2013_TPJC_H1_Chemistry_P1 QP

TPJC_2013_8872_01 [Turn over READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name and civics group on the Answer Sheet in the spaces provided. 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. 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 on this paper. This document consists of 13 printed pages and 1 blank page. TAMPINES JUNIOR COLLEGE JC2 Preliminary Examination CANDIDATE NAME TUTOR NAME 1 2 CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet Data Booklet 8872/01 Monday, 23 September 2013 50 minutes H1 CIVICS GROUP

2 TPJC_2013_8872_01 Section A For each question there are four possible answers, A, B, C and D. Choose the one you consider to be correct. 1 Use of the Data Booklet is relevant to this question. How many molecules are present in 1 cm3 of oxygen gas under room conditions? A 231002.6 240001 × × B 24000 1002.61 23×× C 10001 240001002.6 23 × ×× D 321002.61 23××× 2 Which of the following ions would undergo the greatest deflection in an electric field? A 16O2+ B 16O18O+ C 16O18O2+ D 18O2+ 3 10 cm3 of 0.2 mol dm−3 K2XO4 will just react with 40 cm3 of 0.1 mol dm−3 iron(II) sulfate solution. If Fe2+ is oxidized to Fe3+ by K2XO4, what is the final oxidation state of X? A +2 B +3 C +4 D +5 4 The table gives the successive ionisation energies for an element X. 1st 2nd 3rd 4th 5th 6th Ionisation energy/ kJ mol−1 950 1800 2700 4800 6000 12300 What could be the formula of the chloride of X? A XCl B XCl2 C XCl3 D XCl4

3 TPJC_2013_8872_01 [Turn over 5 Which of the following consists of species which are all planar? A CO32– , SO32– and benzene B Al2Cl6 , SOCl2 and methanal C NO3– , XeF4 and ethanal D BCl3 , ICl4− and chlorobenzene 6 Dot-and-cross diagrams for carbon monoxide are shown. Which circled pair of electrons represents a coordinate bond? A B C D 7 The diagram shows the Boltzmann distribution of the speeds of the molecules of a gas. Point X represents the most probable speed. If the gas is cooled, in which direction does X move? 8 Iodine-131 is a radioactive isotope with a half-life of 8 days. Given that radioactive decay is a first-order reaction, what fraction of the isotope would remain after 80 days? A 20 1 B 160 1 C 82 1 D 102 1

4 TPJC_2013_8872_01 9 The table shows the charge and radius of each of six ions. ion J+ L+ M2+ X− Y− Z2− radius/ nm 0.14 0.18 0.15 0.14 0.18 0.15 The ionic solids JX, LY, and MZ have the same