F325 ~ The Rate Equation and Orders

Rates Summary Sheet

Key points on rates which you need to know for the F325 exam.

(OCR F325)

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  • Created by: chloeeyay
  • Created on: 06-05-15 17:17
Preview of F325 ~ The Rate Equation and Orders

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chloeeyay
The Rate Equation and Orders
Zero Order Reactions
If the order is 0 with respect to a reactant A then rate [A]0
First Order Reactions
1
If the order is 1 with respect to a reactant B then rate [B]
Second Order Reactions
If the order is 2 with respect to a reactant C then rate [C]2
Half Lives
The half-life of a reactant is the time taken for the concentration of the reactant to reduce by
half.
Orders and concentration-time graphs
Zero Order Reactions
Concentration decreases at a constant rate
Half-life decreases with time
First Order Reactions
The first order reaction has a constant half-life
The half-life is the same no matter what the
concentration
Concentration halves in equal time intervals
Second Order Reactions
Concentration decreases rapidly, but the rate of
decrease then slows down
Half-life increases with time
Orders and rate-concentration graphs
Zero Order - rate [A]0
First Order - rate [B]1
Second Order - rate [C]2
The rate is unaffected by If [B] increase by 2, the rate If [C] increases by 3 times
changes in concentration will increase by 2. The rate the rate increases by 32 =9
increases by the same value. times

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