MJC H1 CHEM P1 Answer Key

1 [Turn Over Class Reg Number Candidate’s Name: ___________________________ MERIDIAN JUNIOR COLLEGE JC 2 Preliminary Examination Higher 1 ________________________________________________________________________ Chemistry 8872/01 23 September 2015 Paper 1 Multiple Choice 50 minutes Additional Materials: OMR Sheet and Data Booklet ________________________________________________________________________ READ THESE INSTRUCTIONS FIRST This booklet contains Section A of your paper. Write your name, class and register number in the spaces provided at the top of this page. There are thirty questions in this section. Answer all questions. For each question, there are four possible answers labelled A, B, C and D. Choose the one you consider correct and record your choice in soft pencil on the OMR answer sheet. Read very carefully the instructions on the use of OMR answer sheet. You are advised to fill in the OMR Answer Sheet as you go along; no additional time will be given for the transfer of answers once the examination has ended. This document consists of 12 printed pages (including this cover page). Use of OMR Answer Sheet Ensure you have written your name, class register number and class on the OMR Answer Sheet. Use a 2B pencil to shade your answers on the OMR sheet ; erase any mistakes cleanly. Multiple shaded answers to a question will not be accepted. For shading of class register number on the OMR sheet, please follow the given examples: If your register number is 1, then shade 01 in the index number column. If your register number is 21, then shade 21 in the index number column.

2 [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 Iron poisoning in pregnant woman is usually caused by excessive in take of iron supplement pills. The amount of iron which will cause poisoning depends on the weight of the pregnant woman. It was found that as little as 325 mg of Fe 2+ can be fatal to a 70 kg pregnant woman. How many 325 mg FeSO 4 pills would it take to cause a fatal effect on a 50 kg pregnant woman? A 1 B 2 C 3 D 4 2 One mole of s ulfur dichloride dioxide, SO 2Cl2, reacts with water to give a mixture of sulfuric acid and hydrochloric acid. How many moles of barium hydroxide, Ba(OH)2, would be needed to exactly neutralise the resulting solution formed? A 1 B 2 C 3 D 4 3 Which one of the following statements is not true with regards to the reaction below? Cu2O(s) + H2SO4(aq)  Cu(s) + CuSO4(aq) + H2O(l) A The oxidation number of Cu in Cu2O is +1. B This is a disproportionation reaction. C H2SO4 is an oxidising agent. D Cu2O is a reducing agent. 4 The successive ionisation energies (IE) of two elements X and Y, are given below: IE / kJ mol–1 1st 2nd 3rd 4th 5th 6th 7th 8th X 786 1580 3230 4360 16000 20000 23600 29100 Y 1300 3380 5310 7460 8670 9330 22060 27070 What compound is most likely to be formed when X and Y are combined? A ionic, with formula X2Y B ionic, with formula XY2 C covalent, with formula XY2 D covalent, with formula X2Y

3 [Turn Over 5 Which of the following electrostatic attraction is present in a sample of CH3F? A van der Waals’ forces B ionic bonds C hydrogen bonds D dative bonds 6 In which pair of molecules is the permanent dipole in molecule I greater than that in molecule II? I II A CH3CH2CH2Cl CH3CH2CHCl2 B CH3CH2CH2OH CH3CH2CH2SH C BCl3 NH3 D H2S H2O 7 The heat liberated from the reaction between a strong base Ca(OH)2 and a strong acid HCl is –114 kJ mol–1. Ca(OH)2 + 2HCl  CaCl2 + 2H2O What is the most likely value for the heat liberated when a strong base Ba(OH)2 reacts with a weak acid CH3CO2H in the following reaction? Ba(OH)2 + 2CH3CO2H  (CH3CO2)2Ba + 2H2O A –53 kJ mol–1 B –57 kJ mol–1 C –106 kJ mol–1 D –114 kJ mol–1 8 The standard enthalpy change of formation of H 2O(l) is –394 kJ mol –1 and the standard enthalpy change of formation of CO2(g) is –289 kJ mol–1. If the standard enthalpy change of combustion of propanone is –1780 kJ mol–1, what is the standard enthalpy change of formation of propanone in kJ mol–1? A –1675 B –1465 C –269 D +269

4 [Turn Over 9 Consider the following equilibrium reaction in a closed vessel: CaCO3(s) CaO(s) + CO2(g) H = +178 kJ mol─1 At 800 oC, the value of the equilibrium constant is 0.236. Which one of the following statements is not true about the equilibrium? A The position of the equilibrium shifts to the left when temperature is decreased. B The position of the equilibrium shifts to the right when pressure is decreased. C The value of the equilibrium constant increases with increasing temperature. D The value of the equilibrium constant decreases when less CaCO3 is used. 10 Two experiments were performed involving the following equilibrium. H2(g) + I2(g) 2HI(g) H = +54 kJ mol–1 In experiment I carried out at temperature T1 K, the equilibrium constant, Kc = 64. In experiment II carried out at temperature T2 K, equal volume of H 2 and I2 were initially added into a 1 dm 3 flask. The flask was found to contain 0.2 mol of I2 and 1.6 mol of HI at equilibrium. What is the relationship between T1 and T2? A T1 = T2 B T1 > T2 C T1 < T2 D The relationship cannot be determined. 11 The base dissociation constant, Kb, of ethylamine, CH3CH2NH2, is higher than that of ammonia, NH3. Which of the following statement is true? A The dissociation of ammonia in water is more than that of ethylamine. B The conjugate acid of ethylamine is weaker than that of ammonia. C The concentration of OH– is greater in a solution of ammonia. D The pKb of ethylamine is higher than that of ammonia.

5 [Turn Over 12 Ethanoic acid is a weak acid that has many uses. Which graph best represents the change in pH that occurs when a sample of ethanoic acid is titrated with KOH(aq)? A B C D 13 The following reaction is first order with respect to X and zero order with respect to Y. X + Y  Z Which of the following graph obtained is not correct? A B rate rate [X] [Y] C D [X] [Y] time time pH 7 Volume of KOH / cm3 pH 7 Volume of KOH / cm3 )I 7 Volume of KOH / cm3 pH 7 Volume of KOH / cm3

6 [Turn Over 14 Iodine is formed from the radioactive decay of tellurium -127. This radioactive decay is first-order reaction with a half-life of 9.35 hours. How long will it take for a pure tellurium -127 sample to reach the tellurium to iodine molar proportion of 1:7? A 4.675 h B 9.350 h C 18.70 h D 28.05 h 15 The following graph shows a property of the elements sodium to chlorine. What is the property? A electrical conductivity B first ionisation energy C ionic radius D melting point 16 An oxide and a chloride of the elements in the third period of Periodic Table are dissolved in water separately. One of the solutions can be used to dissolve SO 2 but both of the solutions can be used to dissolve Al2O3. Which of the following could be the oxide and chloride used? A Na2O PCl5 B MgO NaCl C P4O10 SiCl4 D SiO2 MgCl2 Na Mg Al Si P S Cl

7 [Turn Over CH3 CH3 Cl 17 The following structures belong to part of the aliphatic isoethyl ester homologous series. What is the general formula of this series? A Cn+3H2n+6O2 B Cn+2H2n+5O2 C Cn+3H2n+4O2 D Cn+2H2n+3O2 18 Compound X has the following structure: CH3CH=CHCH2CH=CHCH2CH3 What is the total number of cis-trans isome