PLEASE ANSWER ALL! Choose the right one. Explain in one sentence.

1.Diffusion through the narrow pores of a catalyst pellet would enhance reaction. A: True B: False

2. Knudsen diffusion occurs when the pellet pore diameter is smaller than molecule mean free path. A: True B: False

3. Activated, configurational diffusion occurs usually when pellet pore diameter is A: > 100 nm B: 4-100 nm C:

4. In the pellet, the actual path that molecule travels from A to B is shown in following figure. How much is the tortuosity?

A: 0.5 B: 1 C: 2 D: 3

5. What is the ratio of effective diffusivity (in the pellet) to bulk diffusivity, if the tortuosity is 4 and the pellet porosity is 0.5? A: 1/4 B: 1/8 C: 4 D: 8

6. When the Thiele Modulus is very large, which from the cartoons below represents better reactant the concentration of A (blue) in the catalyst pellet?

7. When the Thiele Modulus is very small, which from the cartoons below represents better reactant the concentration of A (blue) in the catalyst pellet?

8. For a first-order reaction, with internal mass transfer resistances, how would the observed reaction rate change if the pellet diameter was increased? A: Increase B: No change C: Decrease

9. For a first-order reaction, how would the observed reaction rate change if the reaction temperature was increased? A: Increase B: No change C: Decrease

10. For a second-order reaction, with internal mass transfer resistances, how would the observed reaction rate change if the reactant concentration at the external pellet surface decreased? A: Increase B: No change C: Decrease

11. For a reaction limited by internal diffusion, how would the reaction rate change if the fluid velocity was increased? A: Increase B: No change C: Decrease

12. For a reaction limited by internal diffusion, how would the observed reaction rate change if the pellet diameter was decreased? A: Increase B: No change C: Decrease

13. For a reaction limited by surface reaction, how would the observed reaction rate change if the fluid velocity was increased? A: Increase B: No change C: Decrease

14. For a reaction limited by surface reaction, how would the observed reaction rate change if the pellet diameter was increased? A: Increase B: No change C: Decrease

15. If internal effectiveness factor () is close to 1, the reaction is controlled by: A: Surface reaction B: internal diffusion C: Surface reaction and internal diffusion

16. If internal effectiveness factor () is 0.1, the reaction is controlled by: A: Surface reaction B: Internal diffusion C: Surface reaction and internal diffusion

17. If the Weisz-Prater parameter CWP >> 1, reactant concentration gradient within the pellet is A: Large B: Small C: Goes through a maximum

18. If the Weisz-Prater parameter CWP

19. For a first-order reaction, if Thiele modulus is 2 and internal effectiveness factor () is 0.8, whats the value of Weisz-Prater parameter? A: 0.4 B: 0.8 C: 1.6 D: 3.2

A: B: C: A: B: C