Catalyst is a chemical substance that speeds up the chemical reaction without altering the final product and without undergoing any chemical change in itself. However it may change its physical state.


Some reactions do not require catalyst to proceed but in some it is necessary to use appropriate catalyst to complete the reaction in practical time.


Catalyst able to speed up the reaction by decreasing activation energy. Given graph shows clear picture of working of catalyst. 



Thanks for reading. Hope you got your answer. Stay tuned with concept chemistry for more.