*20GCM2201* - CCEA

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Centre NumberCandidate NumberGeneral Certificate of Secondary Education2019GCSE ChemistryUnit 2*GCM22*Higher Tier*GCM22*[GCM22]WEDNESDAY 12 JUNE, MORNINGTIME1 hour 30 minutes.INSTRUCTIONS TO CANDIDATESWrite your Centre Number and Candidate Number in the spaces provided at the top of thispage.You must answer the questions in the spaces provided.Do not write outside the boxed area on each page or on blank pages.Complete in black ink only. Do not write with a gel pen.Answer all six questions.INFORMATION FOR CANDIDATESThe total mark for this paper is 100.Figures in brackets printed down the right-hand side of pages indicate the marks awardedto each question or part question.Quality of written communication will be assessed in Question 3(e).A Data Leaflet, which includes a Periodic Table of the Elements, is included in this questionpaper.11831*20GCM2201**20GCM2201*

1Iron is extracted from its ore in the Blast Furnace. The extraction involves redoxreactions.(a) (i) Name the ore from which iron is extracted in the Blast Furnace.[1](ii) Explain what is meant by the term redox.[1](b) (i) Name the reducing agent in the Blast Furnace and write balanced symbolequations to show the formation of this compound.Name:Equations:[6](ii) Write a balanced symbol equation for the reduction of iron ore in the BlastFurnace.[3]11831*20GCM2202**20GCM2202*

(c) Copper may be extracted from low grade ores in soil by phytomining. The firststage of this process involves plants absorbing copper(II) ions from the soil.(i) Explain how a solution of copper(II) ions is produced from the plants.[2](ii) In the next stage of the process, scrap iron is added to the solution ofcopper(II) ions and a displacement reaction occurs. Explain why iron candisplace copper from the solution.[1](iii) Write a half equation for the formation of copper from copper(II) ions.[3](iv) State one advantage of phytomining over traditional mining methods.[1][Turn over11831*20GCM2203**20GCM2203*

2Ammonia is manufactured in the Haber Process. An iron catalyst is used in thisprocess to increase the rate of the reaction.The balanced symbol equation for the reversible reaction in the Haber Process is:N2(g) 3H2(g) 2NH3(g)(a) Explain how a catalyst increases the rate of a chemical reaction.[2](b) The temperature and pressure used in the Haber Process are 450 C and200 atm. The reaction establishes a dynamic equilibrium.(i) What is meant by the term dynamic equilibrium?[2]11831*20GCM2204**20GCM2204*

(ii) State and explain the effect of increasing the temperature on the rate of thisreaction.Effect:Explanation:[4](iii) Use Le Châtelier’s Principle to state and explain the effect of increasing thepressure on the yield of ammonia at constant temperature.Effect:Explanation:[3][Turn over11831*20GCM2205**20GCM2205*

(c) In the Haber Process the forward reaction is exothermic.N2(g) 3H2(g) 2NH3(g)(i) Explain, in terms of bonds, why this reaction is exothermic.[3]energy(ii) Complete and label the reaction profile diagram for the Haber Process.Include the energy level for the products and the energy change for thereaction.N2 3H2progress of reaction[2]11831*20GCM2206**20GCM2206*

(iii) Use the balanced symbol equation for the Haber Process and the bondenergies given in the table below to calculate the energy change for theforward reaction.BondBond Energy/kJN N916H H436N H386Energy change          kJ [4][Turn over11831*20GCM2207**20GCM2207*

3Alkenes are unsaturated hydrocarbons which are used to make polymers and otherchemicals.(a) (i) State the meaning of the term hydrocarbon.[1](ii) Write the general formula of the alkenes.[1](b) But-1-ene and but-2-ene are alkenes.(i) Draw the structural formulae of but-1-ene and GCM2208*

(ii) Write a balanced symbol equation for the complete combustion ofbut-1-ene.[3](c) Propene, another alkene, may be produced from the cracking of thehydrocarbon C7H16. One other product is formed in this reaction.(i) Write a balanced symbol equation for the cracking of C7H16.[2](ii) Name the other product formed in this reaction.[1](iii) Suggest why high temperatures are required for cracking reactions.[1][Turn over11831*20GCM2209**20GCM2209*

(d) Alkenes can undergo polymerisation to form polymers.(i) State the type of polymerisation which alkenes undergo.[1](ii) An alkene produces the polymer with the repeating unit shown below.H CICCHHName the alkene from which this polymer is formed.[1](iii) Write an equation for the polymerisation of ethene.[3]11831*20GCM2210**20GCM2210*

(e) Identify the functional group present in alkenes and describe a chemical test forthis functional group.Write a balanced symbol equation for the chemical reaction which occurs whenethene is tested in this way.In this question you will be assessed on your written communication skillsincluding the use of specialist terms.[6][Turn over11831*20GCM2211**20GCM2211*

4Calcium nitrate is used as a component in fertilisers and in explosives.(a) Calcium nitrate may be formed from the reaction of nitric acid with calciumhydroxide solution. In a titration 25.0 cm3 portions of calcium hydroxide solutionwere titrated against nitric acid of concentration 0.75 mol/dm3. The average titrewas determined to be 24.0 cm3.The balanced symbol equation for the reaction is:Ca(OH)2 2HNO3 Ca(NO3)2 2H2O(i) Calculate the concentration of the calcium hydroxide solution in mol/dm3.Concentration         mol/dm3 [3](ii) Calculate the concentration of the calcium hydroxide solution in g/dm3.Concentration         g/dm3 [1]11831*20GCM2212**20GCM2212*

(b) Calcium nitrate decomposes on heating according to the following equation:2Ca(NO3)2(s) 2CaO(s) 4NO2(g) O2(g)Calculate the total volume of gas (NO2 and O2), in dm3, produced at 20 C and1 atm pressure when 32.8 kg of calcium nitrate are heated to constant mass.Total volume of gas         dm3 [4][Turn over11831*20GCM2213**20GCM2213*

(c) Nitrogen dioxide gas, NO2, is an air pollutant that causes health problemsespecially in the respiratory system. It forms in the atmosphere when nitrogenmonoxide gas, NO, reacts with oxygen gas according to the following equation:2NO(g) O2(g) 2NO2(g)(i) State Avogadro’s Law.[2](ii) Using Avogadro’s Law, calculate the volume of NO2 produced, in dm3, when160 dm3 of oxygen gas react completely with nitrogen monoxide.Volume of NO2 dm3 [1]11831*20GCM2214**20GCM2214*

BLANK PAGEDO NOT WRITE ON THIS PAGE(Questions continue overleaf)[Turn over11831*20GCM2215**20GCM2215*

5Molten lead(II) bromide undergoes electrolysis.(a) What is meant by the term electrolysis?[1](b) The apparatus below is used to carry out the electrolysis of molten lead(II)bromide.lampbatterypositive electrodenegative electrodecrucible containingmolten lead(II) bromidepipeclaytriangletripodheatheatproof mat Chief Examiner / CCEA(i) Name the material used to make the electrodes in this electrolysis.[1](ii) State two reasons why this material is used to make the electrodes.1.2.[2]11831*20GCM2216**20GCM2216*

(iii) Suggest why this electrolysis experiment needs to be carried out in a fumecupboard.[1](iv) What name is given to the positive electrode?[1](c) Complete the table to give details of the electrolysis of molten lead(II) bromide.Negative electrodeObservations at theelectrodePositive electrodesilvery grey liquid formedName ofelectrolysis productHalf equation forthe reaction at theelectrode[10][Turn over11831*20GCM2217**20GCM2217*

6Oxygen gas may be prepared in the laboratory from the decomposition of hydrogenperoxide solution.(a) (i) Write a balanced symbol equation for the decomposition of hydrogenperoxide.[3](ii) Write the formula of the catalyst used in this reaction.[1](iii) Describe the chemical test for oxygen gas and state the result for a positivetest.[2]11831*20GCM2218**20GCM2218*

(b) Oxygen reacts with both metals and non-metals to form oxides. Complete thefollowing table giving information about the reaction of oxygen gas with theelements magnesium and sulfur.MagnesiumSulfurObservations duringreaction with oxygenAppearance ofproduct after reactionwith oxygenNature of oxideformed (acidic orbasic)[7]THIS IS THE END OF THE QUESTION PAPER11831*20GCM2219**20GCM2219*

DO NOT WRITE ON THIS PAGEFor Examiner’suse onlyQuestionMarksNumber123456TotalMarksExaminer NumberPermission to reproduce all copyright material has been applied for.In some cases, efforts to contact copyright holders may have been unsuccessful and CCEAwill be happy to rectify any omissions of acknowledgement in future if notified.240633*20GCM2220**20GCM2220*

SulfateSulfiteSOLUBILITY IN COLD WATER OF COMMON SALTS,HYDROXIDES AND OXIDESSolubleAll sodium, potassium and ammonium saltsAll nitratesMost chlorides, bromides and iodidesEXCEPT silver and lead chlorides, bromides and iodidesMost sulfates EXCEPT lead and barium sulfatesCalcium sulfate is slightly solubleInsolubleMost carbonatesEXCEPT sodium, potassium and ammonium carbonatesMost hydroxidesEXCEPT sodium, potassium and ammonium hydroxidesMost oxides EXCEPTCCEA 2017 sodium, potassium and calcium oxides which react with waternec Neifi wcatioSpSYMBOLS OF SELECTED IONSNegative ionsPositive rbonateChromium(III)Cr3 DichromateCopper(II)Cu2 EthanoateCH3COO2 Iron(II)FeHydrogencarbonateIron(III)Fe3 HydroxideOH–2 Lead(II)PbMethanoateHCOO–SilverAg NitrateNOZincZn2 PropanoateC2H5COO–Data LeafletIncluding the Periodic Table of the ElementsFor the use of candidates takingScience: Chemistry,Science: Double Awardor Science: Single AwardCopies must be free from notes or additions of anykind. No other type of data booklet or informationsheet is authorised for use in the examinationsgcse examinationschemistry CCEA 2017For first teaching from September 2017

THE PERIODIC TABLE OF 5818283848586878889*†104* 58 – 71 Lanthanum series† 90 – 103 Actinium seriesaxba relative atomic mass(approx)x atomic symbolb atomic 90919293949596979899100101102103112

gcse examinations chemistry. 227 89 139 57 256 101 223 87 226 88 261 104 262 105 266 106 264 107 277 108 268 109 271 110 272 111 140 58 141 59 144 60 145 61 150 62 152 63 157 64 159 65 162 66 165 67 167 68 169 69 173 70 175 71 232 90 231 91 238 92 237 93 242 94 2

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