Unit 8, Section 2 (Test)

Which statement correctly describes this reaction?

• It is endothermic and energy is absorbed.

• It is endothermic and energy is released.

• It is exothermic and energy is absorbed.

• It is exothermic and energy is released

Which numbered interval will change with the addition of a catalyst to the system?

• 1

• 2

• 3

• 4

What is the difference between the potential energy of the reactants and the potential energy of the products?

• 20. kcal

• 40. kcal

• 60. kcal

• 80. kcal

Consider the reaction for which ΔH = + 33 kJ/mol.

N₂(g) + 20₂(g) → 2N0₂(g)

The potential energy diagram of the reaction is shown above. Which arrow represents the heat of reaction for the reverse reaction?

• 1

• 2

• 3

• 4

Which letter in the diagram represents the heat of reaction?

• A

• B

• C

• D

Which reaction would have the lowest activation energy?

• the forward catalyzed reaction

• the forward uncatalyzed reaction

• the reverse catalyzed reaction

• the reverse uncatalyzed reaction

In the potential energy diagram above, which arrow represents the potential energy of the activated complex?

• A

• B

• C

• D

What is the activation energy for the forward reaction?

• 80 kcal

• 40 kcal

• 20 kcal

• 60 kcal

Which letters in the diagram represents the activation energy of the reverse reaction?

• A&C

• C&D

• C&B

• A&D

In order for a chemical reaction to occur, there must always be

• an effective collision between reacting particles

• a bond that breaks in a reactant particle

• reacting particles with a high charge

• reacting particles with high kinetic energy