Activation energy and catalysis Quiz
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5 questions, one answer each
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1. The gradient of a graph of ln k against 1/T is −5200 K. What is Ea?
- A. −43.2 kJ mol⁻¹
- B. 625 J mol⁻¹
- C. 43.2 kJ mol⁻¹
- D. 5.2 kJ mol⁻¹
2. Which graph gives a straight line from Arrhenius data?
- A. k against T
- B. ln k against 1/T
- C. ln k against T
- D. k against 1/T
3. How does a solid heterogeneous catalyst speed up a gas-phase reaction?
- A. It raises the energy of reactant molecules
- B. It dissolves in the reactant mixture
- C. It increases the number of reactant particles
- D. Reactant molecules adsorb on its surface, weakening their bonds
4. Why is an industrial solid catalyst used as small pellets or a fine powder?
- A. It has a larger surface area, so more active sites
- B. Smaller particles lower the activation energy further
- C. Powders dissolve in gases
- D. Pellets increase the temperature
5. A reaction has Ea = 80.0 kJ mol⁻¹. By what factor does k increase when the temperature rises from 300 K to 310 K?
- A. 1.3
- B. 2.8
- C. 10
- D. 80