Multiple Choice
A catalyst increases the rate of a chemical reaction by:
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15. Chemical Kinetics
Catalyst
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Which of the following statements is true regarding the energy diagram provided?
i. The reaction is endothermic.
ii. Activation energy would be less than + 10 kJ after a catalyst is added.
iii. The reaction absorbs energy.
iv. Activation energy would be greater than + 10 kJ after a catalyst is added.
A
I only
B
II only
C
I and III
D
II, III and IV
Verified step by step guidance1
Examine the energy diagram: The y-axis represents enthalpy, and the x-axis represents the reaction coordinate. The curve shows the energy changes during the reaction.
Identify the initial and final states: The initial state is at a higher enthalpy level than the final state, indicating that the reaction releases energy.
Determine if the reaction is endothermic or exothermic: Since the final state is at a lower enthalpy than the initial state, the reaction is exothermic, not endothermic.
Evaluate the activation energy: The peak of the curve represents the transition state. The difference in enthalpy between the initial state and the transition state is the activation energy.
Consider the effect of a catalyst: A catalyst lowers the activation energy, so if the original activation energy is greater than +10 kJ, adding a catalyst could reduce it to less than +10 kJ.
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