What is Reaction Order?
The reaction order is the sum of the exponents of the concentration terms in the rate law equation. It describes how the reaction rate depends on the concentration of reactants.
Calculate Reaction Orders and Rate Constants
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Calculate parameters for zero-order reactions: [A] = [A]₀ - kt
Calculate parameters for first-order reactions: ln[A] = ln[A]₀ - kt
Calculate parameters for second-order reactions: 1/[A] = 1/[A]₀ + kt
The reaction order is the sum of the exponents of the concentration terms in the rate law equation. It describes how the reaction rate depends on the concentration of reactants.
In zero-order reactions, the rate is independent of concentration. The rate law is:
Rate = k
[A] = [A]₀ - kt
In first-order reactions, the rate is directly proportional to concentration. The rate law is:
Rate = k[A]
ln[A] = ln[A]₀ - kt
In second-order reactions, the rate is proportional to the square of concentration. The rate law is:
Rate = k[A]²
1/[A] = 1/[A]₀ + kt
General form: Rate = k[A]ⁿ[B]ᵐ
where n + m = overall order
Zero Order: t₁/₂ = [A]₀/2k
First Order: t₁/₂ = ln(2)/k
Second Order: t₁/₂ = 1/(k[A]₀)