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exam1mulford - General Chemistry 142 Exam I February 6,...

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General Chemistry 142 Exam I February 6, 2008 Instructions Turn your cell phone OFF . Vibrate is NOT acceptable. The only acceptable setting is OFF . To do otherwise is to compromise the concentration of you and your peers. Show all work for problem-solving questions. If you make any mathematical assumptions, be sure to verify them clearly. Follow correct significant figure conventions. ―By signing below, I acknowledge that I have read the instructions above and pledge that I will take this exam under all standards and principles set by the Emory University Honor Council.‖ SIGNATURE: ________________ KEY ____________________________________ Printed Name: __________________________ Student ID:__________________ Section # __________________ Scantron total ________ Problem total _________ Overall ___________
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I Matching For each of the following questions chose the letter on the right that best matches the question on the left and mark you answer on the bubble sheet . You MUST use a #2 pencil and fill in the sheet properly or your answers will not be recorded and you will receive a zero. (2 points each) 1. soap P A. ion-induced dipole forces 2. sublimation D B. London forces 3. mole fraction G C. moles solute/mol solvant 4. face centered cubic E D. solid gas 5. IM force always present B 6. critical point M E. 4 atoms per unit cell F. unpaired electrons G. moles solute/mol solution H. gas liquid I. moles solute/kg solution K. 2 atoms per unit cell M. condition where liquid and gas states merge into one N. gas solid O. conditions where all three states of matter are present P. molecule with polar and non-polar ends II Multiple Choice Chose the most correct answer for each of the following and note the question numbers. Mark you answer on the bubble sheet! (4 points each) Use the phase diagram on the right to answer the following three questions. 7. What is the vapor pressure of the solid at -60°C. a. 0.4 atm b. 4 atm b. 10 atm d. 40 atm 8. What phase change occurs when this substance at 40 atm pressure is heated from -80°C to -40°C. a. solid to liquid b. solid to gas c. liquid to gas d. liquid to critical fluid 9. A sample of this substance at its triple point temperature is compressed. During compression, which phase change could not occur? a. solid to liquid b. liquid to solid c. gas to solid d. solid remains solid
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3 10. Which best describes the packing of ions in the Zinc Blende structure? A . fcc array of Zn 2+ with S 2- in one half of the tetrahedral holes B. fcc array of Zn 2+ with S 2- in all of the tetrahedral holes C. fcc array of S 2- with Zn 2+ in one half of the tetrahedral holes D. fcc array of Zn 2+ with S 2- in all of the octahedral holes E. fcc array of Zn 2+ with S 2- in one half of the octahedral holes 11. Which of the following forces are intermolecular? I.
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This homework help was uploaded on 04/18/2008 for the course CHEM 142 taught by Professor Mulford during the Spring '08 term at Emory.

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exam1mulford - General Chemistry 142 Exam I February 6,...

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