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

400 300 g 200 100 Uncatalyzed Reaction Reaction coordinate products

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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?

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.

Part E

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

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

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

Answer

A)

Activation energy = energy of activated complex - energy of reactant

= 400 KJ - 225 KJ

= 175 KJ

Answer: 175 KJ

B)

Enthalpy change = energy of product - energy of reactant

= 100 KJ - 225 KJ

= -125 KJ

Answer: -125 KJ

C)

Activation energy of reverse reaction = energy of activated complex - energy of product

= 400 KJ - 100 KJ

= 300 KJ

Answer: 300 KJ

D)

Enthalpy change of reverse reaction = energy of reactant - energy of product

= 225 KJ - 100 KJ

= 125 KJ

Answer: 125 KJ

E)

Catalyst has decreased the Activation energy

Answer: option 2

F)

Catalyst do not effect the Enthalpy change

Answer: option 3

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