Chemical Reaction Engineering
The half life period of a first order reaction is

Always the same irrespective of the reaction
Proportional to the initial concentration of reactants
Half the specific rate constant
Dependent on initial concentration of the reactants

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Chemical Reaction Engineering
In Langmuir treatment of adsorption,

Extent of adsorption is more than one complete monomolecular layer on the surface
Whole surface of the catalyst does not have the same activity for adsorption and there is attraction between the adsorbed molecule
All the adsorption does not take place by the same mechanism
Whole surface of the catalyst is essentially uniform and the adsorbed molecule has no effect on the rate of adsorption per site

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