JJC_H2_CHEM_P1

JURONG JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 2 CHEMISTRY 9746/01 Paper 1 Multiple Choice 28 August 2009 1 hour Additional Materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class and shade your exam number on the Answer Sheet 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 you 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. A Data Booklet is provided. Do not write anything on the Data Booklet. This document consists of 16 printed pages and 1 blank page [Turn over

SECTION A (30 MARKS) For each question there are four possible answers, A, B, C and D . Choose the one you consider to be correct. 1. 0.904 g of Pb(C 2H3O2)2.dH2O was weighed and heated to drive off the water of crystallisation. The mass of the residue obtained was 0.774 g. Calculate the value of d in Pb(C2H3O2)2.dH2O. A 1 B 2 C 3 D 6 2. Tin(IV) iodide can be prepared by refluxing 0.04 mol of tin with 0.03 mol of iodine (I 2) dissolved in 50 cm3 of tetrachloromethane (boiling point 77C). Sn + 2I2 → SnI4 Orange crystals of the product are obtained by filtering the hot reaction mixture and then cooling the filtrate. What would indicate that the reaction was complete? A The boiling point of the mixture is 77C. B No tin remains in the reaction flask. C Crystals begin to be deposited from the boiling solvent. D No more purple vapour is seen in the reaction vessel. 3. It was believed that the bombardment of polonium atoms, Po, with atoms of an isotope of a Group III element, X, may bring about a new element with proton number 115 via the following reaction. Suggest the identity of X. Po + X  [new element] + 5 neutrons. 285 115 A Aluminium B Gallium C Indium D Thallium 209 84 Page 2 of 16

4. Two vessels containing 4 dm 3 of argon and 0.01m 3 of water vapour respectively at 150°C and 101 kPa were connected together. The connected vessels were allowed to cool to room temperature. What was the final pressure in the connected vessel? A 4.18 kPa B 16.8 kPa C 20.3 kPa D 71.2 kPa 5. The structure of propenoic acid is shown below. Which of the following statements is incorrect about the structure? A There are 8 σ bonds and 2 π bonds in the molecule. B All the carbon atoms lie on the same plane. C Bond angle x and y are 120º and 105° respectively