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GCE JUN 2010 : (AS 2) Organic, Physical and Inorganic Chemistry - Revised

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Sp N ec e i w ca tio n Centre Number 71 Candidate Number ADVANCED SUBSIDIARY (AS) General Certificate of Education 2010 Chemistry Assessment Unit AS 2 Module 2: Organic, Physical and Inorganic Chemistry AC121 assessing [AC121] THURSDAY 17 JUNE, AFTERNOON TIME 1 hour 30 minutes. INSTRUCTIONS TO CANDIDATES Write your Centre Number and Candidate Number in the spaces provided at the top of this page. Answer all seventeen questions. Answer all ten questions in Section A. Record your answers by marking the appropriate letter on the answer sheet provided. Use only the spaces numbered 1 to 10. Keep in sequence when answering. Answer all seven questions in Section B. Write your answers in the spaces provided in this question paper. For Examiner s use only Question Number Section A 1 10 Section B 11 INFORMATION FOR CANDIDATES The total mark for this paper is 100. Quality of written communication will be assessed in question 16(b)(i). In Section A all questions carry equal marks, i.e. two marks for each question. In Section B the figures in brackets printed down the right-hand side of the pages indicate the marks awarded to each question or part question. A Periodic Table of Elements (including some data) is provided. 6566.02 R Marks 12 13 14 15 16 17 Total Marks Section A For each of the following questions only one of the lettered responses (A D) is correct. Select the correct response in each case and mark its code letter by connecting the dots as illustrated on the answer sheet. 1 The correct name for the compound with the following structure CH3 H CH3 C C C C CH3 H H H H H H is A B C D 2 1,1,4-trimethylbutane. 1,4-dimethylpentane. 1,4,4-trimethylbutane. 2-methylhexane. A mixture of two salts (X and Y) produced the following results. Test Observation Flame test Yellow/orange colour Addition of HNO3(aq) No effervescence Addition of AgNO3(aq) Yellow precipitate Addition of BaCl2(aq) White precipitate X and Y could be A B C D 6566.02 R potassium iodide and potassium carbonate sodium chloride and sodium carbonate sodium chloride and sodium sulphate sodium iodide and sodium sulphate 2 [Turn over 3 When heated with acidified potassium dichromate solution, which one of the following alcohols does not cause the solution to change from orange to green? A B C D 4 0.05 moles of a liquid fuel was used to increase the temperature of 200 g of water by 10 K. The heat capacity of water is 4.2 J g 1 K 1 . What is the molar enthalpy of combustion of the fuel? A B C D 5 8.4 kJ mol 1 168 kJ mol 1 420 kJ mol 1 8400 kJ mol 1 The reaction between bromoethane and ethanolic potassium hydroxide is described as A B C D 6 butan-1-ol butan-2-ol 2-methylpropan-1-ol 2-methylpropan-2-ol electrophilic addition elimination free radical substitution nucleophilic substitution Which one of the following lists both sets of compounds in order of increasing solubility (least soluble rst, most soluble last)? Sulphates Hydroxides A Ba(OH)2, Sr(OH)2, Ca(OH)2, Mg(OH)2 B MgSO4, CaSO4, SrSO4, BaSO4 Mg(OH)2, Ca(OH)2, Sr(OH)2, Ba(OH)2 C BaSO4, SrSO4, CaSO4, MgSO4 Mg(OH)2, Ca(OH)2, Sr(OH)2, Ba(OH)2 D 6566.02 R MgSO4, CaSO4, SrSO4, BaSO4 BaSO4, SrSO4, CaSO4, MgSO4 Ba(OH)2, Sr(OH)2, Ca(OH)2, Mg(OH)2 3 [Turn over 7 Which one of the following alcohols gives a positive iodoform test? A B C D 8 Which one of the following hydrocarbons has the empirical formula C3H5? A B C D 9 butan-1-ol butan-2-ol 2-methylpropan-1-ol 2-methylpropan-2-ol CH3CH CH2 CH3(CH2)3CH CH2 (CH3)3CCH2CH2CH3 CH2 CHCH2CH2CH CH2 Which one of the following substances is not formed when methane reacts with chlorine in the presence of ultraviolet light? A B C D dichloromethane ethane hydrogen hydrogen chloride 10 An aqueous solution produced a precipitate on addition of a few drops of aqueous sodium hydroxide. The precipitate dissolved on addition of excess sodium hydroxide but not on addition of excess ammonia. The solution contains A B C D 6566.02 R Al3+(aq). Fe3+(aq). Mg2+(aq). Zn2+(aq). 4 [Turn over Section B Examiner Only Marks Remark Answer all seven questions in the spaces provided. 11 Analysis of a compound, which contains carbon, hydrogen and bromine only, showed that 22.2% of its mass is carbon and 3.7% is hydrogen. The relative molecular mass of the compound is 216. Calculate the molecular formula of the compound. __________________________________________________________ __________________________________________________________ __________________________________________________________ __________________________________________________________ ________________________________________________________ [3] 6566.02 R 5 [Turn over 12 Consider the following sequence of reactions: Examiner Only Marks H H H H C C Br HH bromoethane C H H C Remark H HO HH H CC HH ethanol O H ethanoic acid HC C H O H C C H H HH ethyl ethanoate (a) (i) Name the mechanism for the conversion of ethene to bromoethane. _________________________________________________ [2] (ii) Draw a flow scheme to represent the mechanism for the conversion of ethene to bromoethane. [3] (b) (i) Name the type of reaction which occurs when ethanoic acid and ethanol react to form ethyl ethanoate. _________________________________________________ [1] (ii) Name another reagent which reacts with ethanol to form ethyl ethanoate. _________________________________________________ [1] 6566.02 R 6 [Turn over (iii) Part of three infra-red spectra A, B and C are given below. The spectra are those of ethanol, ethanoic acid and ethyl ethanoate but not necessarily in that order. Examiner Only Marks Remark O H bonds produce deep, broad absorptions between 2500 3500 cm 1. C O bonds produce deep, sharp absorptions between 1650 1750 cm 1. Identify each compound from its spectrum. % transmittance A 4000 3000 2000 wavenumber/cm 1 ___________________________ 3000 2000 wavenumber/cm 1 ___________________________ 3000 2000 wavenumber/cm 1 ___________________________ % transmittance B 4000 % transmittance C 4000 [2] 6566.02 R 7 [Turn over 13 Fractional distillation of crude oil is used to produce hydrocarbon fuels. The diesel fraction contains heptadecane molecules which have the formula C17H36. Incomplete combustion of diesel produces carbon monoxide. Examiner Only Marks Remark (a) (i) Write an equation for the incomplete combustion of heptadecane to form carbon monoxide. _________________________________________________ [2] (ii) What is fitted to the exhaust system of a car to change carbon monoxide into carbon dioxide? _________________________________________________ [1] (b) Thermal cracking of long chain hydrocarbons produces shorter chain hydrocarbons. Write an equation for the thermal cracking of heptadecane in which ethene and propene are produced in a 2:1 ratio with only one other product. _____________________________________________________ [2] (c) Ethene and propene can be converted into polythene and polypropene respectively. (i) Name the type of reaction involved in the conversion of propene to polypropene. _________________________________________________ [2] (ii) Suggest the equation for the conversion of styrene to polystyrene: H n C C HH styrene [1] 6566.02 R 8 [Turn over (d) Ethene and propene do not exhibit geometric isomerism. Examiner Only Marks Remark (i) Draw the structure and give the name of a branched alkene, with molecular formula C6H12, which exhibits geometric isomerism. _________________________________________________ [2] (ii) Draw the structures of the geometric isomers for the molecule identified in d(i). [2] 6566.02 R 9 [Turn over 14 Many enthalpy changes, including enthalpies of combustion, can be determined by experiment. Others can be deduced using Hess s Law. Examiner Only Marks Remark (a) (i) State Hess s Law. ___________________________________________________ _________________________________________________ [2] (ii) Define the term standard enthalpy of combustion. ___________________________________________________ ___________________________________________________ _________________________________________________ [2] (iii) Use the standard enthalpies of formation given in the table below to calculate the enthalpy change for the complete combustion of methane: CH4 + 2O2 CO2 + 2H2O Compound Hf /kJ mol 1 CO2 394 H 2O 286 CH4 75 ___________________________________________________ ___________________________________________________ _________________________________________________ [2] 6566.02 R 10 [Turn over (b) Enthalpy changes can also be calculated using average bond enthalpies. When bond enthalpies were used to estimate the enthalpy of reaction for the complete combustion of methane, it was found to have a value of 698 kJ mol 1. Examiner Only Marks Remark (i) Complete the enthalpy level diagram for this reaction. enthalpy extent of reaction [1] (ii) What is meant by the term average bond enthalpy? ___________________________________________________ _________________________________________________ [2] (iii) Using the estimated enthalpy of reaction and the bond enthalpies given in the table below, calculate the bond enthalpy of the C H bond in methane. bond bond enthalpy/kJ mol 1 CO 743 OO 496 OH 463 ___________________________________________________ ___________________________________________________ ___________________________________________________ _________________________________________________ [3] 6566.02 R 11 [Turn over 15 The second stage in the production of nitric acid involves the reaction of nitrogen monoxide with oxygen to form nitrogen dioxide. When nitrogen monoxide and oxygen are mixed under suitable conditions a dynamic equilibrium is established. 2NO(g) + O2(g) 2NO2(g) Examiner Only Marks Remark H = 116 kJ mol 1 (a) Explain what is meant by the term dynamic equilibrium. ________________________________________________________ _____________________________________________________ [2] (b) State and explain how increasing the pressure will affect the equilibrium yield of nitrogen dioxide. ________________________________________________________ ________________________________________________________ ________________________________________________________ _____________________________________________________ [2] (c) State and explain how increasing the temperature will affect the equilibrium yield of nitrogen dioxide. ________________________________________________________ ________________________________________________________ ________________________________________________________ _____________________________________________________ [2] (d) State and explain the effect a catalyst has on the equilibrium yield of nitrogen dioxide. ________________________________________________________ ________________________________________________________ _____________________________________________________ [2] 6566.02 R 12 [Turn over (e) The first stage in the production of nitric acid involves ammonia. Examiner Only Marks Remark (i) State the temperature and pressure used in the production of ammonia by the Haber process. ____________________________________________________ _________________________________________________ [2] (ii) Why is the temperature used in the Haber process described as a compromise temperature? ____________________________________________________ _________________________________________________ [1] 6566.02 R 13 [Turn over 16 There are four bromoalkanes with the formula C4H9Br. Examiner Only Marks Remark (a) Complete the following table by drawing the missing structures, giving the missing name and indicating the classification for each. (P = Primary, S = Secondary and T = Tertiary) Structure and Name H H H C C C C H H H H H Classification H Br P 1-bromobutane H H C C C H H Br CH3 H H 2-bromo-2-methylpropane 1-bromo-2-methylpropane ___________________________ [6] 6566.02 R 14 [Turn over (b) (i) 1-bromobutane can be prepared by refluxing a mixture containing butan-1-ol, water, sodium bromide and concentrated sulphuric acid for 45 minutes. Describe the remaining steps required to produce a pure, dry sample of this haloalkane. Examiner Only Marks Remark ___________________________________________________ ___________________________________________________ ___________________________________________________ ___________________________________________________ ___________________________________________________ ___________________________________________________ ___________________________________________________ _________________________________________________ [4] Quality of written communication [2] (ii) 11.1 g of butan-1-ol was used to prepare 1-bromobutane and 12.3 g was obtained. C4H9OH + HBr C4H9Br + H2O Calculate the percentage yield. ___________________________________________________ ___________________________________________________ _________________________________________________ [3] (c) When heated with aqueous sodium hydroxide 1-bromobutane was converted into butan-1-ol. How could the resulting solution be tested to prove that it contains bromide ions? _______________________________________________________ _____________________________________________________ [2] 6566.02 R 15 [Turn over 17 The Maxwell-Boltzmann distribution for a mixture of SO2 and O2 which react to form SO3 at 450 K is shown below. 0 0 Examiner Only Marks Remark Ea (a) (i) Label the axes on the above diagram. [2] (ii) Suggest why the curve starts at the origin. ___________________________________________________ _________________________________________________ [1] (iii) Draw a second curve, on the same axes, for the same mixture of gases at 440 K. [2] (iv) By making reference to the two curves, state and explain the effect of reducing the temperature on the rate of reaction. ___________________________________________________ ___________________________________________________ ___________________________________________________ _________________________________________________ [2] 6566.02 R 16 [Turn over (b) Catalysts are used in many industrial processes. Name the catalyst used in each of the following processes. Examiner Only Marks Remark (i) the Contact process __________________________________________________ [1] (ii) the conversion of sunflower oil to margarine __________________________________________________ [1] (iii) the Haber process __________________________________________________ [1] (iv) the reaction of steam with ethene __________________________________________________ [1] (c) Manganese(IV) oxide catalyses the decomposition of hydrogen peroxide solutions: 2H2O2 2H2O + O2 (i) Explain, in terms of activation energy and reaction pathway, how a catalyst works. ____________________________________________________ ____________________________________________________ __________________________________________________[2] (ii) Calculate the volume of oxygen gas (measured at 20 C and 1 atmosphere of pressure) which would be produced when a 50.0 cm3 sample of 2 mol dm 3 hydrogen peroxide solution undergoes complete decomposition. ____________________________________________________ ____________________________________________________ ____________________________________________________ __________________________________________________[3] 6566.02 R 17 [Turn over THIS IS THE END OF THE QUESTION PAPER 6566.02 R 18 [Turn over Permission to reproduce all copyright material has been applied for. In some cases, efforts to contact copyright holders may have been unsuccessful and CCEA will be happy to rectify any omissions of acknowledgement in future if notified. 935-063-1 6566.02 R

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Additional Info : Gce Chemistry June 2010 Assessment Unit AS 2Module 2: Organic, Physical and Inorganic Chemistry - Revised
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