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350
5.
Arrhenius equation indicates that larger the value of Ea, smaller is the rate constant and
slower is the rate of reaction.
E
As T increases a decreases.
RT
This causes an increase in –
Ea
– E /RT
, e a , k and hence, the rate of reaction.
RT
T
⇒ E a /RT ⇒ – E a /RT ⇒ e –E a /RT ⇒
k
⇒
rate
increases
decreases
increases
increases
increases
increases
(d) Arrhenius equation and temperature variation :
Relation showing variation in rate constant with temperature.
1. As per Arrhenius equation
k = A × e – E a /RT
Where k = rate constant at temp T
A = frequency factor
Ea = Energy of activation
2. Taking log we get
ln k = ln A –
Ea
RT
log10k = log10A –
Ea
2.303 RT
Unique Solutions ®
S.Y.J.C. Science - Chemistry - Part I
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