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CH 15:
rate of rxn(relative rate) = ∆[]/∆t EX: 2N
2
O
5
4NO
2
+ O
2
... –½ ∆[ N
2
O
5
]/∆t = ¼∆ [NO
2
]/∆t = ∆[ O
2
]/∆t
\
rate constant = K[A]
m
[B]
n
EX:
2NO + Cl
2
2NOCl…K[NO]
2
[Cl
2
]
\
Instantaneous rate
: determined by drawing tangent line to the [] – time curve at particular time…obtain rate
from slope of line
\
catalysts
: substances that accelerate chemical reactions, but are not themselves transformed
\
order of rxn
: obtained experimentally
\
rate constant k
: proportionality constant that relates rate and concentration at a given temp
\
1
st
order rxns
: units of k are time
1
…
2
nd
order rxns
: units
of k are L/mol * time…
3
rd
order rxns
: units of k are mol/L * time
\
integrated rate eq.
: ln * [R]
t
/[R]
0
= kt (for 1
st
order)…[R]
0
= rxn time t=0 and [R]
t
= later time t
\
integrated rate eq.: 1/[R]
t
– 1/[R]
o
= kt (for 2
nd
order)
\
integ. rate eq.: [R]
0
– [R]
t
= kt (for zero order)
\
half life (t
1/2
)
: t
1/2
= 0.693/k
\
homogenous catalyst
: catalyst present in same phase (gas, solid, liquid) as the reactants
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This note was uploaded on 06/08/2008 for the course CH 223 taught by Professor Carney during the Spring '08 term at Linn Benton Community College.
 Spring '08
 Carney

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