right - ms. popov · 3. predict which way the following equilibrium systems will shift when the...
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Chemistry12
LeChatelier’sPrincipleWorksheetName:Date:Block:
1. StateLeChatelier'sPrinciple.Giveanexampleinyouranswer.2. Inordertodecidewhateffectachangeintotalpressurewillhaveonanequilibriumsystem
withgases,whatisthefirstthingyoushoulddowhengiventhebalancedequation?3. Predictwhichwaythefollowingequilibriumsystemswillshiftwhenthetotalpressureis
increased.(NOTE:Somemayhavenoshift) a)N2(g)+O2(g)⇋2NO(g) b)2SO2(g)+O2(g)⇋2SO3(g) c)4NH3(g)+5O2(g)⇋4NO(g)+6H2O(g)4. Whichwaywillthefollowingequilibriumshiftifthetotalpressureonthesystemis
decreased?Explainyouranswer.2C2H6(g)+7O2(g)⇋4CO2(g)+6H2O(g)
Forthequestions5,6,and7,usethefollowingequation:
N2O4(g)+heat⇋2NO2(g) colourless darkbrown 5. ExplainwhyaflaskfilledwithNO2(g)andN2O4(g)willgetdarkerwhenheated. 6. ExplainwhyasyringecontainingNO2gaswillfirstgetdarkerandthenlighterincolourwhen
compressed.
7. ExplainwhyaflaskcontainingNO2willgetlighterincolourwhenputintoicewater.
A system equilibriumwill shift to alleviatean imposedstress
Addupthe of molesofgas of each side of the equation
heshift 2gasmot on eachside
rightleft
dPmeans 9V shifttosidew moregasmolecules shift right
healingwill cause a shift right No would increase anddarkbrowncolourwoulddeepen
Compressionis 9P so the r n would shift lefttoward side w less gasmolecules
de heat Shiflett colour lightens
8. Hydrogenperoxidedecomposesasfollows: H2O2(l)⇋H2(g)+O2(g) ΔH=+187kJ Predictthedirectionofequilibriumshift(leftorright)byeachofthefollowingimposed
changes: a) Increasethe[H2] b) Decreasethe[O2] c) Decreasethetotalpressure d) Increasethetemperature e) AddMnO2asacatalyst f) Sketchagraphoftherelativeconcentrationsofeachspeciesastheprocessoutlinedina-e
ofthisquestioniscarriedout.9. Forthereaction:
2NO(g)+Cl2(g)⇋2NOCl(g)ΔH=-77kJ
statetheoptimalpressureandtemperatureconditionsnecessaryformaximumproductionofNOCl.
(highorlow?)_______________pressureand(highorlow?)_______________temperature10. Forthereaction:
3H2(g)+N2(g)⇋2NH3(g)+heat statetheoptimalconditionsforahighyieldofammonia(NH3). (highorlow?)_______________pressureand(highorlow?)_______________temperature
leftright
µ rightrightno shift
H2O is liquid concentration remains constant
CHI h
Oil Tr
l l I i la b c d e
high low
high low
11. Considerthefollowingequilibriumandstatewhichway(leftorright)theequilibriumshiftswheneachofthechangesbelowaremade,thensketchagraphoftherelativeconcentrations.
heat+CH4(g)+2H2S(g)⇋CS2(g)+4H2(g) a) CH4gasisadded b) CS2gasisremoved c) H2gasisadded d) Thetotalvolumeofthecontainerisdecreased e) Thetemperatureisincreased f) Thetotalpressureisdecreased12. Usingthefollowingequilibrium,statewhatwouldhappentotheequilibriumconcentrationof
CH3OHgaswheneachofthefollowingchangesaremade: CO(g)+2H2(g)⇋CH3OH(g)ΔH=-75.2kJ
a) COgasisaddedtothecontainer b) Thetemperatureisincreased c) Thetotalpressureofthesystemisincreased d) H2gasisremovedfromthesystem e) Acatalystisadded f) Thetotalvolumeofthecontainerisincreased
rightrightleft
AP left
rightright
city I
CHA 4ccs.IT
TCHzIN
I l I I lk b c d e f
increase shiftrightdecrease shift left
increase shift rightdecrease shift left
no change no shiftdecrease shift left
13. Giventhefollowingequilibriumsystem,statewhichwaytheequilibriumwillshiftwhenthechangesbelowaremade,thensketchagraphoftherelativeconcentrations.
2C2H6(g)+7O2(g)⇋4CO2(g)+6H2O(g)+heat a) Thevolumeofthecontainerishalved b) Thetemperatureisdecreased c) CO2isaddedtothecontainer d) Thetotalpressureisincreased e) O2gasisremovedfromthesystem f) Neongasisaddedtoincreasethetotalpressure h) Acatalystisadded
leftrightleftleftleft
no shift left
i
14. GiventhefollowinggraphshowingtheconcentrationsofspeciesA,BandC,fillinthetable
below.Theequilibriumequationis: A(g)+B(g)⇋C(g)ΔH=-65kJ
TimeI TimeII TimeIII TimeIV[A]Decreaseorincrease?
[B]Decreaseorincrease?
[C]Decreaseorincrease?
Shift?
Imposedstress?
decrease increase increase decreasespike thendecrease increase increase decrease
spike thenincrease decrease decrease increaseright left left rightadd B add heat add C removeheat