11.20 (1)

11.20 (1) - structure described—part of it wants to be in...

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Key: The key to understanding this problem is to know how bubbles form. Bubbles are thin layers of water surrounded on the inside and out with molecules that are polar or hydrophilic on one end, and non polar, or hydrophobic on the other end. The trick then, is to locate all of the molecules that are hydrophilic on one end and hydrophobic on the other, which is all of them. Of course, the only way you can know this is if you have memorized the definitions of the types of molecules listed. A surfactant is a surface-active agent (that’s where the name comes from), and it’s surface-active because it has the very kind of
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Unformatted text preview: structure described—part of it wants to be in the solvent (like dissolves like) and the other part of the surfactant molecule doesn’t. A typical surfactant is a long-chain alkane with a polar head group on one end of the molecule. Many fatty acids are exactly of this structure, but some are unsaturated (contain double bonds in the carbon chain). Among the unsaturated fatty acids are trans-type, meaning that the chain continues on the same side of the double bond. A detergent is a surfactant which has SO 3-as its head group....
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This document was uploaded on 11/04/2011 for the course CHEM 106 at BYU.

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