2024 MI PU3 MYE P1 (student)

Class Adm No Candidate Name: This question paper consists of 13 printed pages and 1 blank page. 2024 Mid-Year Examination Pre-University 3 H2 CHEMISTRY 9729/01 Paper 1 Multiple Choice 8 Jul 2024 1 hour Additional materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Do not turn over this question paper until you are told to do so Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class and admission number in the spaces provided at the top of this page and on the Multiple Choice Answer Sheet provided. 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 Multiple Choice Answer Sheet provided. 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 question paper. The use of an approved scientific calculator is expected, where appropriate. FOR EXAMINER’S USE TOTAL (30 marks)

2 1 Use of the Data Booklet is relevant to this question. Which of the following options contain the same number of molecules as one another? 1 750 cm3 of carbon dioxide gas (measured at r.t.p.) 2 1.00 g of oxygen gas 3 1.90 cm3 of ethanol where the density of ethanol is 0.80 g cm–3 A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3 2 10 cm 3 of a hydrocarbon was burnt in 1 50 cm 3 of oxygen. The resultant gaseous mixture contracted by 30 cm3 when passed through a solution of aqueous sodium hydroxide. The remaining gas was just sufficient to burn exactly 20 cm3 of the same hydrocarbon. Given that all gas volumes were measured at room temperature and pressure , what is the formula of the hydrocarbon? A C2H6 B C3H4 C C3H6 D C3H8 3 Which of the following statements describe the reaction below correctly? 2PCl5 ⇌ PCl4+ + PCl6– 1 PCl4+/ PCl6– is a conjugate acid-base pair. 2 PCl5 is both a Lewis acid and Lewis base. 3 PCl5 is both an Arrhenius acid and Arrhenius base. A 2 only B 3 only C 1 and 2 only D 1 and 3 only 4 The table belows shows the fifth, sixth, seventh and eighth ionisation energies of an element in the third period. 5th 6th 7th 8th ionisation energy / kJ mol-1 7000 8500 27110 31720 Which is the identity of the element? A P B S C Cl D Ar

3 [Turn over 5 Which of the following options are correct? molecule shape polarity 1 BeCl2 bent non-polar 2 NO2 bent polar 3 SO3 trigonal planar non-polar A 1 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3 6 Which of the following compounds is expected to have the greatest degree of covalent character? A CaO B CaS C MgO D MgS 7 10 cm3 of a volatile liquid E turns into 0.050 dm3 of vapour at 50 °C and 1 bar. E is known to have an Mr of 𝑦. What is the density of liquid E, in g cm-3? A 100000 × 0.050 × 10-3 × 𝑦 8.31 × 323 × 10 B 100000 × 0.050 × 10-3 8.31 × 323 × 10 × 𝑦 C 100000 × 0.050 × 10-6 × 𝑦 8.31 × 323 × 10 D 100000 × 0.050 × 10-6 × 10 8.31 × 273 × 𝑦

4 8 Three identical flasks each contain the same mass of gases G1, G2 and G3 respectively. The temperature and pressure of each flask are as follows: G1 G2 G3 temperature / K T T 2T pressure / Pa p 2p p Assuming ideal gas behaviour, which of the following is a correct representation of the relative molecular masses of the three gases? A G1 < G3 < G2 B G2 < G1 < G3 C G2 < G3 < G1 D G3 < G1 < G2 9 Which of the following reactions is non-spontaneous at all temperatures? A J(s)  K(s) + 2L(g) ΔH > 0 B 3M(g) + 2N(g)  4O(g) ΔH < 0 C P(g)  2Q(g) ΔH < 0 D R(g) + S(g)  T(g) ΔH > 0 10 Hess’ Law can be used to determine the average C–H bond energy in CH4(g). What information is necessary to perform the calculation? A ΔHformation(CH4(g)) only B ΔHformation(CH4(g)), ΔHatomisation(H2(g)), ΔHatomisation(C(s)) C ΔHformation(CH4(g)), ΔHatomisation(H2(g)), Bond Energy (C–C) D ΔHcombustion(CH4(g)), ΔHcombustion(C(s)), ΔHcombustion(H2(g))

5 [Turn over 11 Nepetalactone is the active ingredient found in catnip. nepetalactone Which product is formed from an electrophilic addition reaction with nepetalactone? A B C D 12 Vasopressin is a mammalian hormone released from the pituitary gland of the body. It is a protein made up of many amino acids, two of which have formed a S–S covalent bond. vasopressin Which statements about vasopressin are correct? 1 Vasopressin is made of 9 amino acid subunits. 2 There are eight chiral carbons in vasopressin. 3 Only two of the amino acids that make up vasopressin have side-chains containing O. A 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

6 13 Which set of reagents will produce phenyl propanoate under suitable conditions? A B C D 14 Gel electrophoresis is a technique used to identify amino acids obtained from peptide hydrolysis. The sample is loaded onto the middle of the gel and placed across a potential difference. The following tripeptide, Lys-Gly-Asp, was completely hydrolysed using acid, then buffered to pH 7 at 25 °C. Lys Gly Asp The following results were obtained: At which position on the gel would the spot for Lys be formed? Asp Gly A B C D

7 [Turn over 15 Which of the following molecules can exhibit cis-trans isomerism? 1 2 3 A 3 only B 1 and 2 only C 1 and 3 only D 1, 2 and 3 16 Compounds U and V have the following structures. U V Which reagents and conditions can be used to distinguish them? 1 ethanolic AgNO3, warm 2 K2Cr2O7, warm 3 Fehling’s reagent, warm A 2 only B 3 only C 1 and 2 only D 2 and 3 only

8 17 The kinetics of a reaction was investigated, and the following results obtained: 2W + X → Y + 2Z run [W] / mol dm-3 [X] / mol dm-3 initial rate / mol dm-3 s-1 1 0.020 0.015 6.40 × 10−3 2 0.020 0.030 2.56 × 10−2 3 0.030 0.030 3.84 × 10−2 What is the numerical value of the rate constant for this reaction? A 0.213 B 0.320 C 21.3 D 1420 18 A solution of acidified potassium manganate(VII) was added to ethanedioate ions, C 2O42–, and the reaction is as follows: 2MnO4–(aq) + 5C2O42–(aq) + 16H+(aq) → 2Mn2+(aq) + 10CO2(g) + 8H2O(l) It is known that Mn2+ catalyses the above reaction. Which of the following graphs best describes the reaction? A B C D rate [C2O42–] [C2O42–] [C2O42–] rate rate time time

9 [Turn over 19 The Haber process is used in the industrial production of ammonia. N2(g) + 3H2(g) ⇌ 2NH3(g) ΔH < 0 Which of the following options show a correct operating condition with its rationale? operating condition rationale 1 450 °C high temperature increases rate of reaction 2 450 atm high pressure shifts position of equilibrium to the right 3 finely-divided Fe lowers activation energy to increase rate of reaction A 3 only B 1 and 2 only C 1 and 3 only D 1, 2 and 3 20 Sulfuric acid can be produced from the Contact process, which involves an equilibrium reaction to produce sulfur trioxide, SO3. 2SO2(g) + O2(g) ⇌ 2SO3(g) Kc = 280 mol-1 dm3 What is the amount of O2 used to react with 0.80 mol of SO2 initially, given that 0.60 mol of SO3 is obtained at equilibrium in a 1