SRJC H1 CHEM P1

1 SERANGOON JUNIOR COLLEGE General Certificate of Education Advanced Level Higher 1 CHEMISTRY 8872/01 PRELIMINARY EXAMINATION 28 August 2009 Paper 1 50 min Additional Materials: Data Booklet Multiple Choice Answer Sheet READ T HESE INSTRUCTIONS FIRST Write your name, index number on the OMS Sheet in the spaces provided. Write in soft pencil. There are thirty questions in this paper. Answer all questions. For each question, there are four possible answers labelled A, B, C and D. Choose the one you consider correct and record your choice in soft pencil on the OMR answer sheet. Read very carefully the instructions on the OMR answer sheet. You are advised to fill in the OMR Answer Sheet as you go along; no additional time will be given for the transfer of answers once the examination has ended. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this question paper. This document consists of 14 printed pages and 0 blank page. SRJC 2009 8872/01/PRELIM/2009 [Turn Over

2 Answer ALL Questions 1 0.5 g of zinc powder was found to reduc e an acidified solution of 25.50 cm 3 of 0.200 mol dm-3 VO2 +. Which one of the following is the reduced product of VO2 +? A VO3 - B VO2+ C V3+ D V2+ 2 3.920 g of an oxide of formula MO was completely dissolved in 30.0 cm 3 of 2.00 mol dm -3 sulphuric acid. The resulting solution was made up to 100 cm 3. 25.0 cm 3 of this solution wa s neutralised by 27.5 cm 3 of 0.100 mol dm-3 sodium hydroxide. What is the relative molecular mass of M? A 48.6 B 54.9 C 55.9 D 101.0 3 One of the isotopes of carbon is carbon-14. Carbon-14 is radioactive and is used in carbon dating by archaeologists. Which one of the following species has the same number of neutrons and electrons as an atom of carbon-14? A 13C B 14N+ C 16O2+ D 17F+ 4 The electronic configurations of two atoms, E and F , are 1s 22s22p3 and 1s 22s22p4 respectively. Compare the first and second ionisation energies of E and F. 1st I.E. 2nd I.E. A E < F E > F B E < F E < F C E > F E > F D E > F E < F SRJC 2009 8872/01/PRELIM/2009 [Turn Over

3 5 Polyurethane is used in coatings, insulators and adhesiv es. Polyurethane What are the values of the bond angles marked x and y in polyurethane? x y A 90 90 B 120 120 C 107 120 D 109.5 90 C O N H CC H H H H N H C O OCC H H H H SRJC 2009 8872/01/PRELIM/2009 [Turn Over 6 Oxygen reacts with nitrogen monoxide in the equation shown. O2 (g) + 2 NO (g)  2 NO2 (g) In an experiment to investigate the effe cts of concentrations on the rate of the reaction, the following results were obtained. Expt [O 2] / mol dm−3 [NO] / mol dm−3 Rate / mol dm−3 s−1 1 1.0 1.0 0.0007 2 1.0 2.0 0.0028 3 2.0 1.0 0.0014 4 2.0 2.0 z The value of z is A 0.0007 B 0.0021 C 0.0056 D 0.0112 O y x n

4 7 What can be deduced from the following equilibrium? 2 SO2 (g) + O2 (g) 2 SO3 (g) H = 98 kJ mol-1 A Adding a catalyst increase the yield of SO3 (g). B Decreasing the pressure will cause the pos ition of equilibrium to shift to the right. C Decreasing the temperature will cause the pos ition of equilibrium to shift to the left. D The maximum mass of SO3(g) that can be made from 64 g of SO2(g) is 80 g 8 The system containing G, J and GJ3 is allowed to reach equilibrium in a 5 dm 3 vessel at a temperature of 1000K. G (g) + 3 J (g) GJ 3 (g) The diagram below shows the c hange in number of moles of G, J and GJ 3 with time. What is the equilibrium constant Kc for the reaction? A 3 0.5 0.1 (0.2) B 3 0.5 0.2 (0.2) C 3 3 0.5 5 0.1 (0.2)   D 3 3 0.5 5 0.2 (0.2)   Amount G J GJ3 Time SRJC 2009 8872/01/PRELIM/2009 [Turn Over

5 9 An enzym e was found to operate at maximum efficiency in an aqueous solution buffered at pH 5. Which of the following would give the nece ssary buffer solution when dissolved in 10 dm3 of water? A 1 mol of NaOH and 1 mol of CH3COOH B 1 mol of CH3COOH and 1 mol of CH3COO–Na+ C 1 mol of HCl and 1 mol of CH3COO–Na+ D 1 mol of CH3COO–NH4 + 10 The following shows the variation of a property of the first 20 elements in the Periodic Table with the proton number of the element. What is the property? A Atomic Radius B First ionisation energy C Ionic radius D Melting point Proton Number  Property SRJC 2009 8872/01/PRELIM/2009 [Turn Over

6 11 Which of the following elements has an oxide with a giant molecular structure and a chloride which is readily hydrolysed? A Silicon B Sodium C Phosphorus D Barium 12 A certain reversible reaction, K + L P + Q, gives the following energy profile diagram. Which of the following statements is false? A E a1 = Ea2 - ∆H B The formation of K and L is an exothermic reaction. C Temperature of surrounding decreases during the formation of P and Q. D The activation energy of the backward r eaction is lower than the activation energy of the forward reaction. K + L P + Q   Ea1 Ea2 Energy     Progress of Reaction SRJC 2009 8872/01/PRELIM/2009 [Turn Over

7   13 How many alkenes (including geomet ric isomers) can be obtained when 2-methylpentan-3-ol undergoes dehydration? CH3CHCHCH2CH3 CH3 OH A 1 B 2 C 3 D 4   14 Identify the number of sp 2 and sp3 carbon atoms in the given structure: CCCH HHO sp 2 sp3 A 8 5 B 9 4 C 2 5 D 3 4   SRJC 2009 8872/01/PRELIM/2009 [Turn Over

8 15 Which of the following statements is correct? A But-2-ene undergoes electrophilic substitution with aqueous bromine to form alcohols. B The halogen molecule undergoes heterol ytic fission during free radical substitution. C CH3CH2CH2OH is the major product formed when propene reacts with water under suitable conditions. D Ethane reacts with chlorine in the presence of light to form CH3CHCl2.   SRJC 2009 8872/01/PRELIM/2009 [Turn Over C 16 Fly paper is used as a non-toxic method of trapping houseflies . To increase its effectiveness and attractiveness, Muscalure, which is a fly sex pheromone, is added to the paper during the manufacturing process. Muscalure has the following structure: H3(CH2)7CH=C(CH3)(CH2)12CH3 Which of the following statements about Muscalure is incorrect? A In the presence of excess bromine and uv light, it undergoes free radical substitution. B It exists as a pair of geometrical isomers. C It reacts with HBr to form single product only. D It can be extracted from the fly paper by soaking the paper in benzene.

9 17 Experiments are carried out on three compounds: R, S and T. Cl CHClCH2CH2Cl CHClCHClCH3 CH2Cl CH2CHClCH3 ClCl R S T A sample of 0.01 mol of each compound is refluxed with 40 cm 3 of 1 mol dm -3 of aqueous sodium hydroxide in excess. Excess aqueous silver nitrate is added to the resulting mixture in each case and the mass of the precipitate weighed. What is the mass in grams, of the precipitate formed by each compound? R S T A 4.31 4.31 4.31 B 2.87 2.87 1.44 C 2.87 4.31 1.44 D 1.44 4.31 1.44