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Chemistry midterm 3 review

by: fehlman.1 Notetaker

Chemistry midterm 3 review Chemistry 1220

Marketplace > Ohio State University > Chemistry > Chemistry 1220 > Chemistry midterm 3 review
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Chemistry 1220
Dr. Loza
Study Guide
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This 3 page Study Guide was uploaded by fehlman.1 Notetaker on Sunday April 3, 2016. The Study Guide belongs to Chemistry 1220 at Ohio State University taught by Dr. Loza in Winter 2016. Since its upload, it has received 84 views. For similar materials see Chemistry 1220 in Chemistry at Ohio State University.


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Date Created: 04/03/16
Chemistry Midterm 3 review practice 1. What is the Ksp expression for AgCl(s) dissociation? 2. The solubility of LiOH is 70.6 g/L. What is its molarity? 3. True or False a. A larger Ksp value equates to a more soluble salt. b. Temperature does not effect solubility c. The presence of other solutes effects solubility 4. What is the general Ksp expression for A 2B(using x)? 5. Find the molar solubility of AgBr in 9M NH3.The Ksp= 5.0*10^-13. Kf=2.0*10^12 6. In AgCl, with [Ag] = 0.678M and [Cl] = 0.546M, will AgCl precipitate given Ksp= 1.8*10^-8? 7. If Ca(OH)2 (ksp=1.3*10^-5) and Co(OH)2 (ksp=2.5 *10^-16) are both in solution in which precititation is occurring. Which substance will precipitate first? 8. What is the equilibrium constant of a compound with a Gibbs free energy value of -2384.7J? (standard temp and pressure) 9. What is the change in entropy for the combustion reaction of: CH4(g) +2O2(g) CO2(g)+2H2O(l)? Entropy values are as follows… CH4=186.3 J/mol k O2=205 j/mol k CO2= 213.6 J/mol k H2O=69.91 J/mol k 10. In the equation in which BaSO4(s)+2HCl(aq)BaCl2(aq) + H2SO4(aq) Has the entropy increased, decreased or stayed the same? 11. Tell whether or not the reaction will be spontaneous or not a. Change in entropy is +, Change in enthalpy is + b. Change in entropy is -, Change in enthalpy is + c. Change in enthalpy is -, change in enthalpy is – 12. Will a reaction be spontaneous at standard temperature and pressure if its change in enthalpy is -178.9 Kj/mol and the change in entropy is 79.9 J/mol K? 13. Determine the boiling point if substance “A” goes from liquid to gas and has a change in entropy of -67.3 J/mol K and a change in enthalpy of -43.6 KJ/mol 14. In a voltaic cell, which direction do electrons move? 15. Anode is ________ and represented by oxidation Cathode is _________ and represented by reduction 16. A cathode has a reduction potential of 0.786V and a anode has a reduction potential of -1.24V. What is the cell potential? 17. Given that the reduction potential of Cr+3 is-0.74 V and the reduction potential of Zn+2 is -0.763 V. Which is more easily oxidized?, reduced? 18. In a single cell equation of Li+1(aq)+e-Li(s), what is the n value for this equation? 19. Does a negative cell potential value correspond to a spontaneous reaction? 20. If EMF is at equilibrium in a single cell equation that involves the transfer of two electrons and has a cell potential of –0.965V, What is the Q value? Answer key:1.ksp=[Ag+1][Cl-], 2.10.17M, 3. True,false,true 4. 4x^3, 5. 5.0M, 6.Yes, a precipitate will form, 7.Co(OH)2, 8. 0.382, 9. -243 J/ mol k, 10. Entropy stays the same, 11.a. spontaneous above certain temps b. always spontaneous c. spontaneous below certain temps, 12. Yes, 13. 375 degrees C, 14. Electrons move from anode to cathode, 15. Negative, positive, 16. 2.03 V, 17. Cr+3 is more easily oxidized, Zn+2 is more easily reduced, 18. 1,, 20.4.00*10^32


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