GENERAL CHEMISTRY CHEM 152
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This 11 page Study Guide was uploaded by Carmela Kilback on Wednesday September 9, 2015. The Study Guide belongs to CHEM 152 at University of Washington taught by Staff in Fall. Since its upload, it has received 52 views. For similar materials see /class/192597/chem-152-university-of-washington in Chemistry at University of Washington.
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Date Created: 09/09/15
A Q 39 AB q w Hui S 1an P AV 1rre W m V kRNa138x103923JK H E PV AS 2 k 1 Q nal 39 k1nQinitial Nk 1nQ nalQini al for N molec AH AE Nk1nV nalVinitial AE PAV P is constant 2 V V nRT qp wtotal AEnCATqV V1 V1 1 V RTl V Vz nRTl 2 AH nCpAT qP n n IVI V1 CV 32R CI CV R 52 R AS rquot dqu qm T If AT 0 then AB 0 and q w quotW T dV 1 61qu V m1 State Function AT 2 0 dqu 2 quotRT Mimi T quotmatind Hess Law extensive property W T Standard State AV 2 0 dqu nCVdT AS d9 nCV AHOrxn 2AHof prOdUCtS 1 ZAHO freactants AP 2 0 dqu nCPdT AS j nCPln J The Second Law ASuniverse ASsystem ASsurroundings AS AH m AGAGRYlnQ and KQ at equilibriu surr T aAbBcCd gt em The Third Law AHBT Aszac on ZSSVOd 252a AGOm RTlnK Entropy and Phase Changes ASuniV O Asosys AHsys T AGrXIl AGOrXIl RTlnQ RTlnK RTlnQ AG AH TAS RTlnQK If AH lt 0 and AS gt 0 spontaneous at all T If AH gt 0 and AS lt 0 not spontaneous at all T If AH lt 0 and AS lt 0 spontaneous at low T o o If AH gt 0 and AS gt 0 spontaneous at high T AH 1 AS lnK AGIXVI Aern TASKXWI R T R 0 Aern TASKXWI o AG AH TAS 1mg 2 AH LL Kl R T2 Tl AGomn Z AGopmd Z AGoreacl Oxidation Loss of electrons Anode Reduction Gain of electrons Cathode Oxidation numbers Balance Redox Reactions Procedure Galvanic Cell Cell Notation Cell Potential and Half Cell Potential Standard Hydrogen Electrode qE cell w Faraday s Const AGO nFEOcell nFE cell RTlnK E00611 00257 Vn lnK Adding 2 Half Cell rxn 9 Full Cell rxn Adding 2 Half Cell rxn 9 Third Half Cell rxn AG AGO RTlnQ AG nFEcell Ecell ECcell Concentration Cell pH Meter Electrolytic Cell E amp M XXV c E hv photon 9 hmV me Vz hvphoton CD Bohr Model 2 E 2 178x1018 2 Quantum Mechanics quot Wavefunctions Probability Distributions 311 E y Ax o Ap 2 4 Quantization Particle iii a Box Hydrogen Atom E Z nzhz 8mL2En 72178x107181i WaveFuntion 9 Orbitals n ls p d f m1 mS Polyelectronic Atoms Aufbau principal Pauli exclusion Hund s Rule Periodic Table Valence Electrons Ionization Energy Electron Af nity Radii Ionic Bond Coulomb Stabilization Covalent Bond Polar Covalent Bond Electronegativity Dipole Moment 4 QR Molecular Geometry Octet Rule Percent Ionic Character Covalent Bond and AHrXIl AHW ZDbondsbmken EDI ands formed Lewis Dot Structures Bonding pair vs Lone Pair Resonance Structures Structural Isomers Formal Charge Exceptions Suboctet systemsValence shell expansion Oddelectron systems VE SPR 3D Electron Repulsion Linear Structures Trigonal Planar Structures Pyramidal Tetrahedral Trigonal Bipyramidal Octahedral Square Planar versus See Saw Adv VESPR Useful Information Constants h 6626X103934 Js c 3 X 108 ms F 96495 Cmol e e charge 16 X 103919 C 6 mass 91 X 103931 kg R 8314 JmolK 00821 LatmmolK 1 nm 10399 m 1D 2 2 2 h E 2178x10181 Z 2 E2 hz Ezhvzhilz n 8mL A p 00591V AGO nFEell RT1nK Ecell Ecell AG AGO RT1nQ aAbBcCdD gtKECCD AaB b QR 1 2 Emev thhotonCD Vr 231x1019Jnmj Ax o Ap L r r 47f n 12 1n 1n 2 0 m1101msi12 AH Z AHb0ndsbr0ken Z AHb0ndsf0rmed Chemistry 152A Spring 2006 Preparing for hour exam 1 Friday April 21 1 There will be a seating chart posted early next week you MUST sit in your assigned seat and have UW ID 2 all answers Will be written on your exam paper so there is no need for either exam books or quotSense forrnsquot 3 bring sharp pencils erasers and a quotsimple calculatorquot and NO other electronic devices 4 The exam is quotclosed book and no notesquot You will be provided on the exam cover sheet with a listing of any and all quotequationsquot and quotdataquot you might need The exam will cover the assigned materials from Ch 910 see sections specifically mentioned in the syllabus the rst three labs homework sets 13 quizzes 12 and from lectures up to and including Wednesday April 19 Note that there will be a regular lecture on quotelectrochemistryquot a new topic on April 20 which will be not included in the material for exam 1 As homework set 4 will be due the following week quotonly conceptual questionsquot will come from this part of the course material How to study be sure you can work the previously assigned homework problems the quotexamplequot problems in the Zumdahl text the prelab problems and the quiz problems study time is working and learning to work these problems Reading the text while important the first time around and while learning to work problems becomes much less important in preparing for the exam So don39t fool yourself into thinking that quotreading the bookquot counts as exam review and study Be able to solve actual problems and to understand their conceptual back ground There will be both quotconceptualquot and quotcomputationalquot problems The conceptual problems will be either quotmultiple choicequot or asking quotwhyquot a certain answer came out the way it did or how a quot general principlequot was actually employed in solving a problem After reviewing the above lake a look at the following quotexam reviewquot problems which you should attempt to quotsolvequot on your own ie it39s ne to work in groups for review but at the end try to quottest yourselfquot The following list of problems is longer than that for your 50 minute exam but even so it is not guaranteed to provide complete coverage of all possible material which might appear on an exam 39 I am expecting the actual exam to be 40 multiple choice and then 60 worked problems where partial credit may be earned and also conceptual questions asked with short written answers required SHORT means a few well chosen words not a page or a paragraph REVIEW QUESTIONS Part 1 Multiple Choice All multiple choice questions are worth 4 points unless otherwise noted Please circle the letter corresponding to the correct answer 1 A gas absorbs 2 J of heat and then does 12 J of work What is AE a lOJ b 14 c 10 d 14 e none of the above 2 Cold packs whose temperature is lowered when ammonium nitrate is dissolved in water are used by athletes and hikers when transporting ice is not possible Which of the following is true of this reaction a AH lt 0 and the reaction is exothermic b AH lt 0 and the reaction is endothermic c AH gt 0 and the reaction is exothemiic 1 AH gt 0 and the reaction is endothermic 3 Which one of the following statements is false a The change in internal energy AE for a process involving PV work only is equal to the amount of heat absorbed at constant volume qv b The change in enthalpy AH for a process is equal to the amount of heat absorbed at constant pressure qp c A bomb calorimeter measures AH directly d If qp for a process is negative the process is exothermic e The freezing of water is an example of an exothermic reaction 4 For a particular process q 10 kJ and w 25 k Which of the following statements is true a Heat ows from the surroundings to the system b The system does work on the surroundings c AB 35 k d All of the above are true e None of the above is true 5 Consider a reaction for which the heat of reaction is 10000 k at 25 C If the reaction is carried out in a coffee cup calorimeter for which the total heat capacity of container and contents is 2500 kJ what is the approximate change in temperature of the calorimeter NAME IEIAaO6 a decrease 25 C b increase 25 C 0 decrease 4 C 1 increase 4 C e none of the above 6 If I looked up in thermodynamic tables and found the entropy at 77 C of a substance A which melts at 77 C to be 100 JK mol what could I say about the amount of heat it would require to fuse A 8 a 10077 b 100 77 c 100700 d 100 700 e none of the above The heat capacity of an ideal gas is a 15R for a process carried out at constant P b 32 for a process carried out at constant V c 35R for a process carried out at constant V d 15R for a process carried out at constant V e greater than for a real gas t none of the above Consider the following set of statements about the relationship of measurables quantities I can measure directly in the lab to thermodynamic quantities in any process such that the measured values I list are su icient for calculating the exact thermodynamic value To get the value for AS I simply measure q and T To get the value for AE I only need to measure AT To get the value for AH I simply measure q and AT To get the value for AH I simply measure CAT 99 39 a Only 1 is correct b 1 and 3 are correct c 1 3 and 4 are correct 1 2 is correct e none is correct 910 6 points each Note that in the next two questions irr refers to an irreversible process rev means reversible exp means expansion and comp means compression and where w means the magnitude lwl ie don t worry about the sign NANLE IHEIAa06 9 Consider the work required to reversibly compress or expand an ideal gas under constant temperature conditions Which of the following statements is true a wrev comp gt win comp b wrev comp win comp c wrev comp lt win comp d not enough information to tell 10 Consider the work required to reversibly compress or expand an ideal gas under constant temperature conditions Which of the following statements is true a Wm exp gt win exp b Wm exp win exp c wrev exp lt win exp 1 not enough information to tell 11 Which of the following must prevail to satisfy the condition that AH q measured 1 Constant P 2 Constant T 3 Constant V 4 No electrical work 5 reversible a Onlyl b 1and2 c 2and4 d 1and5 e land4 12 One mole of a liquid is vaporized at its boiling point 27 C and 100 atm Assume the vapor behaves as an ideal gas Which value of w is closest to the right answer a 3 00R b 3 00R c 40 kJ27 d 40 kJ3 00 e 40 kJ300 t none of these 13 For an isothermal irreversible expansion of an ideal gas which of the following is true a ASSs 0 b ASsys gt 0 c ASsys lt 0 d ASsys can t tell because the process is irreversible NAME HEIAaO6 14 For an isothermal free expansion into a vacuum of an ideal gas which of the following is true a ASsm 0 b ASsulrr gt O c ASsun lt 0 d ASS can t tell because the process is irreversible 15 Calculate the work for the expansion of an ideal gas from 20 to 50 liters against a pressure of 20 atm at constant temperature a 60 liter atm b 60 liter atm c 0 d 30 liter atm e 30 liter atm 17 15 points The heat combustion of acetylene C4H2g at 25 C is roughly l300 kJmol At this temperature AH f values for C02g and H200 are roughly 400 kJmol and 300 kJmol respectively a 4points Write the balanced chemical equation for the combustion of acetylene b 5 points Write the balanced chemical equations that would yield the heats of formation of the products of the above reaction Show the appropriate values of AH f at the right for each equation c 6 points Calculate AH f for acetylene
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