# CHEM 122 Lecture Notes - Lecture 6: Ideal Gas Law, Reaction Rate, Wanda Cinemas

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6 Feb 2017
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CHAPTER 12
chemical kinetics, study of reaction rates
average rate: -D[Conc]/Dt
instantaneous rate= rate for speciﬁc instance in time (won’t be asked to calculate)
initial rate:
2C -> 1D
then rate = 2/2 x - D[Conc]/Dt
rate = 1/2 x + D[Conc]/Dt
If the rate of formation of NH3 is 2.7x10^2 M/s, what is the rate of disappearance of
Nitrogen and Hydrogen?
N2 + 3H2 -> 2NH3
1/2N2 + 3/2H2 -> 2/2NH3
N: rate= 1/2 (2.7x10^-2M/s)=1.4x10^-2M/s
H: rate=3/2 (2.7….
Factors that affect reaction rate
1. Temperature directly proportional
2. concentration or pressure of reactions directly proportional n/v=P/RT
….related to ideal gas law
3. Catalysts
4. Surface Area smaller SA increases Reaction Rate ….thats why gun powder
THE RATE LAW is determined experimentally and always deﬁned in terms of
reactant concentrations
aA +bB —> cC +dD this reaction is xth order in A
this reaction is yth order in B
Rate = k [A]^x[B]^y overall order = x+y *not related to the
stoichiometric coefﬁcient
k is rate constant, temp, dependent
Rate is M/time
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