Answer:
A catalyst changes the activation energy of a reaction.
A catalyst speeds a reaction up.
What's a catalyst?
A catalyst is a chemical substance that takes part in a chemical reaction and speeds up the reaction while remaining unchanged in the product.
Points to be remembered about the catalyst:
[tex]\sf \small \pink{Thanks }\: \green{for} \: \blue{joining} \: \orange{brainly } \: \red{community}![/tex]