Rate expression- tells us about the contributions of the species that do affect the reaction rate.
It is an equation that describes how the rate of the reaction at a particular temperature depends on the concentration of species involved in the reaction. It's quite possible that 1 or more of the species that appear in the chemical equation will not appear in the rate expression. This means they do not affect the rate.
Order of reaction- the experimentally determined POWER to which a reactant concentration is raised in a rate equation.
Rate = K (A)p
K = a constant for a particular reaction at a given temperature (the rate constant)
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