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. What is a catalyst?
- A. A substance used up in a reaction
- B. A substance that speeds up a reaction without being used up
- C. A type of reactant
- D. A product of a reaction
2. How does a catalyst increase reaction rate?
- A. By increasing activation energy
- B. By providing a pathway with lower activation energy
- C. By increasing the mass of reactants
- D. By cooling the reaction down
3. What happens to the overall energy change of a reaction when a catalyst is used?
- A. It increases
- B. It decreases
- C. It stays the same
- D. It becomes zero
4. Why does a lower activation energy pathway increase the rate of reaction?
- A. Fewer particles collide
- B. More particle collisions have sufficient energy to react
- C. The reaction becomes exothermic
- D. Particles move more slowly
5. Two identical reactions are carried out, one with a catalyst and one without. Which statement correctly compares their energy level diagrams?
- A. Both have the same activation energy but different overall energy change
- B. The catalysed reaction has a lower activation energy hump but the same start and end energy levels as the uncatalysed reaction
- C. The catalysed reaction has a higher activation energy hump
- D. The catalysed reaction ends at a lower energy level than the uncatalysed reaction