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CHEM-6 Midterm: Chem 6 Dartmouth Spring Exam2

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turquoisegnu128

31 Jan 2019

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Dartmouth College

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Chem 6 sample exam 2 (150 points total) @ this is a closed book exam to which the honor. @ the last page contains equations and physical constants; you can detach it for easy reference. @ please write clearly and show your work. If you need to write on the back of the exam paper, please indicate this clearly. @ some questions are more challenging than others. Allot your time accordingly, and try to answer. @ please put your name both on this page and on page 2. Total (150 pts)==========: (12 pts, 6 each) hydrogen atoms are the overwhelming majority of atoms in most stars and in interstellar space. In the carina nebula, transitions due to h atoms in extremely excited states are observed. For example, the n = 253 ---> n. = 252 transition has been studied by astronomers: (8 pts) find the frequency of the photon emitted in this transition.

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Related Questions

Need help with #2

Electrochemistry. Please show work, label all answers clearly, and write legibly. Standard reduction potentials are found in Appendix E of your textbook On your paper, at the TOP, write (a) the FULL NAME of your TA; and (b) your section as "SECTION ##". Failure to do this will result in a deduction of I pt The following diagram, called a Latimer diagram, summarizes the standard reduction potentials for various nitrogen-containing compounds and ions in acidic aqueous solution. It contains useful data for this HW set. 0.97 V 0.79 V 1.12 V 1.00 V 1.59 V 1.25 V 0.89 V An arrow represents the "properly balanced reduction half-reaction" between the oxidized species on the left and the reduced species on the right of the arrow. The potential value over each arrow is the standard reduction potential E'ned for that properly balanced half-reaction. For example, from this diagram, you can write No, (aq) + e + 2 H+(aq)-â NO2(g) + H20(/); E0ted _ +0.79 V (1) (18 pts) When H S(g) is bubbled into nitric acid solutions, S(s), NOg), NO(g), N2(g), and NH4 (a) all form. (a) (8 pts) Write the four balanced reactions that describe this complex process. (b) (8 pts) For each reaction in part (a), calculate the standard emf (in V) (c) (2 pts) Which of the four reactions has the greatest driving force and which has the least driving force per electron (2) (16 pts) Use the Latimer diagram above for this question. (a) (6 pts) NO (g) disproportionates spontaneously into nitric acid and nitrous acid in acidic media. Show this (b) (6 pts) Nitrous acid will not disproportionate spontaneously to nitrogen dioxide and nitric oxide. Show this (c) (4 pts) Given that the definition of 1 volt = 1 Joule Coulomb, show that the reduction of the nitrate ion to by writing the balanced chemical reaction and evaluating the standard emf for the reaction. by writing the balanced chemical reaction and evaluating the standard emf for the reaction. nitrogen gas in acidic media has a standard reduction potential of +1.25 V (3) (6 pts) Active metals like zinc will react with concentrated nitric acid to produce the ammonium ion and the Zn (a) ion at 25Â°C (a) (4 pts) Write the balanced chemical equation for this process using smallest whole number coefficients. (b) (2 pts) Evaluate ÎEo (V) for the reaction in part (a). (4) (6 pts) Less active metals like copper will react with concentrated nitric acid to produce nitric oxide gas and the Cu (aq) ion at 25Â°C. (a) (4 pts) Write the balanced chemical equation for this process using smallest whole number coefficients. (b) (2 pts) Evaluate AE for the reaction in part (a). BONUS (8 pts; and PRACTICE): Write all balanced half-reactions indicated by the Latimer diagram above