Catalysis and surface chemistry

4. Adsorption ------- with pressure, reaches a maximum, and becomes constant.
5. The juice extracted from the cane is treated with animal charcoal for the ----- of the coloring agent.
6. The two primary methods used for predicting the adsorption capacity of a given material are known as the ------and Langmuir isotherms.
8. ------cannot be reversed and occurs at high temperatures initially; specific in nature.
11. ...... the catalyst is present in the same phase as the reactants.
14. substances upon whose surface the change of concentration occurs is called .....
15. poisonous gases get ---- at the surface of the coal.
17. The accumulation of molecules on a surface.
18. retards the rate of a chemical reaction.
20. The catalyst is ....... chemically at the end of the reaction.

1. releasing heat as surface energy decreases (∆H is negative).
2. ........ Manufacture of ammonia using iron as a catalyst.
3. Does adsorption increase with temperature?
7. The common surface between the two phases where the adsorbed molecules concentrate is called the ......
9. It means constant temperature.
10. --- by which molecules or atoms are released from a solid surface into a gas or liquid phase.
12. ----- is a substance that changes the speed of a reaction.
13. ----- Weak, van der Waals forces hold molecules to the surface.
16. Chemistry is the study of the chemical phenomena that occur at the surface.
19. -----is a bulk phenomenon, while adsorption is a surface phenomenon.