Land final. 94

Land final. 94 - Name _ (Put name on all pages) TA _ Lab...

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Name ____________________________________ (Put name on all pages) TA ______________________________________ Lab Section Number Dr. Land March 21, 1994 Winter 1994 CHEMISTRY 2B Final Examination Instructions: CLOSED BOOK EXAM No books or notes allowed. All information required is contained on the exam. Place all work in space provided. If you require additional space, use the back of the exam. Be sure your exam has 13 pages of questions. (1) Read each question carefully. (2) There is no partial credit for problems in Part I (pages 1-6, 45%). (3) Show work in Part II (pages 7-13, 55%). Credit will be given only for work shown. Answers without work will not receive credit. (4) The last pages contain potentially useful info and a periodic table. You may remove these for easy access. (5) Grades will be posted across from the basement stockroom by Friday, March 25, 1994. (6) Graded exams will be available for viewing next quarter. (7) Please fill out an evaluation form after you have finished the exam and hand it in on your way out. Page: Possible Points Page: Possible Points Points 1. 16 points 7. 13 points, part. credit 2. 14 points 8. 10 points, part. credit 3. 15 points 9. 17 points, part. credit 4. 14 points 10. 20 points, part. credit 5. 16 points 11. 23 points, part. credit 6. 14 points 12. 12 points, part. credit 13. 16 points, part. credit Total Score (200) If you finish early, RECHECK YOUR ANSWERS.
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1 1.(4 pts) The thermochemical equation which defines the standard molar enthalpy of formation of AgBr(s) is A. 2Ag(s) + Br 2 (l) ---> 2AgBr(s) B. Ag(s) + Br(g) ---> AgBr(s) C. 2Ag(s) + Br 2 (g) ---> 2AgBr(s) D. Ag(s) + 1/2Br 2 (l) ---> AgBr(s) E. AgBr(s) <==> Ag + (aq) + Br - (aq) 2.(4 pts) The molar heats of vaporization of the halogens, X 2 , increase from top to bottom on the periodic table due to: A. hydrogen bonding B. London forces C. dipole-dipole forces D. ion-ion forces E. ion-dipole forces 3.(4 pts) The following process Na 2 SO 4 •10H 2 O(l) ---> Na 2 SO 4 •10H 2 O(s) and the sign of the enthalpy change are A. fusion, positive B. sublimation, positive C. condensation, negative D. melting, positive E. fusion, negative 4.(4 pts)All of the following are soluble in water except: A) AgClO 4 B) Na 2 CO 3 C) PbCl 2 D) AgNO 3 E) NaCl
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2 5.(4 pts) Consider the following reaction CaCO 3 (s) <==> CaO(s) + CO 2 (g) The equilibrium constant expression for this reaction is A) K c = [CaO]/[CaCO 3 ] B) K c = 1/[CO 2 ] C) K c = [CaO][CO 2 ]/[CaCO 3 ] D) K c = [CO 2 ] E) K c = 1/[CaCO 3 ] 6.(6 pts) Fill in the following table: (No credit for incorrect formulae or charges.) conjugate acid conjugate base HNO 3 __________ __________ (CH 3 ) 3 N __________ H 2 O H 2 O __________ __________ ClO
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Land final. 94 - Name _ (Put name on all pages) TA _ Lab...

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