CJC 2019 Promo Paper 1 3 QP

[Turn over 9729/CJC JC1 Promotional Exam 2019 CANDIDATE NAME CLASS 1T CHEMISTRY 9729/01 & 03 Paper 1 Multiple Choice (30 minutes) Wednesday 2 October 2019 Paper 3 Free Response (1 hour) 1 hour 30 minutes Additional Materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Do not use staples, paper clips, glue or correction fluid. Write and/or shade your name, NRIC / FIN number and class on the Multiple Choice Answer Sheet in the spaces provided. For Paper 1, there are fifteen questions. 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 Multiple Choice 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. Multiple Choice Answer Sheet will be collected after the first 30 minutes. For Paper 3, write your answers using the writing papers provided. Write in dark blue or black pen on both sides of the paper. Start each question on a fresh sheet of paper. You may use an HB pencil for any diagrams or graphs. The use of an approved scientific calculator is expected, where appropriate. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. This document consists of 11 printed pages and 1 blank page. Catholic Junior College JC1 Promotional Examinations Higher 2

2 [Turn over 9729/CJC JC1 Promotional Exam 2019 Paper 1 1 Which of the following statements is not true? A One mole of water contains 2 moles of hydrogen atoms. B One mole of chlorine gas contains 6.02 x 1023 chlorine atoms. C One mole of ammonia has a mass of 17.0 g. D One mole of sodium chloride contains 1.204 x 1024 ions. 2 In an experiment, 2 moles of an aqueous metallic salt reacted exactly with 1 mole of aqueous sodium sulfite, Na2SO3. The half-equation for oxidation of sulfite ion, SO32- is shown below. SO32– (aq) + H2O(l) → SO42–(aq) + 2H+(aq) + 2e– If the original oxidation number of the metal in the salt was +5, what would be the new oxidation number of the metal? A +1 B +2 C +3 D +4 3 The first five successive ionisation energies of an element, W, found in Period 3, are as follows: 577, 1820, 2740, 11600, 14800 kJ mol–1 Which statements are consistent with these data? 1 The outer electronic configuration of an atom of W is 3s23p1. 2 There is a large increase between the 3 rd and the 4th ionisation energy because the 4th electron is from an inner principal quantum shell. 3 W forms a chloride with a formula WCl4. A 1 and 2 only B 2 and 3 only C 1, 2 and 3 D 1 only 4 The Valence Shell Electron Pair Repulsion (VSEPR) theory is used to predict the shapes of molecules. Which shape is correctly predicted by VSEPR theory? Number of bonded electron pairs around central atom Number of lone pairs around central atom Shape A 2 1 linear B 2 1 trigonal planar C 3 1 tetrahedral D 3 1 trigonal pyramidal

3 [Turn over 9729/CJC JC1 Promotional Exam 2019 5 In 1985, a molecular form of carbon, C 60, called buckminsterfullerene, was discovered in the products formed when graphite was vapourised. It exhibits some properties similar to graphite. The structure proposed for the molecule is a roughly spherical collection of atoms in the shape of hexagons and pentagons, very much like a soccer ball. Which one of the following properties is expected of buckminsterfullerene? 1 It burns completely in oxygen to give carbon dioxide gas only. 2 It has a lower melting point compared to graphite. 3 It dissolves in water. A 1 only B 2 only C 1 and 2 only D 1, 2 and 3 only 6 Gases such as helium behave ideally under conditions of high temperature and low pressure. Which of the following gases are very likely to behave ideally under the same conditions? 1 ammonia, NH3 2 hydrogen, H2 3 nitrogen, N2 A 3 only B 1 and 2 only C 2 and 3 only D 1 and 3 only

4 [Turn over 9729/CJC JC1 Promotional Exam 2019 7 A student used the apparatus below to heat a can containing 300 g of water. The following data were recorded: Mass of propan-1-ol burnt = m g Change in temperature of water = ΔT oC You are given that: Relative molecular mass of propan-1-ol = 60.0 Specific heat capacity of water = c J g–1 K–1 What is the enthalpy change of combustion, in kJ mol–1, given that the process is 100 % efficient? 8 Instant heat packs comprise a supersaturated solution of sodium ethanoate and a small flat disc of iron metal embedded in the solution. Pressing the disc will cause the following reaction to occur: CH3CO2Na(aq) + 3H2O(l) → CH3CO2Na.3H2O(s) Which of the following reflects the correct signs of ∆H, ∆S and ∆G for the overall process of the reaction? ∆H ∆S ∆G A + – + B + + – C – + – D – – – A − m × c × ∆T × 60 300 C − 300 × c × ∆T × 60 1000 × m B − m × c × ∆T × 60 1000 × 300 D − 300 × c × (∆T + 273) × 60 1000 × m thermometer can containing 300 g of water burner containing propan-1-ol

5 [Turn over 9729/CJC JC1 Promotional Exam 2019 9 Acrylonitrile, CH 2=CHCN, is one of the toxic and cancer -causing chemicals that was illegally dumped into a river in Pasir Gudang in March 2019. CH2=CHCN is formed industrially in the following reaction: CH2=CHCH3 (g) + NH3 (g) + 3 2 O2 (g) CH2=CHCN (g) + 3H2O (g) ΔH = −519 kJ mol–1 Which of the following changes would increase the equilibrium constant, Kp? A adding a suitable catalyst B increasing the amount of NH3 added C increasing the pressure D decreasing the temperature 10 The synthesis of ammonia gas by the Haber process is an important industrial method which leads to the production of artificial fertilisers for use in the cultivation of crops. The equilibrium reaction of the Haber Process is shown below. N2(g) + 3H2(g) 2NH3(g) Which of the following statements is true when the above equilibrium is subjected to a decrease in pressure? 1 The yield of NH3 increases. 2 The amounts of N2 and H2 increase. 3 The value of Kc changes. A 1 only B 1 and 2 only C 2 only D 2 and 3 only 11 The rate of decomposition of acidified hydrogen peroxide is found to be first order with respect to the concentration of hydrogen peroxide. Which graph correctly shows how the reaction rate changes with [H2O2]? A C B D [H2O2] 0 rate rate [H2O2] 0 rate [H2O2] 0 rate [H2O2] 0

6 [Turn over 9729/CJC JC1 Promotional Exam 2019 12 Constitutional (structural) isomers are compounds with the same molecular formula but different arrangement of atoms. How many constitutional isomers with molecular formula C3H6Br2 are there? A 2 B 3 C 4 D 5 13 The given diagram shows the structure of citronellol, which is used in perfumes and insect repellents. What are the functional groups present in citronellol? 1 alkene 2 alcohol 3 carboxylic acid A 1 only B 1 and 2 only C 2 and 3 only D 1, 2 and 3 14 A catalytic converter is fitted into the exhaust system of a car for the purpose of removing toxic gases. Surfaces in a catalytic converter are coated with platinum and rhodium catalyst. Which of the following reaction occurs in a catalytic converter? A CO2 + NO → CO + NO2 B 2CO + 2NO → 2CO2 + N2 C 2SO2 + 2NO → 2SO3 + N2 D C8H18 + 17 2 O2 → 8CO + 9H2O

7 [Turn over 9729/CJC JC1 Promotional Exam 2019 15 1-m