Abstract
Chemical kinetics is the study of the rates at which reactions proceed, and the mechanisms by which the overall changes occur. The term “active mass” is used to describe the amount of the particular reactant, which is able to take part in the reaction. If the reactants A, B and C all exist in the same phase, gas, liquid or solution, the total amount of each is able to react, but if they are not in the same phase, this is not so. For a single-step reaction occurring in isolation and at constant temperature, the rate of the reaction decreases as the reaction proceeds, due to the decrease in the active masses of the reactants. The manner of the variation of the rate with time depends on the number of atoms, molecules or ions involved in the bond rearrangement. This number is known as the molecularity of the reaction.
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