Catalysts Quiz
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5 questions, one answer each
Each answer is checked as you go, with why.
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1. What does a catalyst do in a chemical reaction?
- A. Increases the amount of product formed
- B. Speeds up the reaction without being used up
- C. Slows down the reaction on purpose
- D. Becomes part of the final product
2. How does a catalyst increase the rate of reaction?
- A. By increasing the temperature of the reaction
- B. By increasing the concentration of reactants
- C. By providing a pathway with lower activation energy
- D. By increasing the pressure of the system
3. Which of these is a biological catalyst?
- A. Manganese(IV) oxide
- B. An enzyme
- C. Hydrochloric acid
- D. Sodium chloride
4. A student wants to check whether a substance added to a reaction is a catalyst. What should they check?
- A. That it appears in the products of the reaction
- B. That its mass increases during the reaction
- C. That it is chemically unchanged and the same mass at the end
- D. That the reaction slows down when it is added
5. Using collision theory, why does raising the temperature increase reaction rate more than raising the concentration alone?
- A. It only increases collision frequency, like concentration does
- B. It increases collision frequency and the energy of collisions
- C. It has no effect on collision frequency but greatly increases energy only
- D. It reduces the number of particles needed for a reaction