JJC_H1_CHEM_P1 Prelim

JURONG JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 1 CHEMISTRY 8872/01 Paper 1 Multiple Choice 25 August 2009 50 minutes 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, class and shade your exam number on the Answer Sheet in the spaces provided. 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 you 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. A Data Booklet is provided. Do not write anything on the Data Booklet. This document consists of 12 printed pages and 1 blank page. [Turn over

SECTION A For each question there are four possible answers, A, B, C and D . Choose the one you consider to be correct. 1. Hydrogen has three isotopes – hydrogen H, 1 1 ; deuterium D, ; tritium T, . H 2 1H 3 1H Which molecule contains the same number of neutrons as HT? A D2 B DT C HD D T2 2. Carbon disulphide vapour burns in oxygen according to the following equation. CS2(g) + 3O2(g)  CO2(g) + 2SO2(g) A sample of 10 cm 3 of carbon disulphide was burnt in 50 cm 3 of oxygen. After measuring the volume of gas remaining, the product was treated with an excess of aqueous sodium hydroxide and the volume of gas measured again. All measurements were made at the same temperature and pressure; under such conditions that carbon disulpide was gaseous. What were the measured volumes? volume of gas after burning/ cm3 volume of gas after adding NaOH(aq)/ cm3 A 30 0 B 30 20 C 50 20 D 50 40 3. Use of the Data Booklet is relevant to this question. The combustion of fossil fuels is a major source of increasing atmospheric carbon dioxide, with a consequential rise in global warming. Another significant contribution to carbon dioxide levels comes from the thermal decomposition of limestone, CaCO 3, in the manufacture of cement and of lime, CaO, for agricultural purposes. Cement works roast 1000 million tonnes of limestone per year and a further 200 million tonnes is roasted in kilns to make lime. What is the total annual mass output of carbon dioxide (in million tonnes) from these two processes? A 440 B 527 C 660 D 880 Page 2 of 12

4. The nickel-cadmium (Ni-Cd) rechargeable battery is based upon the following reaction. Cd + 2NiOOH + 4H2O  Cd(OH)2 + 2Ni(OH)2.H2O What is the oxidation number of nickel at the beginning and at the end of the reaction? beginning end A +1.5 +2 B +2 +3 C +3 +2 D +3 +4 5. Which reagent, when mixe