Chemistry

The rate of reaction

is the change in the amount of a reactant or product per unit of time.

rate expression

for the reaction. The brackets indicate molar concentrations, and the symbol delta (Δ) indicates “change in.”

average rate

Using the concentrations at the beginning and end of a time period over which the reaction rate is changing results in the calculation of an average rate for the reaction over this time interval.

instantaneous rate

Instantaneous rate is the rate of change at a specific point in time. It can be used to describe the r

initial rate

The instantaneous rate of a reaction at “time zero,” when the reaction commences, is its