RVHS Prelim P1 QP

River Valley High School 9647/01/PRELIM/15 2015 Preliminary Examination II RIVER VALLEY HIGH SCHOOL YEAR 6 PRELIMINARY EXAMINATION (II) CANDIDATE NAME CLASS 6 CENTRE NUMBER S INDEX NUMBER H2 CHEMISTRY 9647/01 Paper 1 Multiple Choice 25 September 2015 1 hour Additional Materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class, centre number and index number on the Answer Sheet in the spaces provided. There are forty 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. This document consists of 15 printed pages and 1 blank page.

2 River Valley High School 9647/01/PRELIM/15 2015 Preliminary Examination II Section A For each question there are four possible answers, A, B, C, and D. Choose the one you consider to be correct. 1 At 35 C and 1 atm, ozone (O3) reacts with water to give hydrogen and oxygen gas. O3(g) + H2O(l)  H2(g) + 2O2(g) Given that gases expand by 14.3 % when heated from standard temperature to 35 C, calculate the volume of gas collected when 0.15 g of water is required to fully react with a sample of ozone at 35 C? A 560 cm3 B 600 cm3 C 640 cm3 D 800 cm3 2 Radioactive decay is the process where an unstable atom loses energy by emitting radiation. 14C is an isotope of carbon that has a tendency to lose energy by undergoing -decay, where a neutron changes into a proton and an electron. What is the product after 14C undergoes -decay? A 13C B 14C C 13N D 14N 3 Which of the following is true when SO2 is changed to SO3 2? Total number of electrons around S Bond angle A Increases from 10 to 12 Increases from 107 to 120 B Increases from 10 to 14 Decreases from 180 to 120 C Remains the same Decreases from 120 to 107 D Remains the same Decreases from 180 to 120 4 When one mole of water is formed from the reaction between solid Ba(OH) 2 and HNO3, 58.4 kJ of heat is released. Calculate the final temperature of the solution when 2.56 g of solid Ba(OH) 2 is added to 200 cm3 of 0.500 mol dm3 HNO3 at room temperature? A 22.6 C B 24.0 C C 26.4 C D 27.1 C

3 River Valley High School 9647/01/PRELIM/15 2015 Preliminary Examination II 7 Two electrode potentials are given: V2+ + 2e ⇌ V E = 1.20 V Zn2+ + 2e ⇌ Zn E = 0.76 V Which species is the strongest reducing agent? A Zn2+ B V2+ C V D Zn 5 Enthalpy changes for the following reactions were determined experimentally: H2(g) + 1 2 O2(g)  H2O(l) H = 282 kJ mol1 CH3CH3(g) + 7 2 O2(g)  2CO2(g) + 3H2O(l) H = 1560 kJ mol1 HCCH(g) + 2H2(g)  CH3CH3(g) H = 302 kJ mol1 What is the enthalpy change of combustion of ethyne, HCCH? A 1298 kJ mol1 B 1580 kJ mol1 C 2144 kJ mol1 D 2426 kJ mol1 6 If the behaviour of an ideal gas is described by the equation pV = nRT, which of the following statements must be true of the gas? A The volume of a given mass of gas is doubled if temperature increases from 25 C to 50 C at constant pressure. B The pressure is doubled when the volume is doubled for a given mass of gas at constant temperature. C The relative molecular mass of the gas is doubled when the pressure of the gas is doubled. D The density of the gas is inversely proportional to the temperature at constant pressure.

4 River Valley High School 9647/01/PRELIM/15 2015 Preliminary Examination II 8 Steel objects are sometimes electroplated with chromium to increase its ability to resist corrosion and to give the object an attractive shine. An object to be chromium plated is immersed in a solution of chromium( III) chloride. After 15 min, the mass of chromium deposited is measured to be 0.47 g. What is the average current used for the electroplating process? A 0.32 A B 0.97 A C 2.9 A D 6.3 A 9 The reaction between an alkyl bromide, P, and sodium hydroxide was studied and the following results were obtained: [P] / mol dm3 [OH] / mol dm3 Initial rate/ mol dm3 s1 0.1 0.1 1.2 × 104 0.1 0.2 2.4 × 104 0.2 0.3 7.2 × 104 What conclusion can be drawn about the reaction? A The reaction is overall 1st order. B The units for rate constant mol dm3 s1. C The value of the rate constant is 0.024. D The reaction proceeds via the SN2 mechanism. 10 14C (half -life of 5500 years) is used in the carbon dating of some archaeological artefacts. A wooden artefact is analysed and its 14C content is measured to be 8 % of the typical initial amount of 14C in trees. What is the age of this wooden artefact? A 16500 years B 17900 years C 20000 years D 22000 years 11 At a total pressure of 1 atm and 20 C, x % of dinitrogen tetraoxide is dissociated according to the following equation: N2O4 ⇌ 2NO If the value of Kp is 24 1 atm, what is the value of x? A 10 B 20 C 30 D 40

5 River Valley High School 9647/01/PRELIM/15 2015 Preliminary Examination II 12 Glycine, or aminoethanoic acid, is dissolved in a buffer solution of pH 9.0. Which one of the following shows the structures of the two main forms of glycine at this pH? A +NH3CH2COOH and NH2CH2COOH B +NH3CH2COOH and NH2CH2COO C +NH3CH2COO and NH2CH2COO D NH2CH2COOH and NH2CH2COO 13 In which of the following series does the value of pKa decrease? A CH3CO2H > CCl3CO2H > C2H5OH > C6H5OH B CCl3CO2H > CH3CO2H > C6H5OH > C2H5OH C C6H5OH > C2H5OH > CH3CO2H > CCl3CO2H D C2H5OH > C6H5OH > CH3CO2H > CCl3CO2H 14 Calcium phosphate is a sparingly soluble salt. Given that the solubility product of calcium phosphate is s, what is the concentration of calcium ions? A 5 1 4 9      s B 5 1 108      s C 5 1 27 8      s D 5 1 4      s 15 Which of the following is true for the Group II element, strontium, or its compounds? A Strontium does not react with steam. B Strontium oxide reacts with both acids and bases. C Strontium chloride dissolves in water to give a weakly acidic solution. D Strontium carbonate decomposes at a higher temperature than calcium carbonate.

6 River Valley High School 9647/01/PRELIM/15 2015 Preliminary Examination II 16 The following graph shows the second ionisation energy of eight consecutive elements. Element J belongs to Period 3 of the Periodic Table. It has a high electrical conductivity and its chloride has a simple molecular structure. With reference to the graph above, which of the options A, B, C or D, corresponds to the second ionisation energy of element J? 17 Chlorine gas was bubbled into a beaker of cold potassium hydroxide solution. Three portions of the resultant mixture were pipetted into 2 conical flasks labelled P and Q. The conical flask P and Q were left in an ice bath and a hot water bath respectively for 10 minutes before excess silver nitrate solution was added. The precipitate formed from each resultant mixture was isolated, dried and weighed. Which of the following statements is incorrect regarding the above experiment? A The mass of precipitate obtained from resultant mixture in Q is five times of that from P. B Potassium chloride and potassium chlorate( V) are present in Q after 10 minutes. C When Q is left in the hot water bath, the oxidation number of chlorine changes from +1 to -1 and from +1