RVHS H2 Chem 2013 Prelim P3 QP

River Valley High School 9647/03/PRELIM/13 [Turn overPreliminary Examination 2013 RIVER VALLEY HIGH SCHOOL YEAR 6 PRELIMINARY EXAMINATION CANDIDATE NAME CLASS 6 CENTRE NUMBER S INDEX NUMBER H2 CHEMISTRY 9647/03 Paper 3 Free Response 16 September 2013 2 hours Candidates answer on separate paper. Additional Materials: Answer Paper Cover Page Data Booklet READ THESE INSTRUCTIONS FIRST Write your name, class, centre number and index number on all the work you hand in. Write in dark blue or black pen on both sides of 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. Answer any four questions. Begin each question on a fresh sheet of paper. A Data Booklet is provided. Do not write anything on it. You are reminded of the need for good English and clear presentation in your answers. The number of marks is given in brackets [ ] at the end of each question or part question. At the end of the examination, fasten all your work securely together, with the cover page on top. _______________________________________________________________________________ This document consists of 11 printed pages and 1 blank page. 1100

2 River Valley High School 9647/03/PRELIM/13 [Turn overPreliminary Examination 2013 Answer any four questions. 1 (a) Orthocaine, C 8H9O3N, is a local anaesthetic t hat causes temporary loss of pain. Orthocaine:  rapidly decolourises aqueous bromine to give A, C8H6O3NBr3.  gives a violet colouration on addition of neutral FeCl 3 (aq).  dissolves in NaOH(aq) to give B, NaC8H8O3N.  reacts with HCl (aq) to give a positively-charged ion C, C8H10O3N.  reacts in the presenc e of hot acidified KMnO 4(aq) to release a colourless gas that gives a white precipitate with limewater. Suggest the structures of orthocaine and A – C , explaining your reasoning. [9] (b) N2O, commonly known as laughing gas, is used in surgery and dentistry for its anaesthetic effect. Other than N 2O, other oxides of nitrogen include NO2 and NO. NO2 can be formed from NO as shown below: 2NO(g) + O2(g)  2NO2(g) Three experiments were carried out to find the relationships between the initial concentrati ons of NO and of O 2 and the initial rate of formation of NO2. Experiment Initial [NO] / mol dm3 Initial [O2] / mol dm3 Initial rate of formation of NO2 / mol dm3 s1 1 0.001 0.002 1.40  105 2 0.002 0.003 8.40  105 3 0.003 0.003 1.89  104 (i) Determine with reasoning, the order of reaction with respect to each of the reactants and the rate constant, k, stating its units. (ii) Calculate the initial rate of depletion of O 2 when [NO] = 0.002 mol dm3 and [O2] = 0.002 mol dm3. [5] 1101

3 River Valley High School 9647/03/PRELIM/13 [Turn overPreliminary Examination 2013 (c) NO2 can react with water to form nitric acid