Question

what is a catalyst and what is its role in a chemical reaction??

Answer 1

it is used to increase or decrease the rate of chemical reaction like platinum

Answer 2

Catalysts called enzymes are important in biology. A catalyst works by providing an alternative reactionpathway to the reaction product. Therate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.

I hope this helps you.