What does a catalyst do when added to a chemical reaction? Select all that apply. Question 3 options:

It lowers the activation energy.

It increases the activation energy.

It speeds up chemical reactions.

It gets consumed in the reaction.

Explanation:

A catalyst is a substance that increases the rate of a chemical reaction. Some examples are enzymes and acid-base catalysts.

They can do this by lowering activation energy (the energy needed to undergo a reaction) or modifying a certain mechanism in the reaction.

Catalysts are unique because they aren't consumed or used up in a reaction. They can be reused many times.

So, based on the information above, catalysts do not increase the activation energy or get consumed in the reaction. That leaves two correct answers: they lower the activation energy and speed up chemical reactions.

the dissolution of polymer can be thermodynamically described in 2 steps.