HCI Prelim_P1

This document consists of 16 printed pages. HWA CHONG INSTITUTION C2 Preliminary Examinations Higher 2 CANDIDATE NAME CT GROUP 14S CENTRE NUMBER INDEX NUMBER CHEMISTRY Paper 1 Multiple Choice Additional Materials: Optical Mark Sheet (OMS) Data Booklet 9647/01 18 September 2015 1 hour READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Complete the information on the optical mark sheet (OMS) as shown below. 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 OMS. 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.

2 © Hwa Chong Institution 2015 9647 / 01 / C2 Prelim 2015 SECTION A For each question, there are four possible answers A, B, C and D. Choose the one you consider to be correct. 1 10 cm3 of a hydrocarbon wa s mixed with 50 cm3 of oxygen and combusted completely. After the resulting gas mixture was cool ed and passed through aqueous sodium hydroxide, the volume of the residual gas mixture was found to be ¼ the volume of the original gas mixture before combustion. All volumes were measured at room temperature and pressure. What is the formula of the hydrocarbon? A C2H4 B C2H6 C C3H6 D C3H8 2 Equal volumes of 1 mol dm −3 hydrogen sulfide and sulfur dioxide (each containing a different isotope of sulfur) are mixed to precipitate sulfur according to the equations shown below: H2 32S(aq) → 32S(s) + 2H+(aq) + 2e− 34SO2(aq) + 4H+(aq) + 4e− → 34S(s) + 2H2O(l) What is the relative atomic mass of the sulfur precipitated? A 32.1 B 32.7 C 33.0 D 33.3 3 Use of the Data Booklet is relevant to this question. Which particle would, on losing an electron, have a half-filled set of d orbitals? A Cr B Mn2+ C Fe3+ D Cr2+

3 © Hwa Chong Institution 2015 9647 / 01 / C2 Prelim 2015 4 Which of the following pairs of liquids are immiscible? A (CH3)2CO and H2O C CCl4 and H2O B CH2Cl2 and (CH3)2CO D CCl4 and CH3CHO 5 A solid E has the following physical properties.  It is insoluble in non-polar solvents.  It melts at 1290 oC.  It conducts electricity in both aqueous and molten states. What is the likely structure of E? A a giant ionic structure C a giant covalent structure B a simple covalent structure D a metallic structure 6 The value of pV/RT is plotted against p for one mole of each of the two non -ideal gases L and M, where p is the pressure, V is the volume and T is the temperature of the gas.