Catalysts Quiz
Studying this course? Keep your progress in one place.
Pick an answer for each. Quizzes never use energy.
5 questions, one answer each
Each answer is checked as you go, with why.
See all 5 questions
1. Which statement about a catalyst is correct?
- A. It is used up in the reaction
- B. It provides an alternative route with a lower activation energy
- C. It increases the enthalpy change of reaction
- D. It shifts the curve to higher energy
2. On a Maxwell–Boltzmann distribution, what happens when a catalyst is added at constant temperature?
- A. The curve stays the same and the activation energy moves to the left
- B. The peak moves to the right
- C. The curve moves to the left
- D. The area under the curve increases
3. A catalyst lowers the activation energy of a reaction from 95 to 60 kJ mol⁻¹. The enthalpy change is −30 kJ mol⁻¹ without the catalyst. What is it with the catalyst?
- A. −65 kJ mol⁻¹
- B. +5 kJ mol⁻¹
- C. −30 kJ mol⁻¹
- D. −60 kJ mol⁻¹
4. What does the area under a Maxwell–Boltzmann curve represent?
- A. The activation energy
- B. The rate of reaction
- C. The mean energy
- D. The total number of molecules
5. Why does a catalyst increase the rate of a gas-phase reaction at constant temperature?
- A. A greater proportion of molecules have energy equal to or greater than the lower activation energy
- B. The molecules move faster
- C. The molecules have a higher average energy
- D. The collisions become more energetic