PJC H2 Chem 2012 Prelim P1 QP

Name: Index No.: CT Group: 11 PIONEER JUNIOR COLLEGE JC2 PRELIMINARY EXAMINATION HIGHER 2 CHEMISTRY 9647/01 Paper 1 Multiple Choice 20 September 2012 1 hour 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, Centre number and index number on the Answer Sheet in the spaces provided unless this has been done for you. There are forty 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. This document consists of 19 printed pages.

2 © PJC 2012 9647/01/JC2 PRELIM/2012 Section A For each question, there are four possible answers labelled A, B, C and D. Choose the one you consider to be correct. 1 Acidified, aqueous potassium manganate(VII) oxidises ethanedioate ions, C2O42-, to CO2. 2MnO4-(aq) + 5C2O42-(aq) + 16H+(aq) → 2Mn2+(aq) + 10CO2(g) + 8H2O(l) What is the concentration of potassium manganate( VII), in mol dm 3, if 20 cm 3 is required to completely oxidise 2.0 x 10-3 mol of the salt KHC2O4.H2C2O4? A 310 x 2.0x 20 1000 x 2 5 - B 310 x 4.0 x 20 1000 x 2 5 - C 310 x 2.0x 20 1000 x 5 2 - D 310 x 4.0 x 20 1000 x 5 2 - 2 The radioactive decay of polonium, Po210 84 , can be simply represented by the following equation. Po210 84 → Pb206 82 + α + 2e- What would be the path taken by the alpha particle, α, when it is passed through an electric field? source - + 1H+ A B C D

3 © PJC 2012 9647/01/JC2 PRELIM/2012 3 What are the values of angle x, y and z in a molecule of Disperse Yellow? C N N O CH3 NH O CH3 H x y Disperse Yellow z angle x angle y angle z A 90 115 105 B 90 180 180 C 120 115 105 D 120 180 115 4 Which of the following pairs of graphs share the same general shape according to ideal gas law for a fixed mass of gas? A p against V (at constant T) and V/T against T (at constant p) B pV against V (at constant T) and V/T against T (at constant p) C p against T (at constant V) and pV against p (at constant T) D V against T (at constant p) and pV against p (at constant T) 5 Travellers to countries with cold climate may sometimes use heat packs to keep warm. One example is the sodium ethanoate heat pack. This consists of a supersaturated solution of sodium ethanoate and a small metal disc containing very small crystals of sodium ethanoate. When the disc is broken, the small crystals of sodium ethanoate are released into the solution and act as nucleation sites to catalyse the crystallisation reaction of sodium ethanoate. Which line gives the signs of ∆H, ∆S and ∆G for the