2019 TMJC H2 Chem Prelim P1 QP

Tampines Meridian Junior College 2019 JC2 Prelim H2 Chemistry _________________________________________________________________________________ H2 CHEMISTRY 9729/01 Paper 1 Multiple Choice 26 September 2019 1 hour Additional Materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class and index number on the Answer Sheet in the spaces provided unless this has been done for you. There are thirty 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. 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. The use of an approved scientific calculator is expected, where appropriate. This document consists of 18 printed pages. TAMPINES MERIDIAN JUNIOR COLLEGE JC2 PRELIMINARY EXAMINATION

2 Tampines Meridian Junior College 2019 JC2 Prelim H2 Chemistry 1 Some data of the ions of four unknown elements are given in the table below. A+ B– D2– E3– mass number 21 20 20 21 number of protons – 11 9 – number of electrons 9 – – 12 Which of the following correctly shows pairs of isotopic and isoelectronic species? isotopic isoelectronic A D2–, E3– B–, E3– B B–, D2– A+, B– C B–, D2– B–, E3– D D2–, E3– A+, B– 2 The first six ionisation energies of element G are plotted in the graph below. number of electrons removed Which of the following can be deduced from the graph? A There are 2 quantum shells in element G. B Element G is from Group 2 in the Periodic Table. C The fifth and sixth electrons are removed from the same subshell. D The identity of element G is carbon. log10 (ionisation energy)

3 Tampines Meridian Junior College 2019 JC2 Prelim H2 Chemistry 3 For which of the following pairs does the first molecule have a higher polarity than the second molecule? 1 CH3OH, CH3I 2 CF4, CCl4 3 cis-CHF=CHF, trans-CHF=CHF A 1 only B 1 and 3 C 2 and 3 D 1, 2 and 3 4 Three substances H, I and J have physical properties shown in the table below. substance melting point/ °C boiling point/ °C electrical conductivity of solid of liquid H 801 1413 poor good I 2852 3600 poor good J 3500 at very high pressure unable to determine poor unable to determine What are the possible identities for substances H, I and J? H I J A NaCl AlCl3 C (diamond) B MgO AlCl3 C (graphite) C NaCl MgO C (graphite) D NaCl MgO C (diamond)

4 Tampines Meridian Junior College 2019 JC2 Prelim H2 Chemistry 5 Which of the following diagrams correctly describe the behaviour of a fixed mass of an ideal gas at