JC2 Chemistry H1 2017 Catholic QP

1 [Turn over CHEMISTRY 8872/01 Paper 1 Multiple Choice Tuesday 29 August 2017 50 minutes Additional Materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Write your name, HT group and NRIC/FIN number on the Answer Sheet in the spaces provided. Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. 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. 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. The use of an approved scientific calculator is expected, where appropriate. This document consists of 10 printed pages Catholic Junior College JC 2 Preliminary Examinations Higher 1

2 8872/01/CJC JC2 Preliminary Examination 2017 Section A For each question there are four possible answers, A, B , C and D . Choose the one you consider to be correct. 1 A giant molecule contains a large amount of carbon; mainly of isotopes 12C and 13C. It was found that the relative atomic mass of carbon in the molecule is 12.2. What is the ratio of 12C to 13C? A 4:1 B 3:1 C 3:4 D 1:4 2 10 cm3 of a pure hydrocarbon X was completely burnt in 80 cm 3 of excess oxygen to give carbon dioxide gas and water vapour. After cooling to room temperature, the volume of gaseous mixture decreased from 105 cm 3 to 55 cm 3. A further reduction of 40 cm 3 was observed when the residual gas was passed through aqueous sodium hydroxide. All gas volumes were measured at the same temperature and pressure. What is the formula of X? A C 2H6 B C 3H8 C C 4H10 D C 5H12 3 A plasma is a gaseous mixture in which atoms have been completely stripped of their electrons, leaving bare nuclei. When passed through an electric field, the 1H nucleus is deflected at an angle of +4 o. What will be the angle of deflection for the 3H nucleus in the same plasma? A +0.75o B +1.3o C +4o D +12o 4 Use of the Data Booklet is relevant to this question. What do the ions 23Na+ and 24Mg2+ have in common? A Both ions have more electrons than neutrons. B Both ions have 12 neutrons in their nuclei. C Both ions contain the same number of nucleons in their nuclei. D Both ions have an outer electronic configuration of 3s2 3p6.

3 8872/01/CJC JC2 Preliminary Examination 2017 [Turn over 5 Use of the Data Booklet is relevant to this question. Which of the following particles would, on losing an electron, have a half-filled set of p orbitals? A C− B N C N− D O+ 6 The first seven successive ionisation energies (in kJ mol –1) of an element J are given below: 1020 1950 2730 4580 6020