Below are highlighted important definitions which you should have mastered.
Reaction rate: Change in concentration of a reactant or product with respect to time
Differential rate law: Shows the mathematical relationship between rate and concentration of substances up on which rate depends.
Reaction rate: Change in concentration of a reactant or product with respect to time
For aA + bB 
cC + dD
A, B, C and D are substances.
a, b, c and d are coefficients.
cC + dDA, B, C and D are substances.
a, b, c and d are coefficients.
| reaction rate = | -Δ[A] | = | -Δ[B] | = | Δ[C] | = | Δ[D] |
| a × Δt | b × Δt | c × Δt | d × Δt |
Differential rate law: Shows the mathematical relationship between rate and concentration of substances up on which rate depends.
General form: rate = k[A]x[B]y.
x and y MUST BE experimentally determined.
k, the rate constant, is constant for a reaction at a temperature.
x and y MUST BE experimentally determined.
k, the rate constant, is constant for a reaction at a temperature.
The order of reaction in a substance is the exponent on the concentration of that substance in the rate law.
The reaction having the rate law above is x order in A, y order in B and x+ y order overall.