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.

shield volcanos are angry and get mad over the smallest things so much that there heads erupt   pahoehoe and a'a lava. a composite volcano is the poller opposite of a shield volcano. its   peaceful thing and knows how to control its emotions.