Which of the following is true about catalysts?
a catalysts increase the number of collisions that occur between reactants.
b catalysts increase the activation energy by forming new reactants.
c catalysts reduce the potential energy of the compounds that are produced.
d catalysts reduce the energy needed for the reaction to take place.

D

Explanation:

Catalysts lower the activation energy of the reactants so the reaction proceeds faster than naturally.  The catalyst does not change the reaction (the potential energy of the reaction remains the same) in any other way and is not caused by the reaction.

practical process described pest part of scientific investigation.

because practical knowledge is powerful then therotical knowledge.