CHM140Y-2010 - NAME (PRINT): Last/Surname First lGiven Name...

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Unformatted text preview: NAME (PRINT): Last/Surname First lGiven Name STUDENT #: SIGNATURE: UNIVERSITY OF TORONTO MISSISSAUGA APRIL 2010 FINAL EXAMINATION CHM140Y5Y The Study of Matter and Its Transformations Thottackad Radhakrishnan Duration - 3 hours Aids: TI-30XIIS or CASIO fx-260 solar The University of Toronto Mississauga and you, as a student, share a commitment to academic integrity. You are reminded that you may be charged with an academic offence for possessing any unauthorized aids during the writing of an exam, including but not limited to any electronic devices with storage, such as cell phones, pagers, personal digital assistants (PDAs), iPods, and MP3 players. Unauthorized calculators and notes are also not permitted. Do not have any of these items in your possession in the area of your desk. Please turn the electronics off and put all unauthorized aids with your belongings at the front of the room before the examination begins. If any of these items are kept with you during the writing of your exam, you may be charged with an academic offence. A typical penalty may cause you to fail the course. Please note, you CANNOT petition to RE—WRlTE an examination once you have begun writing. Notes to Students 1. Enter your name and student number on each page of the examination paper. 2. Answer 8 Questions {out of 9!. Each question counts for 20 marks. 3. in the table below, circle the number of the question you do not want to have marked. If you do not do that. we will only count the marks for the first eight questions for which there is writing. We will not take marks for the best eight questions. 4. Check to make sure there are 10 pages including this cover page. 1'20 1‘20 l20 1’20 120 120 l20 l160 Continued on next page CHIVI140Y5Y April Regutar Exam Page 2 of 10 NAME: Student Number: 1.61. What is the energy'difference in kJmol"1 between the first and second shells of the hydrogen atom if the first emission in the Lyman series occurs at A = 121.57 nm [0 = 3.00 x108 ms”1 ; h = 6626 x10 " 34 J.s; Avogadro’s Number: 6.02 x1023mol”11 b. Balance the following oxidation—reduction reaction in aqueous acidic solution. A5203 4' N03 mum-b- H3A304 '+' N203 Continued on next page CHM‘I40Y5Y April Regular Exam I Page 3 of 10 NAME: Student Number: 2 Give the AXE type formula and draw the 3- dimensional structure of the molecules given. The central atom of the molecule is underlined. Show the lone pair of electrons, if any, on all the atoms. Give the name of the shape of the molecule. Would you expect any of these molecules to have a dipole moment? If so, show the direction of the dipole moment vector, relative to the 3—dimensional diagram you have drawn. (Put your answers in the table below) _ _B_rFs 3.012 (b). 3~dimen510nal structu re (c). name of shape of molecule such as tetrahedral, octahedral etc. (d). ail bond angles (e). the central atom of the molecule uses hybridized orbtals to form 0' bonds. Name the type of hybridization on the central atom such as Spa, dsp3 etc. (f).ls there a net dipole moment vector? If so, show the direction of the vector relative to the diagram in (b) above Continued on next page CHM140Y5Y April Regular Exam Page 4 of 10 NAME: Student Number: 3‘ What volumes of 0.200 M aqueous solution of formic acid, a weak monoprotic acid (KA= 1.78 x 10"“) and 0.200 M aqueous solution of NaOH would you mix to prepare 500 mL ofa buffer solution of pH = 4.0. Explain any simplifying assumptions made. Continued on next page CHM140Y5Y April Regular Exam Page 5 of 10 NAME: Student Number: 4 3 Briefly explain the photoelectric effect? 4.b Give the full ground state electronic configuration of the following ions. (1) Mg” (2) or+3 (3) 0“2 (4) Cu” (5) P” 4.0. An element exists as a diatomic gas at STP. It effused 0.3536 times the rate of effusion of helium under the same conditions. Calculate the molar mass of the element and identify the element.(Atomic mass helium = 4.0026 g mol“) Continued on next page CHM140Y5Y April Regular Exam Page 6 of 10 NAME: Student Number: 5 a. How will you convert ethene (CZH4) to 2—butanone (CH3COCHZCH3). Use only the following reagents for the conversion: Choose the right reagent for each step of the conversion. (Mg/ether; OH"; @2052; H81"; H30*) 5.b. Nitrobenzene reacts with bromine in the presence of ferric bromide. Represent the reaction giving the structure of the reactant and product. Give the name of the type of the reaction. 5.0. Alanine {(HZN) CH (CH3)COOH] and glycine [(HZN)CH2(COOH)} are two amino acids. One of them is optically active while the other is not. Explain. Write the reaction between them to form a dipeptide. Continued on next page CHMMOYSY April Regular Exam Page 7' of 10 NAME: Student Number: 6 a Show how one can determine the AH" and AS" of a reaction at equilibrium by measuring the equilibrium constants of the reaction at two different temperatures. 6 b (1). Calculate the enthalpy change for the reaction C3H8(g) + Cl2(g) M 03H7Cl(g} "1’ HCE(9) The standard enthalpies of formation (kJmoW) are given below 03H3(g) ("1104) ; CaHyckg) (*1 105); HCl(g) ((-1 92) (2) Calculate the C-CI bond energy in CgHyClmgiven that the average bond energies (kJmol‘U are. C—H (412); CW! (242); H—Cl (431) Continued on next page CHM140Y5Y April Regular Exam Page 8 of 10 NAME: Student Number: T.a What is the difference between an electrolytic cell and an electrochemical cell (galvanic cell)? With the help of labeled diagrams describe the working of these two types of cells. 7 b Calculate the standard free—energy change at 25 °C for the following reaction. ZH(S) + CU 2+(aq) "Hm-9' Znflm) + CU(S) Standard reduction potentials at 25 °C are given below Zn” + 2e" “MW—e Zn(s) “1 0.76 V Cu2+ + 2ew ————-——+ Cu(s) +0.84 V [F a 96500 coulombs.moi"11 Continued on next page CHM‘I4OY5Y April Regular Exam Page 9 of 10 NAME: Student Number: 8.a Derive the equations that show that while the half—life for a first»order reaction is independent of the original reactant concentration, the half-life for both zero-order and second-order reactions depends on the original reactant concentration. 8.b The radioisotope 32P decays according to first-order kinetics and has a half~life of 14.3 days. How long does it take for 95% of a sample of 32P to decay? Continued on next page CHMMOYSY April Regular Exam Page 10 of 10 NAME: Student Number: 9 a Calculate the activation energy for the reaction 2N0; "mm—v + 02 The rate constant for the reaction is 2.7 x 10"2 iVi'1s'1 at 227' °C and 2.4 x 'lO"1 lVl“1s'1 at 277 “C (R = 8.314 J moi-"11(1) 9 b What is meant by the elevation of boiling point of a solution? Explain with suitable diagram how it is related to the lowering of vapor pressure of a solution? Equimolal solutions of glucose and sodium chloride do not show the same elevation in boiling point. Explain. Total Marks = 160 ...
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CHM140Y-2010 - NAME (PRINT): Last/Surname First lGiven Name...

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