2019 ASRJC Prelim H2 Chem P1 QP

ASRJC JC2 PRELIMS 2019 9729/01/H2 [Turn over ANDERSON SERANGOON JUNIOR COLLEGE 2019 JC 2 PRELIMINARY EXAMINATIONS CHEMISTRY 9729/01 Higher 2 19 September 2019 Paper 1 Multiple Choice 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 and class 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 in this booklet. The use of an approved scientific calculator is expected, where appropriate. This document consists of 18 printed pages and 2 blank pages.

2 ASRJC JC2 PRELIMS 2019 9729/01/H2 1 Use of the Data Booklet is relevant to this question. The 68Ge isotope is medically useful because it undergoes a natural radioactive process to give an isotope of a different element, 68Q, which can be used to detect tumours. This transformation of 68Ge occurs when an electron enters the nucleus and changes a prot on into a neutron. Which statement about the composition of an atom of 68Q is correct? A It has 4 electrons in its outer p orbitals. B It has 13 electrons in its outer shell. C It has 37 neutrons. D Its proton number is 32. 2 The successive ionisation energies (IE) of two elements X and Y are given in the table. IE / kJ mol–1 1st 2nd 3rd 4th 5th 6th 7th 8th X 786 1580 3230 4360 16000 20000 23600 29100 Y 1300 3380 5310 7460 8670 9330 22060 27070 What compound is most likely to be formed when X and Y are combined? A ionic, with formula X2Y B ionic, with formula XY2 C covalent, with formula XY2 D covalent, with formula X2Y

3 ASRJC JC2 PRELIMS 2019 9729/01/H2 [Turn over 3 Plants appear green due to the presence of chlorophyll. There are several closely related chlorophylls and the diagram shows a simplified version of one. The various different side–groups are all shown as R. Note that the four N atoms and the Mg ion are planar. Which of the descriptions of the bonds between Mg and the numbered N atoms is most likely to be correct? N atoms numbered 1 and 3 2 and 4