2019 HCI Prelim H2 Chem P1 QP

This document consists of 12 printed pages. HWA CHONG INSTITUTION C2 Preliminary Examinations Higher 2 CANDIDATE NAME CT GROUP 18S CENTRE NUMBER INDEX NUMBER CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet Data Booklet 9729/01 25 September 2019 1 hour READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Complete the information on the Answer Sheet as shown below. There are 30 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 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.

© Hwa Chong Institution 2019 9729 / 01 / C2 Prelim 2019 2 1 Which statement about relative atomic mass is correct? A It is the average of the masses of all the isotopes of that element. B It is the sum of the relative masses of the neutrons and protons in each atom. C It is the ratio of the average mass of one atom of an element to the mass of one 1H atom. D It is the ratio of the mass of one mole of atoms of an element to one-twelfth the mass of one mole of 12C atoms. 2 Which of the graphs correctly represent the trends in some properties of the Period 3 elements? 1 2 3 4 A 1 and 2 B 2 and 3 C 3 and 4 D 1, 2 and 4 electronegativity Na Mg Al Si P S Cl atomic radii Na Mg Al Si P S Cl electrical conductivity Na Mg Al Si P S Cl melting point Na Mg Al Si P S Cl

© Hwa Chong Institution 2019 9729 / 01 / C2 Prelim 2019 3 3 Which of the following correctly describes the structure and bonding present in the solid lattice of the substances given? substance structure bonding A ice giant covalent covalent bonding + hydrogen bonding B iodine simple covalent covalent bonding + permanent dipoles C aluminium chloride giant ionic ionic bonding + permanent dipoles D graphite giant covalent covalent bonding + dispersion forces 4 In which of the following pairs is the bond angle in the first species smaller than that in the second species? A NH4+ XeF4 B NF3 NH3 C NO2+ SO2 D BCl3 PCl3 5 A container with a volume of 420 m3 with an internal pressure of 1 bar at 293 K was joined to two containers as shown below. One of them has a volume of 13 m 3 with a vacuum within, while the other has a volume of 75.5 m 3 with an internal pressure of 2 bar and a temperature of 273 K.