2023 ASRJC H2 Chem Prelim P1 QP

ASRJC JC2 PRELIMS 2023 9729/01/H2 [Turn over ANDERSON SERANGOON JUNIOR COLLEGE 2023 JC2 PRELIMINARY EXAMINATION NAME:______________________________ ( ) CLASS: 23 /____ CHEMISTRY 9729/01 Paper 1 Multiple Choice 21 September 2023 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. Write your name, class and register number on the Answer Sheet. 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 14 printed pages and 2 blank pages. Multiple Choice Answer Sheet Write your name, class and NRIC / FIN number, including the reference letter. Shade the NRIC / FIN number. Exam Title: JC2 PRELIM Exam Details: H2 Chemistry / Paper 1 Date: 21/09/2023

2 ASRJC JC2 PRELIMS 2023 9729/01/H2 1 In which species are the number of protons, neutrons and electrons all different? A 27 13 Al B 35 17 Cl – C 32 16 S2– D 39 19 K+ 2 The ionisation energies, IE, of five elements are given in the table. second IE /kJ mol-1 third IE /kJ mol-1 fourth IE /kJ mol-1 B F Na Mg Al 2420 3370 4560 1450 1820 3660 6040 6940 7740 2740 25000 8410 9540 10500 11600 Which statement is correct? A The 2nd IE of F is higher than the 3 rd IE of Al because Al2+ has a higher nuclear charge than F+. B The 2nd IE of Mg is lower than 2nd IE of Na because there is inter -electronic repulsion between the paired electrons in Mg+. C The 4th IE of B is higher than the 4 th IE of Al because the electron to be removed from Al3+ is further away from the nucleus. D The successive IE of these elements increase because the shielding effect increases. 3 Which statement about the electrons in a ground state germanium atom is correct? A Electrons are present in four different energy levels. B There are more electrons in d orbitals than there are in p orbitals. C The occupied orbital of highest energy is spherical. D The occupied orbital of lowest energy is spherical.

3 ASRJC JC2 PRELIMS 2023 9729/01/H2 [Turn over 4 Which species contains three π bonds? 1 Al2Cl6 2 SO3 3 CH3CH2COOH 4 CH2CHCH2CN A 2 and 3 B 2 and 4 C 1 only D 2 only 5 The shape and polarity of four molecules are shown in the following table. Which row is correct? molecule molecular shape polarity A B C D beryllium chloride phosphorus trichloride carbon dioxide tribromomethane bent trigonal pyramidal linear tetrahedral non-polar non-polar polar polar 6 Water, methanol and sulfur dioxide have similarly shaped molecules. O H H O H CH3 S O O What is the strongest intermolecular force in water, methanol and sulfur dioxide? H2O CH3OH SO2 A B C D hydrogen bonds hydrogen bonds permanent dipoles hydrogen bonds hydrogen bonds hydrogen bonds permanent dipoles permanent dipoles permanent dipoles induced dipoles induced dipoles induced dipoles

4 ASRJC JC2 PRELIMS 2023 9729/01/H2 7 Which graph correctly describes the behaviour of two ideal gases P and Q, both having the same mass, where P has a larger Mr than Q? A B C D 8 Which gas shows the greatest deviation from ideality? A CH4 B SO3 C C2H2 D CO2 9 When 25 cm3 of 0.5 mol dm−3 hydrochloric acid is reacted with an equal volume of 0.5 mol dm−3 potassium hydroxide, the temperature of the mixture rose by 3.4 oC. What will be the temperature change if 50 cm3 of 1 mol dm−3 hydrochloric acid is mixed with an equal volume of 1 mol dm−3 potassium hydroxide? A 1.7 oC B 3.4 oC C 6.8 oC D 13.6 oC 10 Which equation corresponds to the enthalpy change stated? A H2SO4(aq) + 2KOH(aq) → K2SO4(aq) + 2H2O(l) ∆Hneutralisation Ɵ B Na+(s) + aq → Na+(aq) ∆Hhydration Ɵ (Na+) C Al2O3(s) → 2Al3+(g) + 3O2−(g) ∆Hlattice energy Ɵ (Al2O3) D O2(g) → 2O(g) 2∆Hatomisation Ɵ (O2) T / oC p Q P T / oC p Q P p V pV constant T Q P p pV constant T P Q constant V constant V

5 ASRJC JC2 PRELIMS 2023 9729/01/H2 [Turn over 11 Given the following data in kJ mol‒1 enthalpy change of atomisation of Na(s) +109 electron affinity of Cl atom ‒364 enthalpy change of formation of NaCl(s) ‒411 enthalpy change of atomisation of Cl(g) +121 1st ionisation energy of Na atom +494 What is the lattice energy of NaCl(s) in kJ mol‒1? A ‒771 B ‒892 C ‒1269 D ‒1499 12 The equation describes the equilibrium between solid silver chromate and its aqueous ions. Ag2CrO4(s) ⇌ 2Ag+(aq) + CrO42−(aq) Ho = +61 kJ mol−1 So = −30 J K−1 mol−1 What can be deduced from the information about this equilibrium? 1 At 25 oC, Go is negative. 2 At 25 oC, silver chromate is insoluble in water. 3 At 95 oC, silver chromate is more soluble in water than at 25 oC. A 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

6 ASRJC JC2 PRELIMS 2023 9729/01/H2 13 Use of the Data Booklet is relevant to this question. Bronze is an alloy of copper and tin. The following information is obtained for a sample of bronze. mass number 63 65 118 % composition f 68 – f 32 Naturally occurring copper contains only two isotopes, 63Cu and 65Cu. Given the ratio of 63Cu and 65Cu in naturally occurring copper is the same as that in bronze, what is the value of f? A 17 B 25 C 51 D 75 14 Two reactions are shown. Reaction 1 X2(g) + Y2(g) 2XY(g) Reaction 2 XY(g) ½ X2(g) + ½ Y2(g) The equilibrium constant, Kp, for Reaction 1 is 0.0052. What is the value of Kp for Reaction 2? A 2.6 x 10–3 B 13.9 C 192.3 D 384.6

7 ASRJC JC2 PRELIMS 2023 9729/01/H2 [Turn over 15 Methanol, CH3OH, can be produced industrially by reacting CO with H2. CO(g) + 2H2(g) CH3OH(g) H = –91 kJmol–1 The process can be carried out at 4 x 103 kPa and 1150K. Which statements of about this reaction are correct? 1 Increasing the temperature will increase the rate of reaction because more frequent effective collisions will occur. 2 Lowering the temperature will reduce the rate of reaction because the forward reaction is exothermic. 3 Increasing the pressure will reduce the rate of reaction because there are a larger number of moles on the left-hand side of the equation. A 1 only B 1 and 2 C 1 and 3 D 2 and 3 16 The decomposition of HI is a second order reaction. Which graph correctly describes the kinetics of this reaction? A [H2O2] time B rate time C rate [H2O2] D rate [H2O2] [HI] [HI]2 [HI]

8 ASRJC JC2 PRELIMS 2023 9729/01/H2 17 Sucrose has been used as a feedstock in the production of alcohol for use as a motor fuel. The initial reaction is its hydrolysis: C12H22O11 + H2O C6H12O6 + C6H12O6 sucrose glucose fructose This reaction can be catalysed either by dilute acid or by an enzyme which occurs in yeast. The following results were obtained using hydrochloric acid as the catalyst.