O Level Chemistry Past Paper 2019 PDF

2 1 Sodium chloride is a liquid at 900 °C. How are the particles arranged and how do the particles move in sodium chloride at 900 °C? arrangement of particles motion of particles A regular vibrate about a fixed poi...

2 1 Sodium chloride is a liquid at 900 °C. How are the particles arranged and how do the particles move in sodium chloride at 900 °C? arrangement of particles motion of particles A regular vibrate about a fixed point B regular move randomly C random vibrate about a fixed point D random move randomly 2 2.00 g of powdered calcium carbonate is added to 50.0 cm3 of hydrochloric acid. Which apparatus is used to measure the calcium carbonate and the hydrochloric acid? calcium carbonate hydrochloric acid A balance burette B balance thermometer C pipette burette D pipette thermometer 3 Rock salt is a mixture of sand and sodium chloride. Sodium chloride is soluble in water but not in hexane. Sand is insoluble in both water and hexane. What is required to separate the sand from the sodium chloride? 1 filter paper 2 fractionating column 3 hexane 4 water A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4 © UCLES 2019 0971/11/M/J/19  3 4 The colours in four dyes are separated using chromatography. Which chromatogram shows an insoluble colour? A B C D baseline 19 5 Which statement about an atom of fluorine, 9 F, is correct? A It contains more protons than neutrons. B It contains a total of 28 protons, neutrons and electrons. C Its isotopes contain different numbers of protons. D Its nucleus contains 9 neutrons. 6 Calcium reacts with chlorine to produce calcium chloride. What happens when a calcium ion forms during this reaction? A The calcium atom gains one electron. B The calcium atom gains two electrons. C The calcium atom loses one electron. D The calcium atom loses two electrons. 7 Which row describes the formation of single covalent bonds in methane? A atoms share a pair of electrons both atoms gain a noble gas electronic structure B atoms share a pair of electrons both atoms have the same number of electrons in their outer shell C electrons are transferred from one both atoms gain a atom to another noble gas electronic structure D electrons are transferred from one both atoms have the same number atom to another of electrons in their outer shell © UCLES 2019 0971/11/M/J/19 [Turn over  4 8 Diamond and graphite have giant covalent structures of carbon atoms. Which statement describes graphite? A It has a strong, rigid three-dimensional structure. B It has four strong covalent bonds between each carbon atom. C It has layers, which can slide over each other. D It has no free electrons, so does not conduct electricity. 9 The compound magnesium nitrate has the formula Mg(NO3)2. What is the relative formula mass of magnesium nitrate? A 86 B 134 C 148 D 172 10 Four substances are electrolysed using inert electrodes. Which row describes the electrode products? substance anode product cathode product A concentrated aqueous sodium chloride hydrogen chlorine B concentrated hydrochloric acid chlorine oxygen C dilute sulfuric acid oxygen hydrogen D molten lead bromide lead bromine 11 Dissolving ammonium chloride in water is an endothermic change. Which row shows the energy change and temperature change of the mixture during the dissolving of ammonium chloride? energy change temperature change A energy is absorbed decrease B energy is absorbed increase C energy is released decrease D energy is released increase 12 Which process is a physical change? A burning wood B cooking an egg C melting an ice cube D rusting iron © UCLES 2019 0971/11/M/J/19  5 13 Hydrogen peroxide solution decomposes very slowly at room temperature to produce oxygen gas. This gas forms a rising foam when liquid detergent is added. Five test-tubes are half filled with hydrogen peroxide solution. A drop of liquid detergent is added to each one. Different metal oxides are added to four of the test-tubes and the height of the foam formed after 1 minute is measured. The results are shown. height of metal oxide foam / cm no metal oxide added 0.1 aluminium oxide 0.1 calcium oxide 0.2 copper(II) oxide 2.3 manganese(IV) oxide 5.4 Which conclusion can be drawn from these results? A Metal oxides do not affect the rate of this reaction. B All metal oxides increase the rate of this reaction and act as catalysts. C Manganese(IV) oxide is the best catalyst of the four metal oxides tested. D Only transition element oxides increase the rate of this reaction. 14 When blue-green crystals of nickel(II) sulfate are heated, water is produced and a yellow solid remains. When water is added to the yellow solid, the blue-green colour returns. Which process describes these changes? A combustion B corrosion C neutralisation D reversible reaction © UCLES 2019 0971/11/M/J/19 [Turn over  6 15 In a blast furnace, iron is extracted when iron(III) oxide reacts with carbon monoxide. The equation is shown. Fe2O3 + 3CO → 2Fe + 3CO2 Which substance is oxidised and which is reduced? oxidised reduced A CO Fe2O3 B CO2 Fe C Fe CO2 D Fe2O3 CO 16 Four different solutions are separately tested with blue litmus and with methyl orange. Each solution is known to be either acidic or alkaline. The results are shown. result with result with solution blue litmus methyl orange 1 red red 2 red yellow 3 blue yellow 4 blue yellow Which statement is correct? A Solutions 1 and 4 are acidic. B Solutions 1 and 2 are alkaline. C Solutions 3 and 4 are alkaline. D Solutions 3 and 4 are acidic. 17 The positions of elements W, X, Y and Z in the Periodic Table are shown. W Y X Z Which elements form basic oxides? A W, X and Y B W and X only C Y only D Z only © UCLES 2019 0971/11/M/J/19  7 18 How could crystals of a pure salt be prepared from dilute sulfuric acid? A add an excess of aqueous sodium hydroxide, filter, evaporate the filtrate to crystallisation point B add an excess of copper(II) carbonate, filter, evaporate the filtrate to dryness C add an excess of copper metal, filter, evaporate the filtrate to crystallisation point D add an excess of zinc oxide, filter, evaporate the filtrate to crystallisation point 19 The results of two tests on a solution of compound Q are shown. test observation add ammonia solution green precipitate formed add dilute nitric acid followed white precipitate formed by aqueous barium nitrate What is Q? A iron(II) chloride B iron(II) sulfate C iron(III) chloride D iron(III) sulfate 20 The properties of an element are shown. electrical conductivity density reaction with water high low reacts violently with cold water Which element has these properties? A B C D 21 Which statement about elements in Group I and Group VII of the Periodic Table is correct? A Bromine reacts with potassium chloride to produce chlorine. B Iodine is a monoatomic non-metal. C Lithium has a higher melting point than potassium. D Sodium is more reactive with water than potassium. © UCLES 2019 0971/11/M/J/19 [Turn over  8 22 Which row describes the properties of a transition element? melting forms coloured density point compounds A high low no B high high yes C low low no D low low yes 23 Which statement about elements in Group VIII of the Periodic Table is correct? A They all have a full outer shell of electrons. B They all react with Group I elements to form ionic compounds. C They are all diatomic molecules. D They are all liquids at room temperature. 24 The diagrams show the structure of two substances used to make electrical conductors. X Y Which statement correctly describes X and Y? A X is a pure metal and Y is a compound. B X is a pure metal and Y is an alloy. C X is a solid and Y is a liquid. D X is harder and stronger than Y. © UCLES 2019 0971/11/M/J/19  9 25 The reactions of three metals, P, Q and R, are shown. metal reacts with metal reacts dilute hydrochloric acid with water P yes no Q no no R yes yes What is the order of reactivity of the metals? most least reactive reactive A P Q R B Q R P C R Q P D R P Q 26 Iron is extracted from its ore in a blast furnace. Hematite, coke, limestone and hot air are added to the furnace. Which explanation is not correct? A Coke burns and produces a high temperature. B Hematite is the ore containing the iron as iron(III) oxide. C Hot air provides the oxygen for the burning. D Limestone reduces the iron(III) oxide to iron. 27 Why is aluminium used to make containers for storing food? A It conducts electricity. B It has a high melting point. C It is resistant to corrosion. D It is strong. © UCLES 2019 0971/11/M/J/19 [Turn over  10 28 Water can be treated by filtration then chlorination. Which uses do not need water of this quality? 1 water for cooling in industry 2 water for washing clothes 3 water for drinking A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only 29 Four sources of air pollution are listed. 1 burning fossil fuels containing sulfur 2 nitrogen reacting with oxygen in car engines 3 incomplete combustion of carbon fuels 4 adding lead compounds to petrol Which sources produce acid rain? A 1 and 2 B 1 and 3 C 2 and 3 D 3 and 4 30 The diagram shows an experiment to investigate how paint affects the rusting of iron. P Q iron painted iron air water What happens to the water level in tubes P and Q? tube P tube Q A falls rises B no change rises C rises falls D rises no change © UCLES 2019 0971/11/M/J/19  11 31 A mixture of two substances, R and S, is heated. The damp red litmus paper turns blue. damp red litmus paper R and S gentle heat What are R and S? R S A a basic oxide ammonium chloride B a basic oxide sodium nitrate C an acidic oxide ammonium chloride D an acidic oxide sodium nitrate 32 Which statement describes a disadvantage of sulfur dioxide? A It can be used as a bleach when making wood pulp. B It can be used to kill bacteria in food. C It can be used to manufacture sulfuric acid. D It dissolves in water to form acid rain. © UCLES 2019 0971/11/M/J/19 [Turn over  12 33 The diagram represents a lime kiln used to heat limestone to a very high temperature. waste gases lime kiln limestone fuel in fuel in air in air in X What leaves the kiln at X? A calcium carbonate B calcium hydroxide C calcium oxide D calcium sulfate 34 What is the structure of ethanol? A B C D H H H H H O H H C C H C C H H C C H C C OH H H H H H OH H H © UCLES 2019 0971/11/M/J/19  13 35 Which fuel could be gasoline? Is it obtained from petroleum? yes no Is it used as Is it used as fuel for cars? fuel for cars? yes no yes no A B C D 36 A hydrocarbon W burns to form carbon dioxide and water. W decolourises bromine water. What is the name of W and what is its structure? name of W structure of W H H A ethane H C C H H H H H B ethane C C H H H H C ethene H C C H H H H H D ethene C C H H © UCLES 2019 0971/11/M/J/19 [Turn over  14 37 Why is ethanol a member of the homologous series of alcohols but propane is not? A Ethanol has two carbon atoms per molecule but propane has three. B Ethanol can be made from ethene but propane is obtained from petroleum. C Ethanol is a liquid but propane is a gas. D Ethanol contains the same functional group as other alcohols but propane does not. 38 Which statements about ethanol are correct? 1 It can be made by fermentation. 2 It is an unsaturated compound. 3 It burns in air and can be used as a fuel. A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only 39 Which statements about aqueous ethanoic acid are correct? 1 Ethanoic acid contains the functional group –COOH. 2 Ethanoic acid reacts with carbonates to produce hydrogen. 3 Ethanoic acid turns Universal Indicator paper blue. 4 Ethanoic acid has a pH lower than pH 7. A 1 and 2 B 1 and 3 C 1 and 4 D 2 and 4 40 Which naturally occurring polymers are found in foods? 1 complex carbohydrates 2 nylon 3 salts 4 proteins A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4 © UCLES 2019 0971/11/M/J/19