Question

which statement about catalysts is true? catalysts increase the activation energy required for the reaction. catalysts are not used up during the reaction. catalysts slow down the rate of reaction. catalysts always change states of matter during the reaction.

Explanation:

To determine the true statement about catalysts, we analyze each option:

• "Catalysts increase the activation energy required for the reaction": False. Catalysts lower activation energy.
• "Catalysts are not used up during the reaction": True. Catalysts participate but remain chemically unchanged and available for reuse.
• "Catalysts slow down the rate of reaction": False. Catalysts (positive catalysts) increase reaction rate.
• "Catalysts always change states of matter during the reaction": False. Catalysts don't necessarily change states.

Answer:

B. Catalysts are not used up during the reaction