Potential Energy Diagrams 1

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1. Given the following potential energy diagram and the reaction A + B + 20 kJ → C. If the activation energy for the forward reaction is 60 kilojoules, then the activation energy for the reversereaction is *

A) 30 kJ

B) 40 kJ

C) 20 kJ

D) 60 kJ

2. The graph below is a potential energy diagram of a compound which is formed from its elements. What interval represents the heat of reaction? *

3. The diagram below represents a potential energy diagram of a chemical reaction. Interval B represents the *

A) potential energy of the reactants

B) activated complex D) activation energy

C) potential energy of the products

D) activation energy

4. The activation energy for the reverse reaction is represented by *

5. The potential energy diagram below represents the reaction R + S + energy → T. What numbered interval represents the potential energy of the product T? *

6. The graph below represents the potential energy changes that occur in a chemical reaction.What letter represents the activated complex? *

7. Which potential energy diagram represents the reaction A + B → C + energy? *

8. According to the potential energy diagram shown below for the reaction A + B → C + D, the activation energy is highest for the *

A) forward reaction, which is exothermic

B) forward reaction, which is endothermic

C) reverse reaction, which is exothermic

D) reverse reaction, which is endothermic

9. According to the potential energy diagram shown below, the chemical reaction in the forward direction is *

A) endothermic because it absorbs energy

B) exothermic because it absorbs energy

C) exothermic because it releases energy

D) endothermic because it releases energy

10. Activation energy is required to initiate *

A) exothermic reactions, only

B) neither exothermic nor endothermic reactions D) endothermic reactions, only

C) both exothermic and endothermic reactions

D) endothermic reactions, only

11. A catalyst changes the rate of a chemical reaction by lowering the *

A) potential energy of the reactants

B) potential energy of the products

C) activation energy of the reaction

D) heat of the reaction

12. The reaction A(g) + B(g) → C(g) + D(g) + 30 kJ has a forward activation energy of 20 kJ. What is the activation energy for the reverse reaction? *

A) 20 kJ

B) 10 kJ

C) 30 kJ

D) 50 kJ

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