MI_H2_CHEM_P1 Prelim

Class Adm No Candidate Name: This question paper consists of 14 printed pages. [Turn over 2011 Preliminary Examination II Pre-university 3 H2 CHEMISTRY 9647/01 Paper 1 Multiple Choice 22 September 2011 Candidates answer on separate paper. 1 hour Additional Materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use paper clips, highlighters, glue or correction fluid. Write your name and class on all the Answer Sweet in the spaces provided. There are forty questions on 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 in soft pencil on the separate Answer Sheet. Read the instructions on the Answer Sheet very carefully. 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 booklet.

2 SECTION A (30 MARKS) Answer all questions on the OMR form provided 1. When a water molecule accepts a proton to form an hydronium ion, the magnitude of the change in bond angle is A 2.5o B 15.5o C 60.0o D 5.0o 2. The number of atoms of gas in flask X is approximately A one-fifth the number of atoms of gas in flask Y. B equal the number of atoms of gas in flask Y. C half the number of atoms of gas in flask Y. D five times the number of atoms of gas in flask Y. 3. The use of the Data Booklet may be necessary for this question. Successive ionization energy (I.E.) of element Z was tabulated: No. of e- removed 1 2 3 4 5 6 7 8 9 I.E. / kJ mol-1 1351 2350 3565 5070 6240 7570 10710 12138 22274 The likely identity of Z is A Chlorine B Bromine C Argon D Krypton 10 g helium 10 g neon

[Turn over 3 4. Samples of 100 cm3 of the first four members of the alkene homologous series are burnt in 800 cm3 of oxygen. The total volume, V, of residual gas is measure at room temperature and pressure. Which one of the following graphs represents the results that will be obtained? A B C D 5. Which of the following chlorides is likely to have the least ionic character? A CsCl B LiCl C BeCl 2 D CaCl2 V / cm3 No. of carbon atoms 2 3 4 5 V / cm3 No. of carbon atoms 2 3 4 5 V / cm3 No. of carbon atoms 2 3 4 5 V / cm3 No. of carbon atoms 2 3 4 5

4 6. The variation in oxidation states across Period 3 oxides is shown in the graph below. The trend above is best explained by A the variation in first ionisation energy of Period 3 elements across the Period. B increase in electronegativity of the elements across Period 3. C the presence of partially filled 3p subshell. D the stability of the oxides increases across the Period. 7.