Catalysts are not _____ in a reaction.

• A. Consumed
• B. Produced
• C. Destroyed
• D. Changed

Answer: (A)

A catalyst speeds up a reaction by providing an alternative pathway with a lower activation energy, and it is not consumed in the process. After the reaction, the catalyst is back in its original form and amount, ready to catalyze more reactions. Because of this, its quantity and identity do not change overall, so it isn’t consumed.

It isn’t produced as a product, because the catalyst simply facilitates the transformation without becoming a final product. It isn’t destroyed, since it remains available for future cycles. While it may participate in intermediate steps and appear to undergo changes during the mechanism, those changes are reversible and the catalyst returns to its original state, leaving it unchanged in the net sense.