Cambridge International Examinations Cambridge International General Certificate of Secondary Education

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1 ambridge International Examinations ambridge International General ertificate of Secondary Education * * HEMISTRY 0620/02 Paper 2 Multiple hoice (Extended) For Examination from 2016 SPEIMEN PPER dditional Materials: Multiple hoice nswer Sheet Soft clean eraser Soft pencil (type or H is recommended) 45 minutes RE THESE INSTRUTIONS FIRST Write in soft pencil. o not use staples, paper clips, glue or correction fluid. Write your name, entre number and candidate number on the nswer Sheet in the spaces provided unless this has been done for you. O NOT WRITE IN NY ROES. There are forty questions on this paper. nswer all questions. For each question there are four possible answers,, and. hoose the one you consider correct and record your choice in soft pencil on the separate nswer Sheet. Read the instructions on the nswer Sheet very carefully. Each correct answer will score one mark. mark will not be deducted for a wrong answer. ny rough working should be done in this booklet. copy of the Periodic Table is printed on page 18. Electronic calculators may be used. The syllabus is accredited for use in England, Wales and Northern Ireland as a ambridge International Level 1/Level 2 ertificate. This document consists of 18 printed pages. ULES 2014 [Turn over

2 1 mino acids are colourless and can be separated and identified by chromatography. 2 glass cover chromatography paper beaker solvent What additional apparatus is required to identify the amino acids present in a mixture? a locating agent a ruler a ruler and a locating agent neither a ruler or a locating agent 2 The diagram shows the diffusion of hydrogen chloride and ammonia in a glass tube. The gases are given off by the solutions at each end of the tube. When hydrogen chloride and ammonia mix they produce a white solid, ammonium chloride. Which line shows where the white solid is formed? cotton wool soaked in concentrated ammonia solution cotton wool soaked in concentrated hydrochloric acid ULES /02/SP/16

3 3 3 The diagram shows the structure of an atom. + + n n key + n = proton = neutron = electron Which diagram shows the structure of an isotope of this atom? + + n n n n n n n n n 4 The table shows the structure of different atoms and ions. particle proton number nucleon number number of protons number of neutrons number of electrons Mg W 12 Mg 2+ X F Y 9 F Z What are the values of W, X, Y and Z? W X Y Z ULES /02/SP/16 [Turn over

4 4 5 Iron is a metal. The structure of iron is described as a lattice of positive ions in a sea of electrons. Which of the following statements about iron are correct? 1 iron conducts electricity because the electrons are free to move 2 iron has a high melting point due to the strong covalent bonds 3 iron is an alloy 4 iron is malleable because the layers of atoms can slide over one another 1 only 1 and 3 1 and 4 2, 3 and 4 6 Which two elements react together to form an ionic compound? element R T X Z electronic structure 2,4 2,8 2,8,1 2,8,7 R and T T and X X and Z Z and R 7 Ethene is an unsaturated hydrocarbon. H H H H Which description of the bonding in ethene is correct? ll atoms in the molecule have a share of eight electrons. Each carbon atom shares two of its electrons with hydrogen atoms and two of its electrons with a carbon atom. Each carbon atom shares two of its electrons with hydrogen atoms and one of its electrons with a carbon atom. The two carbon atoms share a total of six electrons with other atoms. 8 What is the relative molecular mass, M r, of butanol? ULES /02/SP/16

5 9 The chemical formulae of two substances, W and X, are given. 5 W Nal Si 3 O 8 X al 2 Si 2 O 8 Which statements are correct? 1 W and X contain the same amount of oxygen. 2 W contains three times as much silicon as X. 3 X contains twice as much aluminium as W. 1 and 2 1 and 3 2 and 3 1, 2 and 3 10 What is the concentration of a solution containing 1.0 g of sodium hydroxide in 250 cm 3 of solution? mol / dm mol / dm mol / dm mol / dm 3 11 Four students prepared hydrated copper(ii) sulfate by adding an excess of dilute sulfuric acid to copper(ii) oxide. Each student used a different mass of copper(ii) oxide. uo dilute sulfuric acid uso 4.5H 2 O M r = 80 M r = 250 fter the copper(ii) sulfate had crystallised the students dried and weighed the crystals. Which student produced the highest percentage yield of hydrated copper(ii) sulfate? mass of copper(ii) oxide used / g mass of crystals produced / g ULES /02/SP/16 [Turn over

6 cm 3 of ethyne, 2 H 2, are reacted with 500 cm 3 of oxygen. The equation for the reaction is 2 2 H 2 (g) + 5O 2 (g) 4O 2 (g) + 2H 2 O(l) What is the total volume of gas remaining at the end of the reaction? (all volumes are measured at room temperature and pressure) 400 cm cm cm cm 3 13 ifferent metals were tested using the apparatus shown. metal 1 V metal 2 Which pair of metals would produce the largest voltage? copper and silver magnesium and silver magnesium and zinc zinc and copper 14 Three electrolysis cells are set up. Each cell has inert electrodes. The electrolytes are listed below. cell 1 cell 2 cell 3 aqueous sodium chloride dilute sulfuric acid molten lead(ii) bromide In which of these cells is a gas formed at both electrodes? 1 and 2 1 and 3 2 only 3 only ULES /02/SP/16

7 7 15 The statements refer to the electrolysis of concentrated copper(ii) chloride solution. 1 Electrons are transferred from the cathode to the copper(ii) ions. 2 Electrons move around the circuit from the cathode to the anode. 3 hloride ions are attracted to the anode. 4 Hydroxide ions transfer electrons to the cathode. Which statements about the electrolysis of concentrated copper(ii) chloride are correct? 1 and 3 1 and 4 2 and 3 2 and 4 16 Water can be used to produce hydrogen gas. 2H 2 O 2H 2 + O 2 Which row describes bond breaking in the reactant? endothermic endothermic exothermic exothermic heat absorbed heat released heat absorbed heat released 17 initrogen tetroxide, N 2 O 4, breaks down into nitrogen dioxide, NO 2. N 2 O 4 (g) 2NO 2 (g) The reaction is reversible and endothermic. Which conditions will give the largest yield of nitrogen dioxide, NO 2? temperature high high low low pressure high low high low ULES /02/SP/16 [Turn over

8 18 The apparatus shown can be used to measure the rate of some chemical reactions. 8 gas syringe reaction mixture For which two reactions would this apparatus be suitable? reaction 1 reaction 2 reaction 3 reaction 4 gno 3 (aq) + Hl(aq) gl(s) + HNO 3 (aq) 2H 2 O 2 (aq) 2H 2 O(I) + O 2 (g) MgO(s) + 2Hl(aq) Mgl 2 (aq) + H 2 O(I) ZnO 3 (s) + 2Hl(aq) Znl 2 (aq) + O 2 (g) + H 2 O(I) 1 and 2 1 and 3 2 and 4 3 and 4 19 student investigates the rate of reaction between magnesium and excess sulfuric acid. The volume of hydrogen given off in the reaction is measured over time. The graph shows the results of two experiments, R and S. volume of hydrogen given off R S time Which change in conditions would cause the difference between R and S? catalyst is added in S. The acid is more concentrated in R than in S. The magnesium is less finely powdered in R than in S. The temperature in R is lower than in S. ULES /02/SP/16

9 20 Which of these reactions shows only reduction? 9 u e u Fe 2 O 3 + 3O 2Fe + 3O 2 Hl + NaOH Nal + H 2 O Mg + ZnSO 4 Zn + MgSO 4 21 The red colour in some pottery glazes may be formed as a result of the reactions shown. heat uo 3 uo + O 2 uo + SnO u + SnO 2 These equations show that is oxidised and is reduced. Which substances correctly complete gaps 1 and 2 in the above sentence? 1 2 O 2 uo 3 uo SnO SnO 2 uo SnO uo 22 cids are compounds which donate protons (hydrogen ions). NH 3 (aq) + H 2 O(l) NH 4 + (aq) + OH (aq) Which compound in this equation is behaving as an acid? ammonia ammonium hydroxide none of them water ULES /02/SP/16 [Turn over

10 10 23 The reactions of four different oxides W, X, Y and Z are shown. W reacts with hydrochloric acid but not sodium hydroxide. X reacts with both hydrochloric acid and sodium hydroxide. Y does not react with either hydrochloric acid or sodium hydroxide. Z reacts with sodium hydroxide but not hydrochloric acid. Which row shows the correct types of oxide? acidic basic amphoteric neutral W Z X Y X Y W Z Z X Y W Z W X Y 24 solution contains barium ions and silver ions and one type of anion. What could the anion be? chloride only nitrate only sulfate only chloride or nitrate or sulfate 25 mixture containing two anions was tested and the results are shown below. test dilute nitric acid added dilute nitric acid added, followed by aqueous silver nitrate result effervescence of a gas which turned limewater milky yellow precipitate formed Which anions were present? carbonate and chloride carbonate and iodide sulfate and chloride sulfate and iodide ULES /02/SP/16

11 11 26 Part of the Periodic Table is shown. The letters are not the chemical symbols of the elements. W X Z Y Which statement about the elements is not correct. W has two electrons in the outermost shell. Y is in Group IV of the Periodic Table. X and Y bond covalently to form a molecule XY 4. Z has more metallic character than Y. 27 statine is an element in Group VII of the Periodic Table. It has only ever been produced in very small amounts. What are the likely properties of astatine? colour state reaction with aqueous potassium iodide black solid no reaction dark brown gas brown colour green solid no reaction yellow liquid brown colour ULES /02/SP/16 [Turn over

12 12 28 The table shows the results of adding three metals, P, Q and R, to dilute hydrochloric acid and to water. metal dilute hydrochloric acid water P Q R hydrogen produced no reaction hydrogen produced hydrogen produced no reaction no reaction What is the order of reactivity of the metals? most reactive least reactive P R Q P Q R R Q P R P Q 29 ompound X is heated with carbon using the apparatus shown. compound X and carbon reaction tube heat limewater brown solid is formed in the reaction tube and the limewater turns cloudy. What is compound X? calcium oxide copper(ii) oxide magnesium oxide sodium oxide ULES /02/SP/16

13 13 30 Zinc is extracted from zinc blende. Zinc blende is an ore of zinc and consists mainly of zinc sulfide. One of the steps in the process involves zinc sulfide reacting with oxygen from the air. What is the equation for this reaction? 2ZnS + 3O 2 2ZnO + 2SO 2 2ZnS + O 2 2Zn + SO 2 2ZnS + O 2 2ZnO + S ZnS + 2O 2 ZnSO 4 31 The diagram shows the carbon cycle. carbon dioxide in atmosphere X gradual production of fossil fuels Which process is shown by the arrow marked X? coal, oil and natural gas combustion photosynthesis respiration transpiration ULES /02/SP/16 [Turn over

14 32 catalytic converter removes harmful gases from motor car exhausts. 14 Which reaction does not take place in a catalytic converter? 2O + O 2 2O 2 N 2 + 2O 2 2NO + 2O 2NO 2 N 2 + 2O 2 2NO 2 + 4O N 2 + 4O 2 33 The diagram shows some reactions of substance Y. heat with an ammonium compound ammonia substance Y heat with dilute acid a salt Which type of substance is Y? an alcohol a base a catalyst a metal ULES /02/SP/16

15 34 Which row shows the conditions for the manufacture of sulfuric acid? 15 pressure / atm temperature / catalyst vanadium(v) oxide iron iron vanadium(v) oxide 35 ir containing an acidic impurity was neutralised by passing it through a column containing substance X. substance X acidic air neutralised air What is substance X? calcium oxide sand sodium chloride concentrated sulfuric acid ULES /02/SP/16 [Turn over

16 16 36 In an oil refinery, petroleum is separated into useful fractions. The diagram shows some of these fractions. pre-heat 400 refinery gases gasoline X diesel oil Y Z What are fractions X, Y and Z? X Y Z fuel oil bitumen paraffin (kerosene) fuel oil paraffin (kerosene) bitumen paraffin (kerosene) bitumen fuel oil paraffin (kerosene) fuel oil bitumen 37 Which reaction does not take place in the dark? H 4 + 2O 2 O 2 + 2H 2 O H 4 + l 2 H 3 l + Hl 2 H 4 + H 2 O 2 H 5 OH 2 H 4 + H 2 2 H 6 38 Ethane and ethene are both hydrocarbons. Ethane reacts with chlorine and ethene reacts with bromine. Which row describes the type of reaction that ethane and ethene undergo? ethane addition addition substitution substitution ethene addition substitution substitution addition ULES /02/SP/16

17 17 39 Esters are made by reacting an alcohol with a carboxylic acid. Which acid and alcohol react together to form the following ester? H 3 H 2 O OH 3 propanoic acid and ethanol propanoic acid and methanol ethanoic acid and ethanol ethanoic acid and methanol 40 Which structure represents a polymer? H O H O N N N H O ULES /02/SP/16

18 18 Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable effort has been made by the publisher (ULES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the publisher will be pleased to make amends at the earliest possible opportunity. ambridge International Examinations is part of the ambridge ssessment Group. ambridge ssessment is the brand name of University of ambridge Local Examinations Syndicate (ULES), which is itself a department of the University of ambridge. ULES /02/SP/16

Cambridge International Examinations Cambridge International General Certificate of Secondary Education

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