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CHEM 1602 S19 Exam 3 VANDERBILT.
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__________________________________________NAME (Please PRINT)Chem 1602 Examination 3 Spring, 2019
I pledge on my honor that I have neither given nor received improper aid on
this examination.
J.W. Gibbs
(1839-1903)
________________________________________________________
(Signature)
Directions:
1. Turn over your exam and PRINT your name across the top of the back page of the exam.
2. No books, notes or digital media may be used during this test. Additionally, you may only use a
non-programmable calculator on the exam. There should be no data stored on your calculator,
including, but not limited to, periodic tables and chemical equations and formulas. No phones,
tablets, PDA’s or computers are to be used during the exam. Your phone must be turned to silent,
and stored in your backpack.
3. There are a total of 5 sections for a sum of 100 points. (31 questions on 8 pages).
4. Write your final answers clearly and legibly in the box provided. Answers not clearly written or
ambiguous answers will be marked wrong.
5. Be certain that, whenever applicable, show your work and include all relevant units. Problems
answered without showing work in Section 5 will receive NO credit.
6. Be certain to read each problem carefully! No question is written to be intentionally misleading.
7. IF you have a question, please ask your professor or one of the proctors.
4 DO NOT REMOVE THIS PAGE FROM YOUR EXAM!!!!! 3
Place a check in the box by the section for which you are officially enrolled:
Polavarapu – Section 01, MWF 9:10-10:00 am Todd – Section 02, TR 8:10-9:25 am
Rosenthal – Section 03, MWF 12:10-1:00 pm
© T. Todd, S. Rosenthal, M. Stone, and P. Polavarapu
Exam Score =
Students do not have permission to share or distribute this exam, this includes but is not limited to sharing via ANY
electronic medium.
This study source was downloaded by 100000869267694 from CourseHero.com on 07-12-2023 04:07:45 GMT -05:00
https://www.coursehero.com/file/104028941/CHEM-1602-S19-Exam-3pdf/
, 2
SECTION 1. (18 pts total; 2 pts each) TRUE/FALSE
For each statement below, circle either TRUE or FALSE.
1. DSsurroundings decreases for an endothermic reaction. TRUE FALSE
2. If a process is non-spontaneous at room temperature but becomes TRUE FALSE
spontaneous at a much higher temperature, then DH˚ and DS˚ must both
be positive.
3. A mixture of 100 mL of 1.0 M HNO2 with 100 mL of 0.50 M KOH will act as TRUE FALSE
a buffer.
4. The 3rd Law of Thermodynamics states that the entropy of a crystalline TRUE FALSE
substance at 0˚C is zero.
5. The titration curve for the reaction between carbonic acid, H2CO3, and a TRUE FALSE
strong base would show two distinct inflection points correlating to the
two equivalence points.
(Given for H2CO3: Ka1 = 4.3 x 10-7, Ka2 = 5.6 x 10-11).
6. For the color change of any acid-base indicator, if [HIn] ≥ 10 [In-], the TRUE FALSE
solution will be the color of the acid form of the indicator.
7. DG˚rxn = 0 for any reaction at equilibrium. TRUE FALSE
8. Al(OH)3 has a higher solubility at pH = 10.00 than at a pH = 7.00. TRUE FALSE
9. ' ' TRUE FALSE
For the reaction at 25˚C: N2(g) + 3H2(g) à 2NH3(g), ∆𝐺$%& = ∆𝐺*,,-.
SECTION 2. (10 pts total; 2 pts each)
For each statement below, choose the best from >, <, =, ? (cannot determine). The first is done for you as an
example. (Note +10 > -10.) The reaction(s) are carried out under identical conditions, unless otherwise stated.
Molar Mass of H2 < Molar Mass of O2
10. Buffer capacity of a solution made by mixing Buffer capacity of a solution made by mixing
0.050 mol of HCH2O with 0.050 mol of NaCH2O 0.500 mol of HCH2O with 0.500 mol of NaCH2O at
at 25˚C. 25˚C.
11. The pH of a solution obtained from the titration The pH of a solution obtained from the titration
of 25.0 mL of 0.15 M CH3NH2 with 25.0 mL of of 25.0 mL of 0.15 M KOH with 25.0 mL of 0.15 M
0.15 M HCl at 25˚C. HCl at 25˚C.
12. Rate of a reaction for which DG˚rxn = -50 kJ/mol. Rate of a reaction for which DG˚rxn = -5.0 kJ/mol.
13. The solubility of PbCl2 (Ksp = 1.82 x 10-8) in a The solubility of PbCl2 in a solution containing
solution containing 0.010 M KCl at 25˚C. 0.010 M Pb(NO3)2 at 25˚C.
14. DSrxn for the thermite oxidation-reduction DSrxn for the gun cotton (nitrocellulose)
reaction. decomposition reaction.
Students do not have permission to share or distribute this exam, this includes but is not limited to sharing via ANY
electronic medium.
This study source was downloaded by 100000869267694 from CourseHero.com on 07-12-2023 04:07:45 GMT -05:00
https://www.coursehero.com/file/104028941/CHEM-1602-S19-Exam-3pdf/
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