VJC 2022 JC1 Promo H2 Chem P2 QP

1 © VJC 2022 9729/02/PROMO [Turn over CANDIDATE NAME CT GROUP VICTORIA JUNIOR COLLEGE JC 1 PROMOTIONAL EXAMINATIONS Higher 2 ……………………………………………….………….. …………………………….. CHEMISTRY 9729//02 Paper 2 Structured Questions Candidates answer on the Question Paper. 30 September 2022 2 hours Additional Materials: Data Booklet READ THESE INSTRUCTIONS FIRST Write your index number, name and CT group in the spaces at the top of this page. Write in dark blue or black pen. You may use a HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Section A Structured Answer all questions in the spaces provided on the Question Paper. Section B Free Response Answer the question in the spaces provided on the Question Paper. A Data Booklet is provided. The use of an approved scientific calculator is expected, where appropriate. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use S1 /15 S2 /15 E1 /20 E2 /20 Total /70 This document consists of 19 printed pages and 1 blank page.

2 © VJC 2022 9729/02/PROMO [Turn over Section A: Structured Questions [30 marks] Answer all the questions in the spaces provided. S1 (a) The engine capacity of a car refers to the total volume of the combustion cylinders in the engine when the pistons are pushed out of the cylinders. The following experiment was conducted using a test engine where the combustion cylinders have a total volume of 200 cm3. • Ethane gas, CH3CH3, was mixed with air and injected into the cylinders. • The resultant fuel-air mixture (0.0280 mol) was then compressed and ignited. • The pistons are pushed out during the combustion process to bring the volume of the cylinders to a maximum . The final pressure and temperature was recorded to be 1.23 × 106 Pa and 753 oC respectively. (i) Using ideal gas equation, calculate the total number of moles of gaseous species in the cylinder after combustion of the fuel–air mixture. [2] (ii) Using your answer in (a)(i), calculate the change in the total number of moles of gaseous species for the combustion process. [1]

3 © VJC 2022 9729/02/PROMO [Turn over (iii) The complete combustion of 1 mol of ethane gas at 7 53 oC is represented by the following equation: