Question

the effect an enzyme has on a chemical reaction is because the enzyme

changes the ph of the reaction.

causes the reaction to produce a different product.

increases the activation energy of the reaction.

prevents the reaction from occurring.

lowers the activation energy of the reaction.

Explanation:

Enzymes are biological catalysts. Catalysts lower the activation - energy required for a chemical reaction to occur, thus increasing the reaction rate without being consumed in the reaction. They do not change the pH of the reaction, cause a different product to form, increase activation energy, or prevent the reaction from happening.

Answer:

lowers the activation energy of the reaction.