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GCE MAY 2007 : (A2 1) Further Organic, Physical and Inorganic Chemistry

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Centre Number 71 Candidate Number ADVANCED General Certificate of Education 2007 assessing Module 4: Further Organic, Physical and Inorganic Chemistry A2C11 Chemistry Assessment Unit A2 1 [A2C11] FRIDAY 25 MAY, 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 fifteen 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 five questions in Section B. Write your answers in the spaces provided in this question paper. For Examiner s use only Question Number Marks Section A INFORMATION FOR CANDIDATES The total mark for this paper is 90. Quality of written communication will be assessed in Question 13(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 pages indicate the marks awarded to each question or part question. A Periodic Table of Elements (including some data) is provided. 1 10 Section B 11 12 13 14 15 Total Marks A2C1S7 2901 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 The reaction between propanone and hydrogen cyanide is described as A B C D 2 What is the pH of the buffer formed when 50 cm3 of 0.20 M sodium hydroxide is added to 50 cm3 0.40 M ethanoic acid? (Ka of ethanoic acid = 1.75 10 5 mol dm 3) A B C D 3 2.58 2.73 4.76 11.71 Which one of the following sets of sugars will form a silver mirror with Tollen s reagent? A B C D 4 electrophilic addition. electrophilic substitution. nucleophilic addition. nucleophilic substitution. Fructose, glucose and maltose Fructose, glucose and sucrose Fructose, maltose and sucrose Glucose, maltose and sucrose Given the following standard electrode potentials: Zn2+(aq) + 2e Zn(s) 2+(aq) + 2e Fe Fe(s) I2(aq) + 2e 2I (aq) Fe3+(aq) + e Fe2+(aq) 0.76 V 0.44 V +0.54 V +0.77 V Which one of the following statements is correct? A B C D A2C1S7 Zinc metal is the most powerful oxidising agent. Iron metal will displace iodide ions from solution. Iron(II) ions will reduce iodine to iodide ions. Iodide ions will reduce iron(III) ions to iron(II) ions but not to iron. 2901 2 [Turn over 5 Which one of the following represents the complex formed when thiosulphate ions are used as a fixer in photography? A B C D 6 [Ag(S2O3)2]3 (aq) [Ag2(S2O3)2]2 (aq) [AgS2O3] (aq) Ag2S2O3(s) The table below shows the pH range over which some indicators change colour. pH range of colour change Indicator Salicyl yellow 10.0 12.0 Thymol blue 8.0 9.6 Bromothymol blue 6.0 7.6 Malachite green 0.2 1.8 Which one of the following indicators is suitable to establish the end point when adding 0.1 M HCl to 0.1 M NH3? A B C D 7 The partition coefficient of butanedioic acid between ethoxyethane and water is 5. What mass of butanedioic acid will be extracted when a solution containing 5.00 g of butanedioic acid in 100 cm3 of water is shaken with 10 cm3 of ethoxyethane? A B C D 8 Bromothymol blue Malachite green Salicyl yellow Thymol blue 0.50 g 1.67 g 3.33 g 4.50 g Which one of the following salts dissolves in water to form an acidic solution? A B C D A2C1S7 Ammonium chloride Lithium chloride Potassium hydrogencarbonate Sodium carbonate 2901 3 [Turn over 9 Which one of the following compounds displays optical isomerism? A B C D CH3CHOHCOOH CH2OHCH2COOH CH2OHCOOCH3 CH2OHCH2CHO 10 Which one of the following is a conjugate acid-base pair? Acid A HSO4 HSO4 H3O+ C SO42 HSO4 D 2901 H2SO4 B A2C1S7 Conjugate base HSO4 H2SO4 4 [Turn over Section B Examiner Only Marks Remark Answer all five questions in the spaces provided. 11 Dinitrogen pentoxide (N2O5), when heated, decomposes according to the equation: 2N2O5(g) 2N2O4(g) + O2(g) (a) Giving no practical details, suggest one way by which the rate of this reaction could be measured. ______________________________________________________ [1] (b) The following results were obtained for the reaction at 45 C. [N2O5] mol dm 3 10 3 20.4 18.2 12.5 9.5 4.0 Rate of disappearance of N2O5 10 6 mol dm 3 s 1 11.2 10.0 6.9 5.2 2.2 (i) Plot a graph of these results and deduce the rate equation for the reaction. 12 10 rate of disappearance of N2O5 10 6 (mol dm 3 s 1) 8 6 4 2 0 0 5 10 15 20 25 3 (mol dm 3) [N2O5] 10 __________________________________________________ [2] A2C1S7 2901 5 [Turn over (ii) Calculate the value of the rate constant, stating its units. Examiner Only Marks Remark _____________________________________________________ _____________________________________________________ __________________________________________________ [2] A2C1S7 2901 6 [Turn over 12 The elements of the third period, sodium to chlorine, show a change from metallic to non-metallic character across the period. Examiner Only Marks Remark (a) Complete the table below giving the formula, classification (acidic, basic, amphoteric or neutral) and type of bonding present in each of the oxides of the elements listed. Element Formula of oxide Classification Type of bonding in oxide Aluminium Phosphorus Silicon [3] (b) Aluminium reacts with chlorine to form aluminium chloride, Al2Cl6. (i) Showing the outer electrons only, draw a dot-cross diagram to show the bonding in aluminium chloride. [3] (ii) Write an equation for the reaction of aluminium chloride with water. __________________________________________________ [2] A2C1S7 2901 7 [Turn over (c) Magnesium reacts slowly with cold water, but will burn in steam to form magnesium oxide. Examiner Only Marks Remark (i) Draw a labelled diagram of the apparatus you could use to burn magnesium in steam. [2] (ii) The partially complete Born Haber Cycle for magnesium oxide is shown below. Mg2+(g) + O2 (g) Mg2+(g) + O(g) + 2e 1 Mg2+(g) + O2(g) + 2e 2 B 1 Mg(g) + O2(g) 2 A 1 Mg(s) + O2(g) 2 MgO(s) Name the changes A and B. A ___________________________________________________ B ________________________________________________ [2] A2C1S7 2901 8 [Turn over (iii) Using the data below, calculate the lattice enthalpy for magnesium oxide. A B Bond enthalpy for oxygen 1st & 2nd electron affinity for oxygen Enthalpy of formation of magnesium oxide Examiner Only Marks Remark kJ mol 1 +150 +2186 +596 +650 602 _____________________________________________________ _____________________________________________________ __________________________________________________ [2] A2C1S7 2901 9 [Turn over 13 Pheromones, used as a chemical communication system by insects, were first isolated and identified in 1959. Examiner Only Marks Remark (a) The isomers shown below are pheromones used by two different insects. CH3CH2CH2COCH3 (CH3)2CHCH2CHO A B (i) What is the systematic name for A? __________________________________________________ [1] (ii) Give a chemical test to distinguish between A and B, stating any observations you would make. _____________________________________________________ _____________________________________________________ _____________________________________________________ __________________________________________________ [3] (iii) The cabbage white butterfly can detect as little as 1 10 13 g of B. Calculate how many molecules of B are present in 1 10 13 g. _____________________________________________________ _____________________________________________________ _____________________________________________________ __________________________________________________ [3] A2C1S7 2901 10 [Turn over (b) The european paper wasp uses 3-methylbutanoic acid, (CH3)2CHCH2COOH, as a pheromone. Examiner Only Marks Remark (i) Explain, giving experimental details, how a pure sample of 3-methylbutanoic acid could be prepared from the alcohol, 3-methylbutan-1-ol. _____________________________________________________ _____________________________________________________ _____________________________________________________ _____________________________________________________ _____________________________________________________ _____________________________________________________ _____________________________________________________ __________________________________________________ [4] Quality of written communication [2] (ii) The dissociation constant, Ka, for 3-methylbutanoic acid is 1.5 10 3 mol dm 3. Calculate the pH of a 0.1 M solution of 3-methylbutanoic acid. _____________________________________________________ _____________________________________________________ __________________________________________________ [2] (iii) Give two observations when phosphorus(V) chloride is added to 3-methylbutanoic acid. _____________________________________________________ __________________________________________________ [2] (iv) Write an equation for the reaction in part (iii). __________________________________________________ [2] A2C1S7 2901 11 [Turn over 14 Iron Age man formed soap by boiling animal fat with water and wood ash, which is alkaline. Examiner Only Marks Remark (a) Fats are esters of propan-1,2,3-triol and fatty acids. (i) Draw the structure of the ester tristearin formed from stearic acid and propan-1,2,3-triol. [2] (ii) Write an ionic equation for the reaction of tristearin with hydroxide ions. __________________________________________________ [2] (b) The saponification value of a fat is a measure of the relative molecular masses of the fatty acids present. (i) Define the term saponification value. _____________________________________________________ __________________________________________________ [2] (ii) The following results were obtained when the saponification value for lard was determined. Mass of lard = 1.05 g Volume of 0.1 M KOH added = 50.0 cm3 Volume of 0.1 M HCl needed to neutralise unreacted KOH = 13.3 cm3 Calculate the saponification value for lard. _____________________________________________________ _____________________________________________________ _____________________________________________________ _____________________________________________________ __________________________________________________ [4] A2C1S7 2901 12 [Turn over (c) Olive oil is an unsaturated fat. The degree of unsaturation in a fat is measured using its iodine value. Examiner Only Marks Remark (i) Define the term iodine value. _____________________________________________________ __________________________________________________ [2] (ii) Olive oil may be hardened using nickel as a catalyst. Explain the chemistry of hardening . _____________________________________________________ __________________________________________________ [2] (d) Explain why nutritionists advise that our diet should be low in saturated fats. _________________________________________________________ ______________________________________________________ [1] A2C1S7 2901 13 [Turn over 15 Sulphuric acid was first discovered in the 8th century by the alchemist Jabir ibn Hayyan. Today it is manufactured using the Contact Process. Examiner Only Marks Remark (a) One step in the manufacture is the formation of sulphur trioxide from sulphur dioxide. 2SO2(g) + O2(g) 2SO3(g) (i) State the conditions used for the above reaction. Catalyst: ___________________________ Pressure: ___________________________ Temperature: ___________________________ [3] (ii) Explain why these conditions are used. Catalyst: ______________________________________________ _____________________________________________________ Pressure: _____________________________________________ _____________________________________________________ Temperature: __________________________________________ __________________________________________________ [3] (iii) Write an expression for Kp for the equilibrium. _____________________________________________________ __________________________________________________ [1] A2C1S7 2901 14 [Turn over (iv) In an experiment 2.00 moles of SO2 and 2.00 moles of O2 are mixed and allowed to reach equilibrium at 1100 K and 1.78 108 N m 2. 1.8 moles of SO3 were present at equilibrium. Examiner Only Marks Remark Calculate the value of Kp stating its units. _____________________________________________________ _____________________________________________________ _____________________________________________________ _____________________________________________________ _____________________________________________________ _____________________________________________________ __________________________________________________ [4] (b) Sulphuric acid is used in the manufacture of fertilisers such as superphosphate (Ca(H2PO4)2). (i) Write an equation for the formation of superphosphate. __________________________________________________ [2] (ii) Calculate the percentage of phosphorus in superphosphate. _____________________________________________________ _____________________________________________________ __________________________________________________ [2] (iii) State one advantage and one disadvantage of using artificial fertilisers such as superphosphate. Advantage: ___________________________________________ _____________________________________________________ Disadvantage: _________________________________________ __________________________________________________ [2] THIS IS THE END OF THE QUESTION PAPER A2C1S7 2901 15 [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. S 9/06 7-134-1

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Additional Info : Gce Chemistry May 2007 Assessment Unit A2 1 Module 4: Further Organic, Physical and Inorganic Chemistry
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