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Unformatted text preview: YOUR NAME HERE October 4, 2006 Chem 120B Midterm #1 Definitions and Useful Formulas: Boltzmann distribution: p j = e- E j Q Partition function: Q = summationdisplay j e- E j Average energy: ( E ) = parenleftbigg ln Q parenrightbigg N,V Heat capacity: C V = parenleftbigg ( E ) T parenrightbigg N,V = ( ( E ) 2 ) k B T 2 Noninteracting, indistinguishable molecules: Q = q N N ! Equipartition principle: ( E ) = n 2 k B T, where n is the number of quadratic contributions to the energy. Boltzmanns definition of entropy: S = k B ln W For an open cylinder with radius r and length L : volume = r 2 L, surface area = 2 rL Some properties of logarithms and exponentials: ln x + ln y = ln xy, a ln x = ln x a e a e b = e a + b , e a ln x = x a 1 This exam consists of 2 questions (both with several parts) on 8 pages. All concern a double-stranded nucleic acid. A small portion of its chemical structure is shown below. 1. The double helix structure is stabilized by binding of bases along one molecule to complementary bases along the other molecule. The picture below highlights this base-pair binding....
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This note was uploaded on 04/02/2008 for the course CHEM 100 taught by Professor Barakos during the Spring '08 term at Berkeley.
- Spring '08