AJC_H1_CHEM_P2

ANDERSO N JUNIOR COLLEGE 2009 PRELIMINARY EXAMINATION HIGHER 1 _______________________________________________________________________ C H E M I S T R Y 8872/02 Paper 2 18 September 2009 2 hours Candidates answer Section A on the Question Paper. Additional Materials : Writing Paper Data Booklet _______________________________________________________________________ READ THESE INSTRUCTIONS FIRST Write your name and PDG on all the work you hand in. Write in dark blue or black pen on both sides of the paper. You may use a soft pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. Section A Answer all questions. Section B Answer any two questions on separate answer paper. A Data Booklet is provided. The number of marks is given in brackets [ ] at the end of each question or part question. At the end of the examination, attach your answer for Section B to this question paper. For Examiner’s Use Q1 Q2 Q3 Section A Q4 Section B Total 80 Name: ……………………………………( ) PDG: ……………………………………. _______________________________________________________________________ This paper consists of 14 printed pages including this cover page. Anderson Junior College H1 Chemistry Preliminary Examination 2009 1

Anderson Junior College H1 Chemistry Preliminary Examination 2009 2 Section A Answer all questions in this section in the spaces provided. 1 (a) What is meant by the term empirical formula? ………..……….…………………………………………………………………………………………… ……….……………………………………………………..……………………………………………[1] (b) A gaseous hydrocarbon, A, has a composition by mass: C, 85.7 %; H, 14.3 %. (i) Calculate the empirical formula of the hydrocarbon, A. Empirical Formula of compound A : …………………………………………………………………… (ii) When 10 cm 3 of A underwent complete combustion in excess oxygen, the remaining gases occupied 100 cm 3 at 120 oC and 1 atm. When the gases were cooled to room temperature and pressure, the volume of gases was reduced to 60 cm3. Determine the molecular formula of A. [3]

(c) Draw the structural formulae of all the isomers of compound A and state the type(s) of isomerism displayed. [4] [Total: 8] 2 (a) The kinetics of the acid–catalysed reaction of propanone with iodine C H 3COCH3(aq) + I2(aq) CH2ICOCH3(aq) + HI(aq) can be investigated e xperimentally by varying the concentrations of the three substances involved. The following results were obtained in an experiment. [H +] = 0.10 mol dm–3 [CH3COCH3] = 0.10 mol dm–3 [I2] / mol dm–3 [H+] = 0.20 mol dm–3 time / min 3 Anderson Junior College H1 Chemistr y Preliminary Examination 2009

(i) Deduce the ord