Learning Goal: To help you understand how to interpret potential energy diagrams

Question

Learning Goal: To help you understand how to interpret potential energy diagrams. The graphs shown here are called potential energy diagrams. They show the potential energy of a system as it changes from reactants to products. The first graph shows the uncatalyzed reaction (Figure 1) ; the second graph shows the catalyzed reaction (Figure 2) .

Part A

What is the value of the activation energy of the uncatalyzed reaction?

Express your answer to three significant figures and include the appropriate units.

Part B

What is the value of the enthalpy change of the uncatalyzed reaction?

Express your answer to three significant figures and include the appropriate units.

Part C

What is the value of the activation energy of the uncatalyzed reaction in reverse?

Express your answer as an integer and include the appropriate units.

Part D

What is the value of the enthalpy change of the uncatalyzed reaction in reverse?

Express your answer to three significant figures and include the appropriate units.

How does the presence of a catalyst affect the activation energy of a reaction?

It depends on whether you are talking about the forward or the reverse reaction.

Part F

How does the presence of a catalyst affect the enthalpy change of a reaction?

How does the presence of a catalyst affect the enthalpy change of a reaction?

a-A catalyst increases the activation energy of a reaction. b-A catalyst decreases the activation energy of a reaction. c-A catalyst does not affect the activation energy of a reaction.

It depends on whether you are talking about the forward or the reverse reaction.

Part F

How does the presence of a catalyst affect the enthalpy change of a reaction?

How does the presence of a catalyst affect the enthalpy change of a reaction?

a- A catalyst increases the enthalpy change of a reaction. b- A catalyst decreases the enthalpy change of a reaction. c-A catalyst does not affect the enthalpy change of a reaction. d-It depends on whether you are talking about the forward or the reverse reaction.

Explanation / Answer

For Part E - A catalyst decreases the activation energy of a reaction.

For Part F - A catalyst does not affect the enthalpy change of a reaction.

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