Cheinistr 271 section 22.30; Exam 10/5ng 2/?
1. 20 ts Multi 1e choice: Circle the sin le best answer for each uestion
(a; 4 pts) The Henderson—Hasselbach relationship is
Always true, not always useful
(b) A useful shortcut for calculating pH when eit
1. DNA Thermodynamics (25 pts)
The formation of the double—stranded DNA 20-mer oligonucleotide below from the separated single
strands has been measured to proceed with AH° = —128 kcal/mole and AS° = —346 cal/moleK.
Assume a total strand concentration of
Chemistr 271. section 22xx Exam ll 4/7/2010 21'?
1. 112 pts) Multiple choice: Circle the single best answer for each Question
(A; 4 pts) The “predominant configuration” is
a. The microstate that has the most uniform distribution of energy.
b. The micros
Short Answer (27 pts)
(a; 3 pts) One word to explain why it is that sometimes the electrochemical reaction that one observes
the one that one would th ink sho ul d be thermodynamically favorable:
(b; 6 pts) Eyring (tran sition
Chet tistrv 27! section Zixx Exam l 3/7/ 1
l, [20 pts) Fill in the Blanks 6 48
Read the whole sentence before you fill in the blanks.
(a: 2 pts) KL. and KI. are equal ifthe Aug 2; 56 m a 14 does not
change during the reaction.
(b; 2 pts) The value of
Universityof Maryland, College
You have50 minutes this exam.
Examswrittenin pencilor erasable will not be re-graded
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l. ltil ':irc ’ ta w f 'n
(a; 4 gts) Stratification in sediments or the water column comes about because
he best available terminal electron acceptor is used by the local ﬂora and fauna until it’s gone.
(2) microorganisms hav
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Chemistry 27] , section 22XX Final Exam: 12f15t09 “"' 2112
1. Multiple Choice [48 ptst: Read carefully and circle the single best answer for each.
(a; 4 pts) The law of detailed balance or micrOSCOpic reversib
Chemistr 271 section 2330: Final Exam 12 14 10 - 10
1. Multi le Choice 24 ts
(i, 4 pts) The Third Law of Thermodynamics gives us a reference state of zero entropy. What else is
necessary for measuring absolute entropies of pure substances at non-zero temp
Chemistry 271, Sections 22xx Exam II, 11/4/09
(20 pts) Multiple choice: Circle the single best answer for each question
(a; 4 pts) The Boltzmann distribution refers to the distribution of
microstates over configurations.