TYPES OF REACTION:
Different reactions take different amount of time for completion. Hence the reactions may classify with respect to their rates as follows:
1. VERY FAST REACTION:
A reaction in which reactants are converted in to products in a very small period of time is called fast reaction.
The activation energy of a fast reaction is very low.
Since fast reaction requires less time or instant to complete therefore the velocity of fast reactions can not be calculated e.g. combustion of gasoline.
All ionic reactions like:
HCI + NaOH ———–> NaCl + H2O
2. VERY SLOW REACTION:
A reaction in which reactants are converted in to products in a very long period of time is called slow reaction.
The activation energy of a slow reaction is very high. It is difficult to determine experimentally velocity of such reactions. eg.
– Rusting of iron
– Radioactive decay of elements
– Formation of diamond from carbon
3. MODERATE REACTION:
The reaction which proceeds at experimentally measurable rate or velocity is called reaction of moderate speed.
They have limited speed and activation energy of moderate reactions is neither very high nor very low e.g. reactions of organic and covalent like:
CH3COOH + C2H5OH ———–>CH3COOC2H5 + H20