SAJC_H2_CHEM_P1 Prelim

1 [Turn Over ST ANDREW’S JUNIOR COLLEGE JC2 Preliminary Examinations Chemistry Higher 2 9647/01 Paper 1 Multiple Choice 22 September 2011 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. There are 40 questions on this paper. Answer all questions. For each question there are four possible answers A, B, C and D. Chose the one you consider correct and record your choice in soft pencil on the separate Answer Sheet. 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. This document consists of 19 printed pages including this page.

2 [Turn Over Section A For each questions, there are four possible answers, A, B, C and D. Choose the one you consider to be correct. 1 A bottle of unknown hydrocarbon was found in a laboratory and had the following information on its label: Boiling point / C 63.0 Melting point/ C -139.8 Density / g cm-3 0.673 When 25 cm3 of this hydrocarbon was burned in excess oxygen, 28.8 dm 3 of gas was formed at room temperature and pressure. Which of the following could be the empirical formula for this hydrocarbon? A CH2 B CH3 C C5H12 D C6H12 2 Sulfur compounds exist in multiple oxidation states. Which of the following options arranges compounds in increasing oxidation state of sulfur? A SO4 2- , SO2, S, H2S B S, H2S, SO2, SO4 2- C S, SO2, H2S, SO4 2- D H2S, S, SO2, SO4 2- 3 Which of the following is an isotope of oxygen? A B C 2 D 2

3 [Turn Over 4 In an experiment, the length of a hydrogen bond formed between HF molecules was measured to be 155 pm while that formed between H2O molecules was 197 pm. (1 pm = 10-12 m) Which is not a possible explanation for the above observations? A Oxygen is bigger than fluorine B Fluorine is more electronegative than oxygen. C The hydrogen bond between HF molecules is weaker than between H2O molecules. D The lone pair involv ed in hydrogen bonding in HF is in a smaller orbital compared to the lone pair involved in H2O. 5 Which of the following compounds is planar? A C6H5CH3 B [CuCl4]2- C C6H14 D O3 6 Sodium ethanoate is used in food additives as it is safe to consume. Which of the following is most likely to be true for sodium ethanoate? A It is more soluble in water than sodium chloride. B It has a lower melting point than sodium chloride. C A solution of sodium ethanoate is more acidic than a solution of sodium chloride. D A solution of sodium ethanoate has a higher electrical conductivity than a solution of sodium chloride.

4 [Turn Over 7 Which graph best represents the behaviour of an ideal gas at constant temperature, where the ratio of the number of moles