AJC_H1_CHEM_P1

ANDERSON JUNIOR COLLEGE 2009 PRELIMINARY EXAMINATION HIGHER 1 _________________________________________________________________________________ CHEMISTRY 8872/01 Paper 1 Multiple Choice 18 September 2009 5 0 m i n u t e s Additional Materials : Multiple Choice Answer Sheet Data Booklet _________________________________________________________________________________ READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name and PDG. Write your NRIC / FIN and shade the digits accordingly. 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. 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. _________________________________________________________________________________ This paper consists of 10 printed pages including this cover page.

2 Section A For each question there are four possible answers, A, B, C, and D. Choose the one you consider to be correct. 1 Copper, in the form of CuFeS 2, is extracted from ores in copper mines. The ore contains 1.0 % by mass of copper. What percentage of the ore contains CuFeS2, if it is the only copper-containing component of the ore? A 1.0 % B 2.9 % C 3.46 % D 34.6 % 2 When the salt (C2H5)4N+Cl– is treated with hydrogen chloride, a white ionic solid E is formed. When E is dissolved in water, a 20 cm 3 sample of the solution requires 24 cm 3 of 0.1 mol dm –3 NaOH for neutralization. Another 20 cm 3 sample of the solution requires 48 cm 3 of 0.1 mol dm –3 AgNO 3 for complete precipitation of chloride as AgCl. What could be the formula of the anion in E? A HCl 2 – B HCl3 2– C H2Cl3 – D H2Cl5 3– 3 Wines often contain a small amount of sulfur dioxide that is added as a preservative. The sulfur dioxide content of a wine can be found by titrating with aqueous iodine, I2, to give iodide, I-. The sulfur dioxide becomes oxidised in the process. SO2 + 2H2O  SO4 2- + 4H+ + 2e- In an experiment, a student found that the sulfur dioxide in a 100 cm 3 sample of white wine reacted with exactly 20.00 cm3 of 0.01 mol dm-3 aqueous iodine. What is the concentration of sulfur dioxide in the sample of white wine, in mol dm-3? A 1.00 x 10−4 B 2.00 x 10−4 C 1.00 x 10−3 D 2.00 x 10−3 4 Chlorine has the electronic configuration 1s2 2s2 2p6 3s2 3p5. Which chlorine compound is not likely to exist? A KClO5 B CuCl C Cl2O7 D Cl2O

3 5 Gallium nitride, GaN, could revolutionise the design of electric light bulbs because only a small length used as a filament gives excellent