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exam_2_keySUMMER - Name '1‘: E Student ID Number Lab TA...

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Unformatted text preview: Name '1‘: E Student ID Number Lab TA Name and Section 551 2007 - Dr. Nasiri CHEMISTRY 26 Exam II Instructions: CLOSED BOOK EXAM! No books, notes, or additional scrap paper are permitted. All information required is contained on the exam. Place all work in the space provided. If you require additional space, use the back of the exam. (1) Read each question carefully. (2) There is no partial credit for problems in Part I. (3) Please use the correct units and number of significant digits wherever necessary. (4) The last two pages contain a periodic table and some useful information. You may remove this for easy access. (5) Graded exams will be returned in lab sections next week. (6) If you finish early, RECHECK YOUR ANSWERS! U.C. Davis is an Honor Institution Multiple Choice (circle one) Part I (3 pts each) Exam II Page 2 of 8 Part I: Multiple Choice, Concepts (3 pts each) Choose the best answer and enter your choice on the cover-no partial credit 1. Which of the following could NOT exist as a pair of geometric isomers? A) [Pi(NHs)4F21 [Pt(NHs)Fs] 3' c) [Co(NH3)4F21* D) [Co(NH3)3F3] E) [C0(NH3)2F4] ' 2. Which of the following exists in more different allotropic forms than any other element? . A) xenon B) calcium @carbon D) sodium E) oxygen 3. Arrange the following elements in order of increasing atomic radii. Sr, Rb, Sb, I, In A)In<$b<I<$r<Rb B)Rb<$r<In<Sb<I C)I<5b<In<Rb<$r 4. Which is NOT a property of the alkali metals? high electronegativity B) formation of peroxides C) high conductivity D) low density E) low ionization energy 5. All the compounds given below would be expected to react with oxygen except: @NzOs B) 502 C) NO D) Cles E) NH3 6. Choose the INCORRECT statement. A) A reaction intermediate is produced and used up during the reaction. transition state and a reaction intermediate are the same. C) An activated complex has partially formed bonds. D) Reaction intermediates have fully formed bonds. E) The rate—determining step is the slow-step. 7. Which of the following best describes isomers that are non—superimposable mirror images of each other? A) structural isomers B) cis—trans isomers C) linkage isomers @enantiomers E) ionization isomers 8. Which of the following forms a colorless aqueous solution? ®Cua04 B) 60504 C) NiClz D) FeCl3 E) Cu(N03)z Exam II Page 3 of 8 9. Chlorophyll is a green pigment involved in the growth of plants. One type of chlorophyll is a complex. What color of light should plants grow best in? A) blue B) cyan C) green @ red E) yellow 10. Which metal ion is most likely to form a square planar complex ion with CN‘ ion? A) Coz“ B) Cuz‘ @Ni2* D) Fe” E) Fes‘ 11. Which complex can exist as enantiomers? A) [CoClz(H20)4]' [NiC|(SCN)(HzO)(NH3)] C) cis-[CrCl2(en)]‘ D) [P‘l'Cl2(NH3)2] E) ClS-[Cr‘Clz(CzO4)]+ 12. Identify the classification of isomers illustrated by [Cr($CN)(NH3)5]2*and [Cr(NC5) (NH3)5]2*. A) optical isomers B) ionization isomers C) cis-trans isomers D) geometric isomers @linkage isomers 13. What are the basic oxides of the following set NazO, MgO, P4010, $03 and BeO? A) MgO and BeO MgO and Na20 C) 503 and BeO D) P4010, and 503 E) M90, and $03 14. Which of the following elements forms the most basic hydride? A) F B) u C) c @Na E) Pt 15. Which of the following elements is naturally radioactive? A) s B) Se C) Te D) 0 (9% Part II: Fill in the blank 16. (3 pts each) Complete and balance the following reactions. If no reaction occurs, write NR. A) _¥Q_Na (S) + .22.;H20 (I) 9 3) Mg <5) + 4N2 (a) a C) .- Clz (9) + ___. NaF(aq) -> _&;&;.________ D) 4248 (s) + __~_3.H2 (g) 9 Exam II Page 4 of 8 Part III: Short Calculations (5 pts each) Please show all work for calculations-Partial credit may be given 17. (5 pts) In the first order reaction A -) products, [A] = 0.400 M initially and 0.250 M after 15.0 min. What is the half-life of the reaction? 4/3. - 0.6% p/A', . k ‘ ., ., (16(23 {Emmi _‘ l0 Lillt ‘1 Mme-kt tyk: inw‘m'OJH (0in anlf mm; (gt) . mecca) i371: lnlkjo‘JV‘Lflt 18. (5 pts) The reaction A + B -) C + D is second order in A and zero order in B. The value of k is 0.0290 M’1 min'l. What is the rate of this reaction when [A] = 0.387 M and [B] = 1.17 M? mic: l< Egg—[15.10 19. (5 pts) What is the rate constant at 305 K for the reaction: 2N205 —> 2NzO4 + 02, if k = 3.46x10‘5 5'1 at 298 K and E, = 106 kJ/mol? LL- 2." _l KL- lflLflfi— : [DEW/Md ' <_L__ _ 34Gslo’gs'i 9.3i45xio‘3 KAZmolK 3% 30$ Exam II Page 5 of 8 20. (10 st) Classify The following as paramagnetic or diamagneTic. Use The ideas of crysTal field Theory To explain your answer. (You musT include The labels for The orbiTals). a) [Fe(CN)6]4‘ b) [Fe(H60)6]3* CM, 1 S‘I’YDHES, HAD ‘3 Fe LT : dLb F633)“ :45 1;: T: 1 \ h‘a Ci: i’gz 4i: . 4l— 3&2ng (\xv}; (bk; Cl ” d} L‘ma Yi-C’l'lc— Fammagln 21. (8 st) Use The el menTary reacTions below To answer The following quesTions. srep 1. Clz (—9 20' (fasT) srep ZCHClg + cr —> CCI3 + HCI (slow) srep 3. CCls + Cl -> can (fasT) A) (2 st) WhaT is The overall reacTion? cm was a; Hat + col4 B) (6 st) DeTermine The raTe law implied by This mechanism. my kLECHClfil [Ci-l Exam II Page 6 of 8 Part IV: Long Answer- Please show all work for calculations-Partial credi? may be given , IE“ -Im m m IE! - ' 0.370 f3: 2 _ k n — 153,1i3 r‘ KLQFDQ? A (o S379)M(O-l33)n : A 35>,qo4 PL 1 :14— ) VPL I , »4‘ . v '—'__‘—. ’ Wk; 2 “END HIS; : (owoaM’J‘S‘fl M11263 0. am (0.. law) ...
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