TJC Prelim P1_Qn

1 2017 TJC H2 Chemistry Preliminary Examination [Turn Over CHEMISTRY 9729/01 Paper 1 Multiple Choice 15th September 2017 1 hour Additional materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST 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 13 printed pages. Write your name and Civics Group Write and shade your index number

2 2017 TJC H2 Chemistry Preliminary Examination [Turn Over 1 The reaction between aluminium powder and anhydrous barium nitrate is used as the propellant in some fireworks. Nitrogen gas is one of the products formed. Which volume of nitrogen, measured under room conditions, is produced when 1 g of anhydrous barium nitrate reacts with an excess of aluminium? A 86.9 cm3 B 91.8 cm3 C 174 cm3 D 184 cm3 2 Which statements about relative molecular mass are correct? 1 It is the mass of one mole of the molecule. 2 It is the ratio of the average mass of a molecule to the mass of a 12C atom. 3 It is the sum of the relative atomic masses of all the atoms within the molecule. A 1, 2 and 3 B 2 and 3 only C 2 only D 3 only 3 The Claus process recovers sulfur from the gaseous hydrogen sulfide found in raw natural gas and from the crude oil refinery by-product gases. reaction I 2H2S(g) + 3O2(g) → 2H2O(l) + 2SO2(g) reaction II 2H2S(g) + SO2(g) → 2H2O(l) + 3S(s) Which statement about the Claus process is correct? A SO2 is a reducing agent. B SO2 behaves as a catalyst. C H2S is oxidised in the reaction. D Reaction II is a disproportionation reaction. 4 A stream of gaseous, doubly-charged calcium ions was passed between 2 oppositely charged plates. Analysis of the deflection shows that these ions deflected at an angle of 20.0°. Under the same electric field, an unknown gaseous ion X+ is deflected at an angle of 5.08°. What is the atomic number of X? A 34 B 45 C 46 D 79

3 2017 TJC H2 Chemistry Prelim