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GCE JAN 2008 : (AS 2) Organic, Physical and Inorganic Chemistry

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Centre Number 71 Candidate Number ADVANCED SUBSIDIARY (AS) General Certificate of Education January 2008 Chemistry assessing Module 2: Organic, Physical and Inorganic Chemistry ASC21 Assessment Unit AS 2 [ASC21] TUESDAY 22 JANUARY, MORNING 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 12 INFORMATION FOR CANDIDATES The total mark for this paper is 100. Quality of written communication will be assessed in question 16(b)(iii). 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. ASC2W8 3442 Marks 13 14 15 16 17 Total Marks BLANK PAGE ASC2W8 3442 2 [Turn o Section A For each of the 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 Which one of the following correctly describes the structure of low density (LD) polythene? A B C D 2 Branched and crystalline Branched and non-crystalline Unbranched and non-crystalline Unbranched and crystalline Which one of the following does not represent a propagation step in the reaction between methane and chlorine in the presence of ultraviolet light? CHCl3 + Cl CCl3 + HCl CH3 + Cl CH3Cl CH3 + Cl2 CH3Cl + Cl CH2Cl + Cl2 CH2Cl2 + Cl A B C D 3 Which one of the following lists Group II metal carbonates and hydroxides in order of increasing thermal stability? Metal carbonates Metal hydroxides A Ba(OH)2 Sr(OH)2 Ca(OH)2 Mg(OH)2 B BaCO3 SrCO3 CaCO3 MgCO3 Mg(OH)2 Ca(OH)2 Sr(OH)2 Ba(OH)2 C MgCO3 CaCO3 SrCO3 BaCO3 Mg(OH)2 Ca(OH)2 Sr(OH)2 Ba(OH)2 D ASC2W8 MgCO3 CaCO3 SrCO3 BaCO3 BaCO3 SrCO3 CaCO3 MgCO3 Ba(OH)2 Sr(OH)2 Ca(OH)2 Mg(OH)2 3442 3 [Turn over 4 20 cm3 of a gaseous hydrocarbon reacts with exactly 90 cm3 of oxygen producing 60 cm3 of carbon dioxide (measured at the same temperature and pressure). Which one of the following is the formula of the hydrocarbon? A B C D 5 Which one of the following can be used to produce methyl ethanoate? A B C D 6 Ethanoyl chloride and methanoic acid Ethanoyl chloride and methanol Methane and ethanoic acid Methanoic acid and ethanol Which one of the following lists the fractions from crude oil in order of decreasing boiling point? A B C D 7 C3H6 C3H8 C6H12 C6H14 diesel, kerosene, naphtha, gasoline gasoline, kerosene, naphtha, diesel gasoline, naphtha, kerosene, diesel kerosene, diesel, naphtha, gasoline Ethene contains A B C D ASC2W8 4 sigma ( ) bonds and 2 pi ( ) bonds. 5 sigma ( ) bonds and 1 pi ( ) bond. 2 sigma ( ) bonds and 4 pi ( ) bonds. 1 sigma ( ) bond and 5 pi ( ) bonds. 3442 4 [Turn o 8 3.70 g of butan-1-ol (RMM = 74) was used to prepare 1-bromobutane (RMM = 137) and a 60% yield was achieved. Which one of the following statements is correct? A B C D The actual yield is 4.11 g. The actual yield is 6.85 g. The theoretical yield is 2.00 g. The theoretical yield is 2.22 g 9 Which one of the following describes the conditions used in the Haber Bosch process? Pressure Temperature Catalyst A 400 500 atm 200 300 C Iron B 200 300 atm 400 500 C Vanadium(V) Oxide C 1 2 atm 400 500 C Vanadium(V) Oxide D 200 300 atm 400 500 C Iron 10 A hydrocarbon contains 85.7% carbon (by mass) and has a relative molecular mass greater than 50 but less than 60. Which one of the following statements is correct? A B C D ASC2W8 The empirical formula is C2H4. The empirical formula is C2H5. The molecular formula is C4H8. The molecular formula is C4H10. 3442 5 [Turn over Section B Examiner Only Marks Remark Answer all seven questions in the spaces provided. 11 But-2-ene exhibits geometric (cis-trans) isomerism. (a) Draw the cis and trans isomers of but-2-ene cis trans [2] (b) Explain why but-2-ene exhibits geometric isomerism. _________________________________________________________ ______________________________________________________ [2] ASC2W8 3442 6 [Turn over 12 Halogenoalkanes react with aqueous and alcoholic solutions of sodium hydroxide. Examiner Only Marks Remark (a) Which one of the following halogenoalkanes would you expect to react most readily with aqueous sodium hydroxide? 1-chlorobutane 1-bromobutane 1-iodobutane ______________________________________________________ [1] (b) Explain why the halogenoalkane you have chosen in part (a) reacts more readily than the other two. _________________________________________________________ _________________________________________________________ _________________________________________________________ ______________________________________________________ [2] (c) Draw the structure of the organic product obtained when 1-bromo2-methylbutane is heated with (i) aqueous sodium hydroxide [1] (ii) alcoholic sodium hydroxide [1] ASC2W8 3442 7 [Turn over 13 Methanol can be formed from carbon dioxide and hydrogen in a reversible reaction: CO2 (g) + 3H2 (g) Examiner Only Marks Remark CH3OH (g) + H2O (g) A position of dynamic equilibrium is established if conditions are kept constant. (a) (i) What do you understand by the term dynamic equilibrium? ______________________________________________________ ______________________________________________________ ___________________________________________________ [2] (ii) State and explain the effect of increasing the pressure on the position of the above equilibrium if the temperature remains constant. ______________________________________________________ ______________________________________________________ ___________________________________________________ [2] (iii) If the temperature is increased, the equilibrium yield of methanol decreases. Deduce the sign of the enthalpy change for the forward reaction and explain your reasoning. ______________________________________________________ ______________________________________________________ ___________________________________________________ [2] (b) Why would the equilibrium position remain unchanged if a catalyst was added? _________________________________________________________ ______________________________________________________ [1] ASC2W8 3442 8 [Turn over 14 Alkenes, such as ethene, are more reactive than the corresponding alkanes. Examiner Only Marks Remark (a) Ethene reacts with hydrogen bromide. (i) Draw a flow scheme to illustrate the mechanism of this reaction. [3] (ii) Name the mechanism for this reaction. ___________________________________________________ [2] (b) Calculate the volume of pure liquid bromine which would be required to react completely with 120 cm3 of gaseous ethene (measured at 20 C and 1 atmosphere pressure). C2H4 + Br2 C2H4Br2 Number of moles of ethene _________________________________________________________ Number of moles of bromine (Br2) _________________________________________________________ Number of grams of bromine (Br2) _________________________________________________________ Volume of pure liquid bromine (density = 3.2 g cm 3) ______________________________________________________ [4] ASC2W8 3442 9 [Turn over 15 Magnesium is a reactive metal which can form many compounds. Examiner Only Marks Remark (a) Magnesium burns when heated in air. (i) Give one observation when this reaction is carried out in the laboratory. ___________________________________________________ [1] (ii) Write an equation for this reaction. ___________________________________________________ [2] (b) Magnesium also reacts with dilute hydrochloric acid forming a solution of magnesium chloride. Mg (s) + 2HCl (aq) MgCl2 (aq) + H2 (g) Calculate the volume of hydrogen gas produced (measured at 20 C and 1 atmosphere pressure) if an excess of magnesium is added to 50.0 cm3 of 2M hydrochloric acid. _________________________________________________________ _________________________________________________________ _________________________________________________________ ______________________________________________________ [3] (c) (i) What is observed when solutions of magnesium chloride and sodium carbonate are mixed? ___________________________________________________ [2] (ii) Write an ionic equation, including state symbols, to represent the above reaction. ___________________________________________________ [2] ASC2W8 3442 10 [Turn over (d) (i) State and explain the trend in the solubilities of the Group II sulphates as the Group is descended. Examiner Only Marks Remark ______________________________________________________ ______________________________________________________ ______________________________________________________ ______________________________________________________ ___________________________________________________ [4] (ii) Name a reagent which can be used to test for the presence of sulphate and sulphite ions in solution. ___________________________________________________ [1] ASC2W8 3442 11 [Turn over 16 There are four isomeric alcohols with the formula C4H9OH. Examiner Only Marks Remark (a) Complete the following table, giving the missing structures, name and classifications. (P = Primary, S = Secondary and T = Tertiary) Structure and Name Classification HHHH H C C C C OH P HHHH butan-1-ol H OH H HCC CH H CH3 H 2-methylpropan-2-ol 2-methylpropan-1-ol [6] ASC2W8 3442 12 [Turn over (b) (i) Explain the term structural isomers. Examiner Only Marks Remark ______________________________________________________ ___________________________________________________ [2] (ii) What is a tertiary alcohol? ______________________________________________________ ___________________________________________________ [2] (iii) Describe a chemical test which could be used to distinguish between 2-methylpropan-2-ol and butan-1-ol. ______________________________________________________ ______________________________________________________ ______________________________________________________ ______________________________________________________ ___________________________________________________ [3] Quality of written communication [2] (c) (i) What structural feature must an alcohol contain to give a positive iodoform test? ___________________________________________________ [1] (ii) Name or give the structure of the alcohol from part (a) which gives a positive iodoform test. ___________________________________________________ [1] (iii) Describe how you can carry out the iodoform test, stating the result for a positive test. ______________________________________________________ ______________________________________________________ ___________________________________________________ [3] ASC2W8 3442 13 [Turn over 17 Carbon monoxide (CO) and nitrogen monoxide (NO) are produced when fuels are burned in car engines, but are then removed in the catalytic converter. Examiner Only Marks Remark (a) A catalytic converter consists of metals spread very thinly on a ceramic support (the honeycomb ). When a catalytic converter is fitted to the exhaust of a car, CO and NO combine to form less harmful products. (i) Name the less harmful products. _____________________________________________________ __________________________________________________ [2] (ii) Give the equation for the reaction between CO and NO. __________________________________________________ [1] (iii) Name one metal used in a catalytic converter. __________________________________________________ [1] (iv) Suggest two reasons why the metals are spread very thinly on a ceramic support (honeycomb). _____________________________________________________ __________________________________________________ [2] (v) Why are the reactions occurring in a catalytic converter described as heterogeneous catalysis? _____________________________________________________ __________________________________________________ [2] (vi) Explain, using chemisorption, how the catalyst works. _____________________________________________________ __________________________________________________ [2] (vii) Explain why leaded petrol should not be used in a car that has a catalytic converter fitted in the exhaust pipe. _____________________________________________________ __________________________________________________ [2] ASC2W8 3442 14 [Turn over (b) The diagram below shows the distribution of molecular kinetic energies in a mixture of CO and NO at temperature T1. Examiner Only Marks Remark T1 EA Kinetic energy (i) Label the y axis on the above diagram. [1] (ii) The activation energy (EA) is indicated on the diagram. Explain the term activation energy. ______________________________________________________ ___________________________________________________ [1] (iii) Why do most collisions between molecules of CO and NO, at temperature T1, not result in a reaction? ______________________________________________________ ___________________________________________________ [1] (iv) On the diagram above, draw a curve to show the distribution of molecular kinetic energies at a higher temperature and label it T2. [3] (v) Using the distribution curves, explain why the reaction between molecules of CO and NO is faster at the higher temperature T2. ______________________________________________________ ___________________________________________________ [2] THIS IS THE END OF THE QUESTION PAPER ASC2W8 3442 15 [Turn over S 3/07 302-024-1

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Additional Info : Gce Chemistry January 2008 Assessment Unit AS 2Module 2: Organic, Physical and Inorganic Chemistry
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