Chemical Reaction Engineering
Rate constant for a first order reaction does not depend upon reaction time, extent of reaction and the initial concentration of reactants ; but it is a function of reaction temperature. In a chemical reaction, the time required to reduce the concentration of reactant from 100 gm moles/litre to 50 gm moles/litre is same as that required to reduce it from 2 gm moles/litre to 1 gm mole/litre in the same volume. Then the order of this reaction is

1
0
2
3

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Chemical Reaction Engineering
For a heterogeneous catalytic reaction

The surface of the catalyst does not play an important role during reaction
A relatively small amount of catalyst can cause the conversion of large amount of reactants which does not mean that catalyst concentration is important
Free energy of activation is lowered in the presence of catalyst, which remains unchanged at the end of reaction
The catalyst does not form an intermediate complex with the reactant

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Chemical Reaction Engineering
In a zero order reaction, reactants concentration does not change with time and the

Time for half change is independent of the initial concentration
Time for completion of the reaction is independent of the initial concentration
Reaction rate is trebled when the initial concentration is trebled
Time for half change is half the time taken for completion of the reaction

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