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as T , k. As temperature increases, rate increases because. (WHY does T affect rate = k [A] [B]?). collision model : explains how rate is affected by [ ] and by temperature. -- greater [ ]:. more collisions per sec. -- higher temperature:. faster particles, more

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slide1

as T , k .

As temperature increases,

rate increases because...

(WHY does T affect

rate = k [A] [B]?)

collision model: explains how rate is affected

by [ ] and by temperature

-- greater [ ]:

more collisions per sec.

-- higher temperature:

faster particles, more

collisions per sec.,

activation energy (Ea)

is exceeded more often

slide2

activated complex:

the temporary arrangement of

atoms btwn. “R” arrangement

and “P” arrangement

About DE...

+

Ea

-- it is ___ for endo.

and___ for exo.

Ea of

reverse

reaction

R

Energy

--

it has NO effect on

the reaction rate

DE

P

Time

slide3

e.g., Cl + NOCl Cl2 + NO

(

)

k1

Ea

1

1

ln

=

k2

R

T2

T1

For the reaction to occur, collisions must take place

with particles oriented in a certain way.

Cl

Cl

NOCl

NOCl

“NOPE.”

“YEP.”

For a given reaction, the Ea relates rate constants

at two different temps WITH those temps.

Ea in J/mol

R = 8.314 J/mol-K

T = absolute temp.

slide4

T (oC) k (s–1)

189.7 2.52 x 10–5

251.2 3.16 x 10–3

(

)

k1

Ea

1

1

ln

=

k2

R

T2

T1

Using the following

information, find...

(1) ...Ea

(2) ...k at 430.0 K

(1)

Ea = 1.59 x 105 J/mol = 159 kJ/mol

slide5

T (oC) k (s–1)

189.7 2.52 x 10–5

251.2 3.16 x 10–3

Using the following

information, find...

(1) ...Ea

(2) ...k at 430.0 K

(2)

(take “e-to-the-both-sides”…)

(Using T = 524.4 K and

k = 3.16 x 10–3 gives

k430 = 1.05 x 10–6 s–1)

k430 = 1.07 x 10–6 s–1