Multiple Choice
Which process would speed up a reaction rate by decreasing the activation energy?
15. Chemical Kinetics
Catalyst
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
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.
1:59mWatch next
Master Catalyzed vs. Uncatalyzed Reactions with a bite sized video explanation from Jules
Start learningRelated Videos
Related Practice
