CHM001B WS14:ChemicalKinetics
MissionCollege1|P a g e
Name______________________________ Date______________ Grade______________
Q1.Considerthereaction:
2𝑁!𝑂 𝑔 → 2𝑁! 𝑔 + 𝑂!(𝑔)
a. Expresstherateofthereactionintermsofthechangeinconcentrationofeachofthereactantsandproducts.
b. Inthefirst15.0softhereaction,0.015molofoxygengasisproducedinareactionvesselwithavolumeof0.500L.Whatistheaveragerateofthereaction(inM/s)duringthistimeinterval?
c. Predicttherateofchangeintheconcentrationofdinitrogenmonoxide(inM/s)duringthistimeinterval.
CHM001B WS14:ChemicalKinetics
MissionCollege2|P a g e
Q2.Considerthereaction:
𝑁𝑂! 𝑔 → 𝑁𝑂 𝑔 + 12𝑂!(𝑔)
Thedatabelowwascollectedfortheconcentrationofnitrogendioxideasafunctionoftime:
Times (s) [NO2] (M)
0 1.00010 0.95120 0.90430 0.86040 0.81850 0.77860 0.74070 0.70480 0.67090 0.637
100 0.606
a. Whatistheaveragerateofreaction(inM/s)between10and20s?Between50and60s?
b. Whatistherateofformationofoxygengas(inM/s)between50and60s?
CHM001B WS14:ChemicalKinetics
MissionCollege3|P a g e
Q3.Whataretheunitsofkforeachtypeofreaction?Showyourwork.
a. zero-orderreaction
b. first-orderreaction
c. second-orderreaction
Q4.Thereactionisfirstorderwithrespecttodinitrogenpentaoxide:
𝑁!𝑂! 𝑔 → 𝑁𝑂! 𝑔 + 𝑁𝑂!(𝑔)
Therateconstantforthereactionatacertaintemperatureif0.053s-1.
a. Calculatetherateofthereaction(inM/s)whentheconcentrationofdinitrogenmonoxideis0.055M.
b. Whatistherateofthereaction(inM/s)attheconcentrationindicatedinpartaifthereactionissecondorder?(Assumethesamenumericalvaluefortherateconstantwiththeappropriateunits.)
CHM001B WS14:ChemicalKinetics
MissionCollege4|P a g e
Q5.Considerthereactionanddatabelow:
𝐶𝐻!𝐶𝑙 𝑔 + 3𝐶𝑙! 𝑔 → 𝐶𝐶𝑙! 𝑔 + 3𝐻𝐶𝑙(𝑔)
[CH 3Cl] (M) [Cl2] (M) In it ia l rate (M/s)
0.050 0.050 0.0140.100 0.050 0.0290.100 0.100 0.0410.200 0.200 0.115
a. Whatistheratelawforthereaction?
b. Calculatethevalueoftherateconstant.
c. Whatistheoverallorderofthereaction?
CHM001B WS14:ChemicalKinetics
MissionCollege5|P a g e
Q6.Answerthefollowingquestionsbasedonthedataprovided:
𝑁!𝑂! 𝑔 → 𝑁𝑂! 𝑔 + 𝑁𝑂!(𝑔)
Time (s) [N2O5] (M)
0 1.00025 0.82250 0.67775 0.557
100 0.458125 0.377150 0.310175 0.255200 0.210
a. Whatistheoverallorderofthereaction?
b. Calculatethevalueoftherateconstant.
c. Whatistheconcentrationofdinitrogenmonoxideat250s?
CHM001B WS14:ChemicalKinetics
MissionCollege6|P a g e
Q7.Thisreactionwasmonitoredasafunctionoftime:
𝐴𝐵 → 𝐴 + 𝐵
Aplotof ![!"]
versustimeyieldsastraightlinewithslope-0.055M/s.
a. Whatisthevalueoftherateconstantforthisreaction?
b. Writetheratelawforthereaction.
c. Whatisthehalf-lifewhentheinitialconcentrationis0.55M?
d. IftheinitialconcentrationofABis0.250M,andthereactionmixtureinitiallycontainsnoproducts,whataretheconcentrationsofAandBafter75s?
CHM001B WS14:ChemicalKinetics
MissionCollege7|P a g e
Q8.Thehalf-lifefortheradioactivedecayofC-14is5730yearsandisindependentofinitialconcentration.Howlongdoesittakefor25%oftheC-14atomsinasampleofC-14todecay?IfasampleofC-14initiallycontains1.5mmolofC-14,howmanymillimolesareleftafter2255years?
Q9.Achemicalreactionisendothermicandhasanactivationenergythatistwicethevalueoftheenthalpychangeofthereaction.Drawadiagramdepictingtheenergyofthereactionasitprogresses.Labelthepositionofthereactantsandproductsandindicatetheactivationenergyandenthalpyofreaction.
Q10.Therateconstantofareactionat32°Cis0.055s-1.Ifthefrequencyfactoris1.2x1013s-1,whatistheactivationbarrier(inkJ/mol)?
CHM001B WS14:ChemicalKinetics
MissionCollege8|P a g e
Q11.UseanArrheniusplottodeterminetheactivationbarrier(inkJ/mol)andfrequencyfactor(ins-1)forthereaction.
Temperature (K) Rate constant (s-1)
300 0.0134310 0.0407320 0.114330 0.303340 0.757
Q12.Areactionhasarateconstantof0.000122s-1at27°Cand0.228s-1at77°C.
a. Determinetheactivationbarrierforthereaction.
b. Whatisthevalueoftherateconstantat17°C?
CHM001B WS14:ChemicalKinetics
MissionCollege9|P a g e
Q13.Considerthistwo-stepmechanismforareaction:
𝑁𝑂! 𝑔 + 𝐶𝑙! 𝑔 !! 𝐶𝑙𝑁𝑂! 𝑔 + 𝐶𝑙 𝑔 𝑆𝑙𝑜𝑤
𝑁𝑂! 𝑔 + 𝐶𝑙 𝑔!!
𝐶𝑙𝑁𝑂! 𝑔 𝐹𝑎𝑠𝑡
a. Whatistheoverallreaction?
b. Identifytheintermediatesinthemechanism.
c. Whatisthepredictedratelaw?
Top Related