PEER ASSISTED STUDY SESSIONS

PEERASSISTEDSTUDYSESSIONS
Facil:MadiWright
Course:CHEM1002A&V
Week:5
Email:[email protected]:ML408OfficeHour:Tuesdays1:00-2:00pm
Lectures:PrinciplesofChemicalEquilibrium
Textbook:Chapter14
Topics:
• Equilibrium
• EquilibriumConstant
• ReactionQuotient
• ICETables
• LeChâtelier’sPrinciple
Opener
(5minutes)
Howdidthemidtermgo?!
TwoTruthsandaLie!
(20minutes)
Determinewhichstatementisalie,andexplainwhy.
Introduction
1. Mostreactionsarereversible
2. Iftheconcentrationsarenotchanging;forwardrate=reverserate
3. Equilibriumisaconstantprocess
HeterogeneousEquilibrium
1. Solidphasesareneverincludedintheequilibriumconstant
2. Liquidphasesareneverincludedintheequilibriumconstant
3. Solidandliquidstatesareincludedintheequilibriumconstantonlyifthey
aretheonlyphasesinthereaction
PropertiesofEquilibriumConstants
1. Itisrelatedtothestoichiometryofthebalancednetreaction
2. Itappliesonlyatequilibrium
3. Itisdependentofitsinitialconditions
Keq
1. ThisconstantsunitsareM
2. Keqisdimensionless
3. Keq=[C]c[D]d/[A]a[B]b
EquilibriumSystems
1. IfΔG°<0then,reactants>products
2. IfΔG°<0then,reactants<products
3. IfΔG°≈0the,reactants≈products
DISCLAIMER:PASSworksheetsaredesignedasastudyaidforuseinPASSworkshopsonly.Worksheetsmay
containerrors,intentionalorotherwise.Itisuptothestudentstoverifytheinformationcontainedwithin.
PEERASSISTEDSTUDYSESSIONS
Facil:MadiWright
Course:CHEM1002A&V
Week:5
Email:[email protected]:ML408OfficeHour:Tuesdays1:00-2:00pm
ICETables
1. KcanbesimplifiedifK<x10-2
2. ICEstandsforInitial,ChangeandEquilibrium
3. Whenusingthequadraticformula,youcanneverhaveanegative
concentration
PredictingEffectsofPhysicalChanges
1. Increasingthetemperatureshiftstheequilibriumintheendothermic
direction
2. Raisingpressuremovestheequilibriumtohigherpressure
3. Loweringtemperaturemovestheequilibrium,increasingtheyieldand
reducestherate
LeChâtelier’sPrinciple
1. AnychangeinconditionsthatincreasesthevalueofQcausesthereactionto
consumeproductsandproducereactionsuntilequilibriumisre-established
2. AnychangeintheconditionsthatdecreasesthevalueofQcausesthe
reactiontoformproductsandconsumereactantsuntiltheequilibriumisreestablished
3. AnychangeinamountsthathasnoeffectonthevalueofQwillstillhavea
slighteffectontheequilibriumposition
RelevantEquations
(5minutes)
• Let’sbrainstormequationstogetherthatcouldbeusedinthelonganswer
calculations
DISCLAIMER:PASSworksheetsaredesignedasastudyaidforuseinPASSworkshopsonly.Worksheetsmay
containerrors,intentionalorotherwise.Itisuptothestudentstoverifytheinformationcontainedwithin.
PEERASSISTEDSTUDYSESSIONS
Facil:MadiWright
Course:CHEM1002A&V
Week:5
Email:[email protected]:ML408OfficeHour:Tuesdays1:00-2:00pm
LongAnswerQuestions (40minutes)
1.Theequilibriumconstantfortheprotontransferreactionofbenzoicacidis
calculatedtobe6.4×10-5.Giventhefollowingreaction,calculatetheequilibrium
concentrationofbenzoicacidandthebenzoateanionsina5.0×10-2Maqueous
solutionoftheacid.
H2O(l)+C6H5CO2H(aq)!"C6H5CO2-(aq)+H3O+(aq)
DISCLAIMER:PASSworksheetsaredesignedasastudyaidforuseinPASSworkshopsonly.Worksheetsmay
containerrors,intentionalorotherwise.Itisuptothestudentstoverifytheinformationcontainedwithin.
PEERASSISTEDSTUDYSESSIONS
Facil:MadiWright
Course:CHEM1002A&V
Week:5
Email:[email protected]:ML408OfficeHour:Tuesdays1:00-2:00pm
2.At298K,Keq=0.0900forthereactionH2O(g)+Cl2O(g)!"2HOCl(g).
(a)CalculatetheequilibriumpartialpressureofeachgasifinitiallypH2O=pCl2O=
100PaandpHOCl=0.
(b)Calculatethestandardfreeenergychangeofthisreaction(kJmol-1)at298K.
Closer:StressedOut?!
(5minutes)
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DISCLAIMER:PASSworksheetsaredesignedasastudyaidforuseinPASSworkshopsonly.Worksheetsmay
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