Tue March 20, 2012 By: Pooja Anand

what is catalyst????what is its use????why it is used in an chemical reaction???please explain with 2 examples....

Expert Reply
Wed March 21, 2012
Catalyst is a substance, usually used in small amounts relative to the reactants, that modifies and increases the rate of a reaction without being consumed in the process.
use :
Catalysts work by providing an (alternative) mechanism involving a different transition state and lower activation energy. Consequently, more molecular collisions have the energy needed to reach the transition state. Hence, catalysts can enable reactions that would otherwise be blocked or slowed by a kinetic barrier. The catalyst may increase reaction rate or selectivity, or enable the reaction at lower temperatures.
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