READ THESE INSTRUCTIONS FIRST On the separate multiple choice OMS given, write your name, FIN/NRIC and class in the spaces provided. Shade correctly your class and FIN/NRIC number. Eg. If your NRIC is S9306660Z, shade S9306660Z for the item “index number”. There are forty questions in this paper. Answer all questions. For each question there are four possible answers A, B, C and D. Choose the one you consider correct and record your choice using a soft pencil on the separate OMS. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. You are advised to fill in the OMS as you go along; no additional time will be given for the transfer of answers once the examination has ended. Any rough working should be done in this question paper.
This document consists of 20 printed pages and no blank page.
Section A For each question there are four possible answers, A, B, C and D. Choose the one you consider to be correct. 1 A student added 10 cm3 of 0.2 mol dm−3 KI (aq) to 10 cm3 of 0.2 mol dm−3 CuSO4 (aq) in a beaker and observed that a white precipitate in brown solution was obtained. She knew that if she were to add S2O32− (aq) to the mixture, the brown solution will be decolourised. Calculate the volume of 0.04 mol dm−3 S2O32− (aq) she should add to the mixture in the beaker in order to completely decolourise the brown solution. A B C D 2 12.5 cm3 15.0 cm3 16.7 cm3 25.0 cm3
Which of the following contains the greatest amount (in mol) of particles? A B C D 600 g of I2 (s) 50 cm3 of H2O (l) 50 dm3 of HCl (g) at s.t.p. 550 cm3 of 2.5 mol dm–3 CH3COOH (aq)
An element, E can form a simple ion, E2+. Which of the following is the electronic configuration of an atom of E? A B C D 1s2 2s2 2p6 3s2 3p2 1s2 2s2 2p6 3s2 3p4 1s2 2s2 2p6 3s2 3p6 4s1 1s2 2s2 2p6 3s2 3p6 3d5 4s2
9647 / 01 / Prelim / 2011
In 1996, Professor Hoffman and a group of scientists discovered a new element known as Ununbium, Uub. An atom of Uub can be formed by the fusion of a lead nucleus with the nucleus of an isotope of element G as follows: 208 82Pb
+ 1 neutron
What is G? A B C D Cu Zn Ga Ge
Which of the following graphs correctly describes the behaviour of a fixed mass of ideal gas? V/m3 constant P V/m3 constant P
0 B V/m
9647 / 01 / Prelim / 2011
Which of the following consists of three compounds with different types of structure? A B C D BeO, SO2, BH3 BeCl2, Na2O, SiO2 AlF3, MgCl2, BN AlCl3, Cu2O, SiCl4
Ethyl ethanoate undergoes hydrolysis in water in the presence of dilute hydrochloric acid catalyst. HCl CH3COOCH2CH3 + H2O CH3COOH + CH3CH2OH The rate of reaction was investigated by varying the concentrations of the ester and HCl. Experiment 1 2 3 [ethyl ethanoate] / mol dm-3 0.10 0.15 0.10 [HCl] / mol dm-3 0.20 0.10 0.10 Initial rate / mol dm-3 min-1 0.096 0.072 0.048
Which of the following statements about the above reaction is correct? A B C D Half-life for experiment 1 is 0.144 min. The rate equation of this reaction is rate = k[CH3COOCH2CH3][ H2O]. Tripling the concentration of both ethyl ethanoate and HCl increases the rate of reaction by a factor of 6 If the half life of ethyl ethanoate in experiment 1 is 5.0 min, then the half life of ethyl ethanoate in experiment 3 will be 10.0 min.
When 2.4 g of Na2CO3 was added to 50 cm3 of 1.0 mol dm-3 aqueous hydrochloric acid, the temperature of the solution rose by 3.2 oC What is the enthalpy change of neutralisation of this reaction? (Assume that 4.20 J is required to raise the temperature of 1 cm3 of...