PJC_H2_CHEM_P1

PIONEER JUNIOR COLLEGE, SINGAPORE JC2 PRELIMINARY EXAMINATIONS HIGHER 2 CHEMISTRY 9746/01 Paper 1 Multiple Choice 24 September 2009 1 hour Additional Materials: Data Booklet Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Write your name, CT Group and index number on the Answer Sheet in the spaces provided unless this has already been done for you. There are forty 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 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 calculator may be used. This document consists of 14 printed pages. [Turn over

2 Section A For each question, there are four possible answers labelled A, B, C and D . Choose the one you consider to be correct. 1 A radioactive isotope of thallium, , is used to assess damage in heart muscles after a heart attack. lT201 81 Which statement about is correct? lT201 81 A The isotope has a nucleon number of 120. B The number of electrons in one atom of this isotope is 81. C The number of neutrons in one atom of this isotope is 201. D is an isotope of . lT201 82 lT201 81 2 Use of the Data Booklet is relevant to this question. Oxides of nitrogen are pollutant gases which are emitted from car exhausts. In urban traffic, when a car travels one kilometre, it releases 0.23 g of an oxide of nitrogen NaOb, which occupies 120 cm3 at room temperature and pressure. What are the values of a and b? A a = 1, b = 1 B a = 1, b = 2 C a = 2, b = 1 D a = 2, b = 4 3 Plastic bottles for ‘fizzy drinks’ are made from a polymer with C C H H E H H H n The ability of the polymer to prevent the escape of carbon dioxide through the wall of the bottle depends on the ability of the group E to form hydrogen bonds with the carbon dioxide in the drink. Which group E best prevents the loss of carbon dioxide? A Cl C CO 2CH3 B CN D OH © PJC 2009 9746/01/Prelim/S/09 [Turn over

3 4 Which one of the following graphs below shows the correct plot of pV against p for a fixed mass of ideal gas at two temperatures, T1 and T2, in which T1 > T2? A C p T2 T1 pV TpV 2 T1 p B D pV T2 T1 p T2 T1 pV p 5 The standard enthalpy changes of formation of HCl and HI are –92 kJ mol -1 and +26 kJ mol -1 respectively. Which statement is most important in explaining this difference? A The bond energy of H I is smaller than the bond energy of HCl. B The bond energy of I2 is