15. How does delocalization help to make a carboxylic acid more acidic?

16. Where is the negative charge after a carboxylic acid has dissociated?

17. What is a fatty acid? Are fatty acids water-soluble? Why, or why not? What happens when a fatty acid is mixed with water?

18. What are the salts of fatty acids and alkali metal cations called? How do such salts work, and what makes them useful to us?

19. In what sense is a fatty acid anion a more exaggerated version of a long-chain alcohol molecule?

20. What is the structure of the bilayer in a soap film? What produces the colours in a soap bubble? Why does the bubble thicken at the bottom and eventually burst? Does the initial rupture of the film occur at the bottom, or the top, of the bubble?

21. How do soaps operate as cleaning agents?

22. What is esterification? What is the reverse action called?