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### Topic: Rate of reaction? Rate Laws?  (Read 4539 times)

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#### 777888

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##### Rate of reaction? Rate Laws?
« on: January 17, 2005, 12:42:59 PM »
Can someone explain to me what is the difference between "rate of reaction" and "rate laws"?

What are the meanings of "order of reaction" and "overall order of reaction"? Is it really the "order" the reaction occurs? Order 1 means occur first or faster? Order 2 means react next or slower? Then what is the significance of "total order"? What does it mean if a reaction is first order, second order or ZERO order???

Thank you!
« Last Edit: January 17, 2005, 01:32:42 PM by 777888 »

#### Demotivator

• Guest
##### Re:Rate of reaction? Rate Laws?
« Reply #1 on: January 17, 2005, 02:14:23 PM »
rate of rxn is the actual number, like 0.5 mole/sec.
rate law is the equation like rate = k[a]

Order is not sepuence. It is the exponent or sum of exponents of  reactants in the rate law.
r = k[A]^2
Is first order in A, second order in B, and third order overall.

#### 777888

• Guest
##### Re:Rate of reaction? Rate Laws?
« Reply #2 on: January 17, 2005, 03:21:18 PM »
Oh I see!
What is ZERO order?

#### Mitch

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##### Re:Rate of reaction? Rate Laws?
« Reply #3 on: January 17, 2005, 03:25:29 PM »
It means the rate doesn't rely on what your measuring. Like zero order in [A] means the rate doesn't matter on the concentration of [A].
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#### 777888

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##### Re:Rate of reaction? Rate Laws?
« Reply #4 on: January 17, 2005, 05:47:14 PM »
OK! Thanks!