Chemical Kinetics





Some chemical reactions are instantaneous while some proceed slowly. It is possible to measure the speed and study of the reaction mechanism for slow reactions. Thus the study of the mechanism of reaction is known as chemical kinetics.

Very Fast Reactions occurs very fast so can be studied by special techniques like flash photolysis etc.

E. g. \toIonic Reactions \toOccurs very fast as E_a is zero for them [E_a \to Activation energy]

E.g.\to (1) AgNO_3 + NaCl \to AgCl + NaNO_3 \\ (2) BaCl_2 + H_2SO_4 \to BaSO_4 + 2HCl

Very Slow Reactions Occurs very slowly and take day, weeks, months to complete.

E. g.\to Rusting of iron.

Moderate Reactions Occur with a suitable speed, i. e., neither very fast nor very slow so studied under kinetics. E.g. \toMost of the molecular reactions:

\underset{\text{Sucrose}}{C_{12}H_{22}O_{11}} + H_2 O \overset{H^+}{\rightarrow} \underset{\text{Glucose}}{C_6 H_{12} O_6} + \underset{\text{Fructose}}{C_6H_{12} O_6}

 

\underset{\text{Ethyl acetate}}{CH_3COOC_2H_5} + H_2O \overset{H^+}{\rightarrow} \underset{\text{Acetic acid}}{CH_3COOH} + \underset{\text{Ethyl alcohol}}{C_2H_5OH}

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