2019 TJC H2 Chem Prelim P1 QP

1 9729 / TJC Prelim / 2019 [Turn over TEMASEK JUNIOR COLLEGE 2019 JC2 PRELIMINARY EXAMINATION Higher 2 CHEMISTRY 9729/01 18th September 2019 1 hour Additional Materials: Multiple Choice Answer Sheet (OMS) 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. 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 16 printed pages including the cover page. Write your name and Civics Group Write and shade your index number

2 9729 / TJC Prelim / 2019 [Turn Over] 1 The number of neutrons and nucleons for five particles are shown below. The letters of the particles do not correspond to the identity of the elements in the Periodic Table. Particle Neutrons Nucleons U 16 33 V- 18 35 S2- 16 32 T2+ 17 34 Q3- 16 31 Which of the following sets consists of particles that are isoelectronic? A U, S2-, T2+ B U, S2-, Q3- C V-, S2-, Q3- D V-, T2+, Q3- 2 Methane was burned in an incorrectly adjusted burner. The methane was converted into a mixture of carbon dioxide and carbon monoxide in the ratio of 95 : 5, together with water vapour. What will be the volume of oxygen consumed when x dm3 of methane is burned? A (x – 2 x05.0 ) dm3 B (x – 0.05x) dm3 C (2x – 2 x05.0 ) dm3 D (2x – 0.05x) dm3

3 9729 / TJC Prelim / 2019 [Turn Over] 3 Which of the following particles contains the most number of unpaired electrons? A Na B P3- C V D Mn2+ 4 Nudic acid B is an acidic antibiotic isolated from the culture medium of the basidiomycete Tricholoma nudum (Bull.) Fr. What is the number of  and  bonds present in the molecule?  A 16 5 B 13 8 C 13 5 D 10 8 5 A pair of compounds have the following properties as described below. (i) The first compound has a larger bond angle about the central atom than the second compound. (ii) The second compound is more polar than the first compound. Which pair of compounds fit the description above? A BCl3, ClO2͞ B ICl2 ͞ , CO2 C HCN, XeF4 D ClO2͞