2021 YIJC Prelim P1 QP

©YIJC [Turn over YISHUN INNOVA JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 2 CANDIDATE NAME CG INDEX NO CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet Data Booklet 9729/01 16 September 2021 1 hour 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 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. 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.

2 ©YIJC [Turn over 1 A 1.00 g alkane D was burnt in an excess of oxygen, and the gases that were produced were first passed through a U-tube containing phosphorus pentoxide and another U-tube containing NaOH(s) as shown in the diagram. The phosphorus pentoxide U -tube increased in mass by 1.55 g, and the NaOH(aq) bottle increased in mass by 3.03 g. All volumes were measured at room temperature and pressure. What is the molecular formula of the alkane D? A CH4 B C2H5 C C2H6 D C4H10 2 Use of the Data Booklet is relevant to this question. What do the ions 36S2 and 37Cl have in common? A Both ions have more electrons than neutrons. B Both ions have the same electronic configuration. C Both ions contains the same number of nucleons. D 36S2 has a smaller angle of deflection than 37Cl in an electric field. 3 Boyle’s law states that at constant temperature, the volume of a fixed mass of gas is inversely proportional to its pressure. Which of the following statements shows application of Boyle’s law? 1 Human lungs, inhalation and exhalation. 2 Spraying paint from a can. 3 Working of hot air balloon. A 1, 2 and 3 B 1 and 2 only C 2 and 3 only D 1 only Oxygen gas used oxygen gas Phosphorous pentoxide NaOH(s) pellets Alkane D

3 ©YIJC [Turn over 4 Carmine is a red colorant extracted from the bodies of dead female insects, used in food colouring and lipsticks. The proposed structure of carmine is as shown. The Al+ ion is situated in the centre of a planar arrangement of numbered oxygen atoms. Which of the following descriptions of the bonds between Al+ and the numbered O atoms is most likely to be cor