2021_YIJC_Prelim_P1_Qns

©YIJC [Turn Over YISHUN INNOVA JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 1 CANDIDATE NAME CG INDEX NO CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet Data Booklet 8873/01 16 September 2021 1 hour READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid/tape. 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 10 printed pages and 2 blank pages.

2 @YIJC [Turn Over 1 10 cm3 of a hydrocarbon CxHy was exploded with an excess of oxygen. There was a contraction of 30 cm 3. When the product was treated with a solution of potassium hydroxide, there was a further contraction of 40 cm3. What is the molecular formula of the hydrocarbon? [All gas volumes are measured at r.t.p.] A C4H8 B C4H10 C C3H6 D C3H8 2 Three organic molecules each have • three elements; • the composition, by mass, C, 54.5 %; H, 9.1 %. What could these molecules be? 1 CH3CH2CH2CO2H 2 OHCCH2CH2CH2OH 3 CH3CH=CHCH2SH A 1, 2 and 3 B 1 and 2 C 2 and 3 D 1 and 3 3 Use of the Data Booklet is relevant to this question. In which series of elements do the atoms have the same number of neutrons as protons? 1 4He, 12C, 24Mg 2 14N , 20Ne , 30P 3 28Si, 34S, 40Ca, A 1, 2 and 3 B 1 and 2 C 2 and 3 D 1 and 3 4 Which of the species in their gaseous state shown below will be deflected by the largest angle in an electric field? A 11B3+ B 4He2+ C 9Be2+ D 1H2

3 @YIJC [Turn Over 5 Which of the following shows the correct bond angles x, y and z for ethanoic acid as shown below? x y z A 90° 120° 109° B 109° 120° 105° C 109° 180° 109° D 90° 180° 105° 6 Consider the following four compounds. What is the order of increasing boiling point of