2021 C1 Promo P3 QP

This question booklet consists of 14 printed pages. HWA CHONG INSTITUTION C1 Promotional Examination Higher 2 CANDIDATE NAME CT GROUP 21S CHEMISTRY Paper 3 Free Response Candidates answer on the Question Paper. Additional Materials: Data Booklet 9729/03 30 September 2021 55 min READ THESE INSTRUCTIONS FIRST Write your name and class on all the work you hand in. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Answer all questions in the spaces provided on the Question Paper. If additional space is required, you should use the pages at the end of this booklet. The question number and part must be clearly shown. Section A Question 1 is a compulsory question. Section B Answer only one question from this section. The use of an approved scientific calculator is expected, where appropriate. A Data Booklet is provided. You are reminded of the need for good English and clear presentation in your answers. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use Question No. Marks obtained 1 / 20 ^Circle the question attempted below ^ 2 / 3 / 15 Deductions (s.f.) Deductions (units) Deductions (margins) Deductions (others) Total Marks 35 No. of sheets of writing paper submitted (write 0 if none)

2 © Hwa Chong Institution 2021 9729/03/C1 Promo 2021 [Turn over Section A Question 1 is a compulsory question. All candidates should answer this question. 1 (a) The volume of 1 mole of carbon dioxide gas was measured at a temperature of 12 C, when various pressures were applied. The following results were obtained. Table 1.1 pressure, p /kPa volume, V /dm3 pressure  volume, pV /kPa dm3 500 4.62 2310 1000 2.25 1500 1.46 2000 1.07 2140 DO NOT WRITE IN THIS MARGIN B, L 3(c) (i) Complete the third column of Table 1.1. Use your values of pV to estimate the value of pV when p = 1250 kPa. Use your estimated value of pV to calculate the value of V when p = 1250 kPa. [2] A, L 3(c) (ii) Predict by calculation, the volume, V, of 1 mole of carbon dioxide gas at 12 C and 1250 kPa, if it were to behave ideally. [1] B, M 3(b)(i)( ii) (iii) Suggest an explanation of the difference in the values of V you have obtained in (a)(i) and (a)(ii), in terms of the properties of CO2 molecules. [2] ……………………………………………………….………………………………………… ……………………………………………………….………………………………………… ……………………………………………………….………………………………………… ……………………………………………………….………………………………………… ……………………………………………………….………………………………………… ……………………………………………………….………………………………………… ……………………………………………………….………………………………………… ……………………………………………………….………………………………………… ……………………………………………………….………………………………………… ……………………………………………………….………