PRACTICE EXAM QUESTIONS 1. Using the compounds below: A. Arrange the compounds f

Question

PRACTICE EXAM QUESTIONS 1. Using the compounds below: A. Arrange the compounds from most reduced to most oxidized (from left to right). B. Arrange the compounds from best electron donor to worst electron donor (from left to right). C. Explain and relate the two trends you see from A and B above. 2. Compare the G you calculated for Homo sapiens and Desulforudis audacviator The elec- tron donors for both organisms sit very close together on the redox tower yet the AG is very different. ain why the 0is very different. (Hint: Look at the electron acceptors.) B. What does the difference in G mean for these two organisms? Which organism needs to 'eat' more often? 3. The G of ATP hydrolysis is negative and the change in entropy is positive. Overall, this reaction: A. requires energy B. is endergonic C. is exergonic Explain why the G is negative. 24

Explanation / Answer

1. A.

Most reduced form is ethane (C2H6) and the most oxidizes form is carbon dioxide (CO2). Oxidized state is described by the number of CH bond which is replaced by CX bond.

CH3 - CH3 > CH3-CH2-OH > CH3CHO > HCOOH > CO2

B. More reduced compounds are the best electron donors

CH3-CH3 > CH3-CH2-OH > CH3CHO > HCOOH > CO2

C. Alkanes have H2 and can donate it during reactions. When it donates electrons are also released and it will be converted to an oxidized state. Hence the presence of O in an organic compound will make it more electron acceptor (electronegative). Presence of H makes the compound more electropositive.

More CX, more oxidized and electron acceptor.

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