ACJC_H1_CHEM_P1_Qn_Paper

ANGLO-CHINESE JUNIOR COLLEGE DEPARTMENT OF CHEMISTRY Preliminary Examination C H E M I S T R Y 8873/01 Higher 1 Paper 1 Multiple Choice 29 August 2018 1 hour Additional Materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, index number and tutorial 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 12 printed pages. 8873/01/Prelim/18 ANGLO-CHINESE JUNIOR COLLEGE © ACJC 2018 Department of Chemistry [Turn over

2 © ACJC 2018 8873/01/Prelim/2018 [Turn over 1 Use of the Data Booklet is relevant to this question. Which of the following statements is incorrect? A 35.5 g of chlorine gas contains 6.0 x10 23 chlorine atoms. B 24 dm3 of hydrogen gas at 20 °C and 1 atm contains 1.2 x 10 24 hydrogen atoms. C 500 cm3 of 1 mol dm–3 aqueous magnesium nitrate contains 3.0 x 1023 nitrate ions. D 4 g of helium gas contains 6.0 x 10 23 helium atoms. 2 Wines often contain a small amount of sulfur dioxide that is added as a preservative. The sulfur dioxide content of a wine is found by the following method: A 50 cm 3 sample of white wine reacted with 40.0 cm 3 of 0.01 mol dm –3 aqueous iodine. The sulfur dioxide in the wine is oxidised to sulfate, SO42–, in the process. SO2 + I2 + 2H2O SO 42– + 2I– + 4H+ The unreacted iodine requires exactly 23.60 cm 3 of 0.02 mol dm −3 sodium thiosulfate, Na2S2O3, for complete reaction. What is the concentration of sulfur dioxide, in mol dm−3, in the wine? A 1.64 x 10–4 B 3.28 x 10–3 C 4.72 x 10–3 D 9.44 x 10–3

3 © ACJC 2018 8873/01/Prelim/2018 [Turn over 3 Use of the Data Booklet is relevant