Which of the following statements is not true about catalysts? A) Catalysts do not change the value of an equilibrium constant. B) Catalysts provide an alternative reaction pathway that effectively lowers the activation energy. C) Catalysts can be recovered unchanged after a reaction completes. D) Catalysts alter the enthalpy of reaction.

Chemistry
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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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**Multiple Choice Question: Catalysts in Chemical Reactions**

Which of the following statements is not true about catalysts?

A) Catalysts do not change the value of an equilibrium constant.

B) Catalysts provide an alternative reaction pathway that effectively lowers the activation energy.

C) Catalysts can be recovered unchanged after a reaction completes.

D) Catalysts alter the enthalpy of reaction.

**Correct Answer Explanation:**
The correct answer is indicated in the image as option D, "Catalysts alter the enthalpy of reaction." This is incorrect because catalysts do not alter the enthalpy (total heat content) of a reaction; they only provide an alternative pathway with a lower activation energy, speeding up both the forward and reverse reactions equally without changing the equilibrium constant or the enthalpy of the system. 

**Key Details:**
- **Option A (True):** Catalysts do not alter the position of the equilibrium; they help the reaction reach equilibrium faster.
- **Option B (True):** Catalysts lower the activation energy of a reaction by providing an alternate reaction pathway.
- **Option C (True):** Catalysts remain chemically unchanged at the end of the reaction and can be reused.

There are no graphs or diagrams present in this image.
Transcribed Image Text:**Multiple Choice Question: Catalysts in Chemical Reactions** Which of the following statements is not true about catalysts? A) Catalysts do not change the value of an equilibrium constant. B) Catalysts provide an alternative reaction pathway that effectively lowers the activation energy. C) Catalysts can be recovered unchanged after a reaction completes. D) Catalysts alter the enthalpy of reaction. **Correct Answer Explanation:** The correct answer is indicated in the image as option D, "Catalysts alter the enthalpy of reaction." This is incorrect because catalysts do not alter the enthalpy (total heat content) of a reaction; they only provide an alternative pathway with a lower activation energy, speeding up both the forward and reverse reactions equally without changing the equilibrium constant or the enthalpy of the system. **Key Details:** - **Option A (True):** Catalysts do not alter the position of the equilibrium; they help the reaction reach equilibrium faster. - **Option B (True):** Catalysts lower the activation energy of a reaction by providing an alternate reaction pathway. - **Option C (True):** Catalysts remain chemically unchanged at the end of the reaction and can be reused. There are no graphs or diagrams present in this image.
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