Catalysts & Rate of Reactions Quiz
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5 questions, one answer each
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1. What is a catalyst?
- A. A substance used up in a reaction to speed it up
- B. A substance that speeds up a reaction without being used up
- C. A reactant that lowers the yield of a reaction
- D. A substance that only slows down reactions
2. Which catalyst is used in the Haber process to make ammonia?
- A. Vanadium(V) oxide
- B. Manganese(IV) oxide
- C. Iron
- D. Platinum
3. How does a catalyst increase the rate of a reaction?
- A. By increasing the temperature of the reactants
- B. By providing a reaction pathway with lower activation energy
- C. By increasing the concentration of reactants
- D. By increasing the pressure of the system
4. Why do industrial processes often use catalysts?
- A. To increase the mass of the product
- B. To allow lower temperatures to be used, reducing energy costs
- C. To make the reaction irreversible
- D. To remove the need for pressure control
5. A student claims that using a catalyst increases the total yield of product from a reaction. Is this correct?
- A. Yes, catalysts always increase yield as well as rate
- B. No, a catalyst only increases the rate of reaction; it does not change the yield
- C. Yes, but only in exothermic reactions
- D. No, a catalyst decreases both rate and yield