NYJC H1 Chem Prelim 2012 P1

H1 Chemistry 8872/01 NYJC J2/12 PX NANYANG JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 1 CHEMISTRY 8872/01 Paper 1 Multiple Choice 21 September 2012 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 tutor’s name on the Answer Sheet in the spaces provided unless this has been done for you. 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. This document consists of 15 printed pages and 1 blank page. [Turn over

2 H1 Chemistry 8872/01 NYJC J2/12 PX Section A For each question there are four possible answers, A, B, C and D. Choose the one you consider to be correct. 1 Carbon disulfide, CS 2, is a poisonous, volatile liquid used in the manufacture of viscose rayon and cellophane. It reacts with n itrogen monoxide, NO, to form a yellow solid and equal volumes of two gases. What are the products of the reaction? A S, CO, N2 B S, CO, NO2 C S, CO2, N2 D S, CO2, NO2 2 Dilute sulfuric acid was added to aqueous barium hydroxide until the acid was in excess. Which graph shows the variation in the total number of aqueous ions in solution? A B C D 0 amount of acid added Total number of ions 0 amount of acid added Total number of ions 0 amount of acid added Total number of ions 0 amount of acid added Total number of ions

3 H1 Chemistry 8872/01 NYJC J2/12 PX [Turn over 3 What is the electronic configuration of an element with a second ionisation energy that is lower than that of each of the elements either side of it in the Periodic Table? 0 A 1s22s22p3 1 B 1s22s22p4 2 C 1s22s22p5 3 D 1s22s22p6 4 Copper and iodine are both shiny crystalline solids. The crystal structures of copper and iodine are both face -centred cubic. The diagram shows the arrangement of the particles in this type of crystal lattice. What are the particles present in each lattice? 5 What is a property of a solution of dry hydrogen chloride in dry methylbenzene? A It has a pH less than 7. B It is a non-conductor of electricity. C It reacts with magnesium to give hydrogen. D It reacts with anhydrous sodium carbonate to give carbon dioxide. copper iodine A atoms anions B atoms atoms C cations atoms D cations molecules

4 H1 Chemistry 8872/01 NYJC J2/12 PX 6 Which equation is used to define the first ionisation energy of bromine? A Br(g) → Br−(g) − e− B Br(g) → Br+(g) + e− C ½Br2(g) → Br−(g) − e− D ½Br2(g) → Br+(g) + e− 7 The conversion of diamond into graphite is exothermic by 2 kJ mol −1. Diamond does not readily change into graphite. Which reaction pathway correctly represents this conversion?

5 H1 Chemistry 8872/01 NYJC J2/12 PX [Turn over 8 The iodide-catalysed decomposition of hydrogen peroxide proceeds by the two - stage process shown. H2O2 + I− → IO− + H2O H2O2 + IO− → I− + H2O + O2 Which of the following statements is incorrect? A The overall reaction equation is 2H2O2 → 2H2O + O2. B The rate equation is rate = k[H2O2][I–]. C An increase in temperature will increase the total volume of oxygen gas produced. D The rate constant, k, has a different value if iodide ions are absent. 9 For a gaseous reaction 2X(g) + Y(g) → Z(g), the rate equation is: rate = k[X]2[Y]0 If the pressure in the reaction vessel is doubled, but the temperature remains constant, by what factor does the rate of reaction increase? A 2 B 3 C 4 D 8 time [H2O2] / mol dm−3 0 [I–] = 0.10 mol dm−3 catalyst [I–] = 0.20 mol dm−3 catalyst 0.10 0.50 0.25 5 10 15 20 0.75

6 H1 Chemistry 8872/01 NYJC J2/12 PX 10 The equation for a reversible reaction used in industry to convert methane to hydrogen gas is shown below. CH4(g) + H2O(l) CO(g) + 3H2(g) Which of the following statement s is correct about this reaction when equilibrium has been reached? A The concentrations of methane and carbon monoxide are equal. B The rate of the forward reaction is greater than the rate of the reverse reaction. C The amount of hydrogen is three times the amount of methane. D The value of ΔH for the reverse reaction is + 210 kJ mol−1. 11 The equation for a reaction used in the manufacture of nitric acid is 4NH3(g) + 5O2(g) 4NO(g) + 6H2O(l) Which changes occur when the temperature of the reaction is increased? Position of equilibrium Value of Kc A shifts to left increases B shifts to left decreases C shifts to right increases D shifts to right decreases ΔH = − 900 kJ mol−1 ΔH = −210 kJ mol−1

7 H1 Chemistry 8872/01 NYJC J2/12 PX [Turn over 12 A 1 mol sample of ethanoic acid is diluted at constant temperature to a volume V. Which diagram shows how the pH of the sample varies with V? A B C D 13 The table shows some data on two acid-base indicators. Indicator Approximate pH range Colour change acid alkali bromocresol green phenol red 3.8 – 5.5 6.8 – 8.5 yellow yellow blue red What conclusion can be drawn about a solution in which bromocresol green is blue and phenol red is yellow? A It is weakly acidic. B It is neutral. C It is weakly alkaline. D It is strongly alkaline. 0 V pH 7 0 V pH 0 V pH 7 7 0 V pH 7

8 H1 Chemistry 8872/01 NYJC J2/12 PX 14 Fruit juices and fizzy drinks such as lemonade are often sold in aluminium cans. What is the most important reason why aluminium is a suitable metal? A Aluminium can be recycled. B Aluminium has a very low density. C Aluminium is resistant to corrosion by acids. D Aluminium is the most abundant metal in the Earth’s crust. 15 A mixture of the oxides of two elements of the third period is dissolved in water. The solution is approximately neutral. What could be the constituents of the mixture? A Al2O3 and SO2 B Na2O and MgO C Na2O and P4O10 D SO3 and P4O10 16 Deuterium, D, is a heavy isotope of hydrogen. De uteriobenzene is reacted with bromine and iron fi lings under controlled conditions, so that only monobromination takes place. Assuming that the carbon -deuterium bond is broken as easily as a carbon - hydrogen bond, which proportion of the brominated products will be 2-bromodeuteriobenzene? Br DD deuteriobenzene 2-bromodeuteriobenzene A 16% B 20% C 33% D 45%

9 H1 Chemistry 8872/01 NYJC J2/12 PX [Turn over 17 Low fat sunflower spreads which are high in polyunsaturates contain esters of linoleic acid. CH3(CH2)4CH=CHCH2CH=CH(CH2)7CO2H linoleic acid On the lid of a brand of spread it is claimed that the spread contains virtually no trans fatty acids. Which isomer does not contain a trans linkage and could be present in the spread? A B C D

10 H1 Chemistry 8872/01 NYJC J2/12 PX 18 A sample of 1,4-diethylbenzene was treated with hot, concentrated alkaline KMnO4. What compound could be formed? A CH2COOH CH2COOH C COOH COOH B CH2COO− CH2COO− D COO− COO− 19 Aqueous silver nitrate was added at the same time to separate solutions of chloroethane and iodoethane. The first signs of a reaction were in the sample containing io