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Chemistry 331 Exam 1 - September 29th, 2007 - Prof. Charles Sharpless, Exams of Chemistry

A chemistry exam from september 29th, 2007, for the course chemistry 331. The exam consists of multiple-choice questions and calculations related to topics such as coal gasification, photosynthesis, fractional distillation, bond energies, and the steady-state model for earth’s temperature. Students are required to answer short-answer questions and perform calculations, showing all work.

Typology: Exams

Pre 2010

Uploaded on 08/13/2009

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September 29th, 2007 Chemistry 331 50 minutes
Exam 1
Possibly Useful Information
tres = C / F P = P0e-(MW x gh / RT) PV = nRT
Efficiency < 1 – (Tc / Th) R = 0.0821 L atm mol-1 K-1 OR 8.314 J mol-1 K-1
Part A: Short answer, 8 points each. Six sentences or less!
1) Match the items on the left to the most appropriate term on the right.
Coal gasification
Making gasoline by heating higher
boiling fractions in the absence of air
Respiration
Fluidized bed combustion
The biological conversion
of organic carbon to CO2 Primary energy use
Photosynthesis
Reacting coal with hot steam
to make methane
Fractional distillation
Cracking
Energy obtained directly
from a fuel source Endothermic
Enhanced recovery
2) What is tar sand? How is fuel obtained from it?
3) Explain how gas influx into the atmosphere can be a zero-order chemical process.
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September 29 th, 2007 Chemistry 331 50 minutes Exam 1

Possibly Useful Information

t (^) res = C / F P = P 0 e -(MW x gh / RT)^ PV = nRT Efficiency < 1 – (T (^) c / T (^) h) R = 0.0821 L atm mol -1^ K-1^ OR 8.314 J mol-1^ K-

Part A : Short answer, 8 points each. Six sentences or less!

  1. Match the items on the left to the most appropriate term on the right.

Coal gasification Making gasoline by heating higher boiling fractions in the absence of air Respiration Fluidized bed combustion The biological conversion of organic carbon to CO 2 Primary energy use Photosynthesis Reacting coal with hot steam to make methane Fractional distillation Cracking Energy obtained directly from a fuel source Endothermic Enhanced recovery

  1. What is tar sand? How is fuel obtained from it?

  2. Explain how gas influx into the atmosphere can be a zero-order chemical process.

  1. Briefly describe the main elements of the steady-state model for earth’s temperature with explicit reference to the solar flux, albedo, and the wavelengths of radiation involved in the energy balance.

  2. What factors determine how much radiative forcing a gas will introduce to the atmosphere?

Part B : Calculate this! 20 points each. Show all work.

  1. Use the bond energies on the last page of this exam to calculate the moles of CO 2 produced per 1000 kJ when one mole of ethanol (CH 3 -CH 2 OH) is combusted completely to CO 2 and H 2 O.

Bond Energies