the bacteria. D Filtration removes soluble impurities and bacteria, and chlorination removes insoluble impurities.

Question

Clean, dry air contains nitrogen, oxygen and small amounts of other gases. The noble gases have been left out of the table. Which row shows the composition of clean, dry air? nitrogen / % oxygen / % other gases A 21 78 small amount of carbon dioxide B 21 78 small amount of carbon monoxide C 78 21 small amount of carbon dioxide D 78 21 small amount of carbon monoxide

Question

The apparatus shown is set up and left for a week. damp iron wool air water Which diagram shows the level of the water at the end of the week? A B C D

Question

Farmers add calcium oxide (lime) and ammonium salts to their fields. The compounds are not added at the same time because they react with each other. Which gas is produced in this reaction? A ammonia B carbon dioxide C hydrogen D nitrogen

Question

Which information about carbon dioxide and methane is correct? carbon dioxide methane A formed when vegetation decomposes key B greenhouse gas = true C present in unpolluted air = false D produced during respiration

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What is not a use of sulfur dioxide? A as a bleach B as a food preservative C in the manufacture of wood pulp for paper D treating acidic soils

Question

Which process is used to obtain lime from limestone? A cracking B fractional distillation C neutralisation D thermal decomposition

Question

Petroleum is separated by fractional distillation. Which statement about the fractions produced is correct? A Bottled gas for heating and cooking is obtained from the naphtha fraction. B Diesel oil is used as a fuel for jet aircraft. C Substances used to make polishes are obtained from the lubricating fraction. D The kerosene fraction contains many useful waxes.

Question

Which compounds have similar chemical properties? A butanol and butanoic acid B ethane and ethene C methane and butane D propene and propanol

Question

Which statement about a molecule of ethane is correct? A An ethane molecule has at least one double covalent bond. B It has C–H and C–O bonds. C An ethane molecule has seven covalent bonds. D Its bonds are formed by the transfer of electrons.

Question

Which products are obtained by the cracking of an alkane? alkene hydrogen water A B C D

Question

Which statements about aqueous ethanoic acid are correct? 1 It has a pH value of 10. 2 It reacts with metal carbonates to produce carbon dioxide gas. 3 It reacts with magnesium metal to produce hydrogen gas. A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

Question

The diagram shows the structure of a monomer and of the polymer made from it. H H H H n C C C C H H H H n What are the monomer and polymer? monomer polymer A ethane poly(ethane) B ethane poly(ethene) C ethene poly(ethane) D ethene poly(ethene) 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 89–103 104 105 106 107 108 109 110 111 112 114 116 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.).