Our country, our future 525/1 S6 CHEMISTRY PAPER 1 DURATION: 2 HOUR 45 MINUTES
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1 1 Our country, our future 525/1 S6 CHEMISTRY Exam 3 PAPER 1 DURATION: 2 HOUR 45 MINUTES For Marking guide contact and consultations: Dr. Bbosa Science INSTRUCTIONS Attempt all questions in Section A and only six in Section B. SECTION A 1. (a) Explain why an azeotrope is a mixture and not a compound.. (b) Name three methods for separating azeotropic mixtures..
2 2 (b) Naphthalene (C10H8) distils in steam at C under a pressure of 753mmHg. The vapor pressure of water at this temperature is 715mmHg. Calculate the percentage by mass of Naphthalene in the distillate (a) complete the following equations and name the major product. + CH 3 CH=CH 2 HCl AlCl 3 Name of the product... CHO PCl 5 Name of the product... (b) Write the mechanism for the reaction in a (a) State three properties of beta particles.
3 3.. (b) Complete the following nuclear transformations (ii) Pu + 0 n 34Se + 60Nd He Cm 96 2 (iii) U + 0 n La n (c) Francium isotope ( ) emits beta particles. the rate of emission reduces from 14.0 to 7.5 counter Fr 87 in 80 second. Calculate the half life of isotopes (a) Draw the structures and name the shapes of the following species Species Structure shape HCO3 - NO2 - SO3 2- (b) Explain why the nitrite ion (NO2 - ) adopts the shape you have named in (a)
4 Name the reagent(s) that can be used to distinguish between the following compounds. In each case state what would be observed when each compound is separately treated with the reagent. CH 3 CH 2 Cl (a) and Cl Reagents Observations(s) (b) CH 3COCH 3 and CH 3CH 2CHO Reagents Observations(s) 6. The graph below was obtained when nitric acid was gradually added to 50cm 3 of 0.72M potassium hydroxide in a calorimeter of negligible heat capacity
5 Temp / 0 C o Vol. HNO 3 (cm 3 ) (a) Determine the volume of nitric acid required to neutralize potassium hydroxide? (b) Calculate Molarity of nitric acid
6 6 (ii) Heat of neutralization of nitric acid by potassium hydroxide (Density of solution = 1.0gcm 3 ) 7. (a) A synthetic rubber, Z, was made from (n) monomers with structure CH 2 =C-CH=CH 2 Cl State the condition for the reaction (ii) Write the equation leading the formation of Z. (b) Name the type reaction in a.
7 7 (c) A solution containing 5.0g of Z in 200cm 3 of benzene is found to have an osmotic pressure of 34kPa at 17 0 C. Calculate the: Molar mass of Z.. (ii) Number of moles of monomers 8. (a) State Raoult s law of relative lowering of vapour pressure.. (b) Calculate the vapour pressure of a solution containing 18g of glucose (C 6H 12O 6) in 50g of water at 60 0 C. (vapour pressure of water at 60 0 C is 150mmHg.)
8 8... (ii) State any assumptions made in (b). 9. (a) State three properties in which boron resembles silicon (1 ½ mark)... (b) Write equation(s) for the reaction of the chloride of boron and silicon with water (3marks).
9 9 SECTION B Attempt any six questions from this section 10. Bauxite is the principal ore used for the extraction of aluminium. (a) Write the formula of bauxite. ( ½ mark) Name two impurities in bauxite (1mark) (b) Briefly explain how pure aluminium can be obtained from bauxite. (Include appropriate equations where necessary) (3marks)
10 10... Sodium carbonate solution was added to an aqueous solution of aluminium chloride State what was observed (1mark) (ii) Write equation of the reaction that took place (1 ½ mark). 11. (a) State three reasons why fluorine differs in some of its properties from the rest of group (VII) elements. (3marks)... (b) Write equation for ionization of hydrogen fluoride in aqueous solution that are Dilute (1 ½ marks)
11 11. (ii) Concentrated (1 ½ marks). (c) Explain why hydrogen fluoride is a weaker acid than hydrogen chloride (3marks) (a) State three characteristics of a chemical equilibrium.. (b) Hyddrogen and iodine react according to the following equations H 2(g) +I 2(g) 2HI(aq) Write the expression for the equilibrium constant Kc.. (c) 0.5 molar quantities of hydrogen and iodine were sealed in a glass bulb at445 0 C until equilibrium was reached. The glass bulb was then rapidly cooled and broken under alkali.
12 12 Explain why the glass bulb was rapidly cooled and broken under alkalis.. The equilibrium mixture was found to contain 0.78moles of hydrogen iodide. Calculate the value of the equilibrium constant, Kc for the reaction at C... (d) State what would happen to the position of equilibrium of the reaction in (b) when Sodium thiosulphate solution is added to the equilibrium mixture.. (ii) Argon gas is added at constant volume (a) A compound Z contain 19.1% nitrogen, 43.6% oxygen and rest manganese. Calculate the empirical formula of Z (ii) 10g of Z in 1000g of water lowered the freezing point by C. Calculate the molecular formula of Z. (kf for water is Cmol -1 kg -1 ).
13 (b) When Z was strongly heated brown fumes were given off. Z dissolved in water to form a pink solution which decolorizes acidified potassium permanganate (VII). Identify Z... (c) State what would be observed and write equation(s) for the reaction(s) that took place in the reaction in (b) when: Concentrated nitric acid and lead (IV) oxide was added and the mixture boiled. Observation.. Equation.. (ii) Sodium carbonate solution was added
14 14 Observation.. (iii) Equation Complete the following equations and in each case write acceptable mechanism of the reaction. (3marks each) (a) CH 3 CH 2 CHO + NaHSO 3 H + (b) Br CH 3 CH 2 O - heat (c) Identify condition and reagent A and product B in the following equation A CH 3 C CH CH 3 C CCu (CH 3 ) 2 CHCl B
15 Reagent A Product B Show how the following conversions can be attained. In each case indicate the reagent and conditions for the reaction. (3marks each) (a) OH CH(CH 3 ) 2 from (b) CH 2 CH 3 Br from (c) (CH 3 ) 2 CO from CH 3 CH 2 OH
16 (a) The solubility of lead (II) iodide is 0.122g in 100cm 3 of water at 40 0 C. Write equation for the solubility of lead (II) iodide in water... (ii) Write expression for the solubility product of lead (II) iodide... (iii) Calculate the solubility product of lead (II) iodide (c) 50cm 3 of 0.001M lead (II) nitrate was mixed with 50cm 3 of 0.001M potassium iodide. Deduce whether lead (II) iodide will be precipitated or not. Show your working.....
17 (a) State factors that can affect standard electrode potential of an element..... (b) The standard electrode potential M 2+ (aq)/m(s) for group II elements are given in the table below: Element Be Mg Ca Sr Ba S.E.P M 2+ (aq)/m(s) State and explain the trend in the variation of standard electrode potential.. (ii) Explain why the values of standard electrode potentials are negative.
18 18.. (c) Electrode potential for some cells are given below Half cell E 0 /V 2-2- Pt(s)/SO 4, SO Cu 2+ (aq), Cu(s) Write the equation of reaction that takes place at the Anode. Cathode Overall equation.. (ii) Calculate the emf of the cell... (iii) State whether the reaction in (a)(ii) above is feasible or not. Give a reason for your answer... END
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