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General Chemistry II Exam 4 Practice Exam

by: Oluwatobi Aderotoye

General Chemistry II Exam 4 Practice Exam CHEM 004

Marketplace > Howard University > Chemistry > CHEM 004 > General Chemistry II Exam 4 Practice Exam
Oluwatobi Aderotoye
GPA 3.62

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About this Document

Practice Problems for Exam covering chapters 19-21 of Chemistry: The Central Science book.
Gen Chem II (Chem Majors)
Dr. Raghavan
Study Guide
Thermodynamics, Electrochemistry, Nuclear Chemistry
50 ?




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This 2 page Study Guide was uploaded by Oluwatobi Aderotoye on Sunday April 17, 2016. The Study Guide belongs to CHEM 004 at Howard University taught by Dr. Raghavan in Fall 2016. Since its upload, it has received 23 views. For similar materials see Gen Chem II (Chem Majors) in Chemistry at Howard University.


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Date Created: 04/17/16
Gen. Chem. Lect. Test #4 Spring  2015 Time : 10.10­11.00 am Total 100 points Last Name First Name I.D. Section No. Attempt all questions.    To earn full points, show your calculations Multiple Choice: 1) How many electrons are involved in balancing the following redox reaction MnO ­ + C O ­2 ­­­ Mn +2 + CO 4 2 4 2 A) 2 B) 5 C) 8 D) 10 2) What is the solubility of bCl 2in a 0.15 M  HCl solution? The  K  of PbCl 2 is1.610 5. sp A)  2.010 3 B) 1.110 4 C) 1.810 4 D) 7.110 4 E) 1.610 5 . 3) In which of the following aqueous solutions would you expect AgBr to have the lowest solubility?  A) pure water B) 0.20 M NaBr  C) 0.10 M  AgNO D) 0.15 M NaBr  3 4) The solubility of  (Mn(OH) ) 2  is2.210  M5 . What is the  K sp  of Mn(OH) 2 ?  A)  1.110 14B)  4.310 14C)  2.110 14D)  4.810 10E) 2.210 5    5) The normal boiling point of C 2 3 3 is 47.6 °C and H  isv27.49 kJ/mol. What is the change  in entropy in J/K when 28.6 grams of C C2 3 3condenses to a liquid at the normal boiling point?  a) ­13.1  b) ­4.19  c) 4.19  d) 13.1  6) For a reaction to be spontaneous at only high temperatures, the sign of H  must be  o  _____  and S  must be _____ (a) –ve, ­ve (b) +ve, +ve (c) (a) –ve, +ve (d) +ve, ­ve 7) The entropy of a purely perfectly crystalline substance is zero at (a) 273 C (b) ­273 K (c) ­273 C (d) 273 K 8) The standard cell potential (E°cel) for the reaction below is +1.10 V. The cell potential for the  reaction at 298K  is __ V when concentration of  [Cu ]1.010  M 5  &  [Zn ]1.0 M   2 2 Zn (s)Cu (aq) Cu (s)Zn (aq) A) 1.40  B) 1.25 C) 0.95 D) 0.80  E) 1.10  9) Which species is the oxidizing agent in the following reaction: Cr O2 726S O2 3214H  2Cr 3S O3 4 627H O2 A) Cr 2 7­2 B) S2O 32 C)  H + D) S4O 62 10) For which phase transition do you expect maximum increase in entropy (i) Melting  (ii) Freezing  (iii) Boiling (iv) Condensation    #2 A solution contains 0.2 M CrO , 4.1M CO , an3 0.01M Cl.  AgNO  is added3 which  ion will precipitate first, second and third?  State which ions will selectively precipitate? (Ksp = 1.2 x 10  (Ag CrO ) 2 Ksp 4 8.1 x 10  (Ag CO ); 1.8 x 102 (AgC3)) ­10 #3) What is the pH of the solution in the cathode compartment for Zn Zn  H  H  cell when 2 + 2 p H2 1.0 atm, [Zn ] = 0.1 M and the cell emf is 0.542 V?  +2 ­  0 + Zn  +2e  Zn E  = ­0.76V; 2H  + 2e­  H  E  = 0V  2 o #4) A constant current of 1.25 amp is passed through an electrolytic cell containing a 0.05 M  solution of CuSO  and a copper anode and a platinum cathode until 2.10 g of Cu is deposited.   4 How long does the current flow to obtain this deposit? #5 For the reaction CH (g) 4 1/2O (g) ­­­2­  CH OH(g)  3 CH (4) O 2(g)  CH O3(g)  H  (fJ/mol) at 25oC ­74.8 247.5 ­201.2  o S  fJ/molK) at 25oC 186.3 161.0   237.6 o o (a) Calculate the H  and S  for this reaction? (b) Is the reaction spontaneous at 298K? (c) Is there a temperature at which the reaction is at equilibrium? Bonus  Will Ag SO precipitate when 100ml of 0.05M AgNO  is mixed with 10 ml of 0.05M Na SO ?    2 4  3 2 4 Ksp(Ag SO 2 =145 x 10 . ­5


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