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Lecture Notes CH102 Unit 2

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Unit 2 consolidated lecture notes for unit 2 of CH102 at Boston University. Topics include reaction rates, order of reactions, reaction constants, Arrhenius equation, activation energies, and elementary steps.

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#Sections
.




Rate of reaction experimentally only measure or of reactants and products
·


we can
-




·
How do we calculate rate ?
concentration


3

Ra
-
Rate of chemical reactions
A+ B - C + D
reactants rate of

=
:



consumption

13579
time


products-rate of production
Ru :

A
Raterin = process of 1A reacting with 1B to make IC and 1D
↳ Rrm Rc =
RD Ra
=

RB
Galways
= = - -




be positive!
·
A+ B 3C D
= +




Raternat
Consider the reaction N2Ou(g) -LNO2(g) .
The rate of NO2 produced is 0. 85 what is
,


the rate of
consumption of NeOn
?




Doespassa( * In this case,products are
faster be for every 1
being made
ran creates 2

should be
products; product rate
D larger than reactants


↳ (0 85) 04 =

must bestarts
.
.




be of

,t continuedRate
↳ ratep-Rate Rate
e
= D
In chemical ra , 2A + 3B-C, the initial rate of B is -0 . 155 The
.
rate of r is ...




Rum :

-(Rate) : (-0 15) .
=
0 .
055

Rate A ?.
Prn(Rate)
0 .
055 = (Rate) notice rate is lower then
>
-
Rates :
-0 . 10 rates

N2Os -2NO2 + 02
concentration NOz * Collision theory *
2 0
.
·
Raterm & [X]
· Raterin is dependent on concentration
1 S .
of reactants
?
go down
does Run
1 0
02
why
time there are less reactants available to
,



↳ over react
S NaOS
,
0 .




with
20 40 60 80 100
# (min]

Differential rate laws
order of reaction of reactant is how dependent the rate of reaction is on the
given
·
a



species
aA bBedD+




&
Rate Ratern :
=
KCAJ(BJ3 X,
ye orders of ren in


A und B




coefficients

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Uploaded on
March 5, 2025
Number of pages
14
Written in
2024/2025
Type
Class notes
Professor(s)
Abrams
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