BCHM 310- Midterm Exam Guide - Comprehensive Notes for the exam ( 19 pages long!)
5 Oct 2017
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Nonpolar compounds force energetically unfavorable changes in the structure of water. Clatharates: crystalline compounds of nonpolar solutes and water. Micelles: may contain hundreds or thousands of molecules. Van der waals interactions are weak interatomic interactions. Van der waals interactions : uncharged atoms that are close together their surrounding electron clouds influence each other --transient dipoles created weakly attract eachother bringing the two nuclei together. Van der waals broken down: random variations in electron position around one nucleus may create a transient electric dipole which induces a transient opposite electric dipole in the nearby atom --- the two dipoles weakly attract each other. Van der waals radius: a measure of how close that atom will allow another to approach. Weak interactions are crucial to macromolecular structure and function. No(cid:374)co(cid:448)ale(cid:374)t i(cid:374)teractio(cid:374)s like are all (cid:373)uch (cid:449)eaker tha(cid:374) co(cid:448)ale(cid:374)t i(cid:374)teractio(cid:374)s. However, in spite of being weak their cumulative effect is very significant.
