CHE 105 EXAMINATION III November 11, 2010

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1 CHE 105 EXAMINATION III Nvember 11, 2010 University f Kentucky Department f Chemistry READ THESE DIRECTIONS CAREFULLY BEFORE STARTING THE EXAMINATION! It is extremely imprtant that yu fill in the answer sheet EXACTLY as indicated, therwise yur test may nt be prcessed; ALL entries are t be made n SIDE 1 f the answer sheet. Use a #2 pencil (r sfter); fill in the circles cmpletely and firmly. Erasures must be cmplete. Use nly the fllwing categries: NAME: STUDENT NUMBER: TEST FORM: SPECIAL CODES: Print yur name starting at the first space, LAST NAME first, then a space, fllwed by yur FIRST NAME, then anther space, fllwed by yur MIDDLE INITIAL. Fill in the crrect circles belw yur printed name crrespnding t the letters f yur name; fr the spaces, fill in the tp blank circle. This is VERY IMPORTANT! Under IDENTIFICATION NUMBER, put in yur 8 DIGIT STUDENT ID NUMBER (d nt use the 9 at the beginning f yur number) beginning in clumn A and cntinuing thrugh clumn H, clumn I will be blank, (d NOT use clumn J at this time); be sure t fill in the crrect circles (a cmmn errr t be avided is mistaking "0" fr "1"). Fill in the "3" blank in the J clumn under IDENTIFICATION NUMBER (t indicate Hur Examinatin III). Use fr curse and sectin number; in psitins K-P write in ne f the fllwing: Dr. Wdrum , Mr. Harris , Dr. Ades Dr. Knecht Dr. Testa , Dr. Guzman SIGNATURE: Yu MUST sign the examinatin answer sheet (bubble sheet) n the line directly abve yur printed name. Use yur legal signature. Answering Questins: Starting with answer "1" n SIDE 1, fill in the circle indicating the ne best answer fr each f the 33 questins in this examinatin. Yur scre is the sum f the apprpriate credit fr each respnse. The day after the examinatin is finished, an examinatin key will be psted n Blackbard. Grading and Reprting: The examinatin scres will be psted in Blackbard as sn as pssible after the examinatin. If an errr has been made in scring yur answers, tell yur instructr within 48 hurs f the psting f yur scre. BE SURE THAT YOUR TEST HAS 33 QUESTIONS, A PERIODIC TABLE, AND ONE SHEET OF SCRATCH PAPER. Yu may NOT use yur wn scratch paper during this examinatin. Cell phnes and pagers are t be turned ff and ut f sight during the exams.

2 1. What is the final temperature f g f water, initially at 27 C, after absrbing 5.00 kj f heat? The specific heat capacity f water is 4.18 J/g C. A C C C B C D C 2. A 20.0 g blck f a metal, initially at 80.0 C, was added t g f water initially at 22.0 C. After thermal equilibrium was reached, the temperature f the metal and water was 23.0 C. What is the specific heat capacity f the unknwn metal? The specific heat capacity f water is 4.18 J/g C. A J/g C C J/g C B J/g C D J/g C 3. A balln is inflated frm L t L against an external pressure f atm. Hw much wrk is dne in jules? A J C J B. 496 J D J 4. Which ne f the fllwing statements is nt true with regard t a chemical reactin ccurring under cnditins f cnstant pressure? A. H is a measure f heat exchange between the surrundings and the system under cnditins f cnstant pressure. B. E is a measure f all the energy exchanged between the system and the surrundings. C. H and E are equal if a large vlume change accmpanies the reactin. D. E is a measure f the heat and wrk exchanged between the surrundings and the system.

3 5. Based upn yur understanding f cmbustin reactins, which ne f the fllwing statements is true? A. Cmbustin reactins are exthermic and enthalpy change is psitive. B. Cmbustin reactins are exthermic and enthalpy change is negative. C. Cmbustin reactins are endthermic and enthalpy change is psitive. D. Cmbustin reactins are endthermic and enthalpy change is negative. 6. Accrding t the fllwing thermchemical equatin, what mass f HF (in grams) must react in rder t prduce 345 kj f energy? Assume that SiO 2 is in excess. SiO 2 (s) + 4 HF(g) SiF 4 (g) + 2 H 2 O(l) H rxn = 184 kj A g C g B g D. 107 g 7. What is H rxn fr the reactin: CS 2 (l) + 3 Cl 2 (g) CCl 4 (l) + S 2 Cl 2 (l) Use apprpriate data frm the fllwing set f reactins and their given H values. CS 2 (l) + 3 O 2 (g) CO 2 (g) + 2 SO 2 (g) H = kj 2 S(s) + Cl 2 (g) S 2 Cl 2 (l) H = 58.2 kj C(s) + 2 Cl 2 (g) CCl 4 (l) H = kj S(s) + O 2 (g) SO 2 (g) H = kj SO 2 (g) + Cl 2 (g) SO 2 Cl 2 (g) H = kj C(s) + O 2 (g) CO 2 (g) H = kj CCl 4 (l) + O 2 (g) COCl 2 (g) + Cl 2 O(g) H = 5.2 kj A kj C kj B kj D kj

4 8. Which chemical equatin listed belw has an enthalpy change equal t the standard enthalpy f frmatin f CH 4 (g)? A. CO(g) + 3 H 2 (g) CH 4 (g) + H 2 O(g). B. C(s, graphite) + 2 H 2 (g) CH 4 (g). C. C(s, diamnd) + 2 H 2 (g) CH 4 (g). D. C(g, graphite) + 2 H 2 O(g) CH 4 (g) + O 2 (g). 9. Use the H f and H rxn infrmatin prvided belw t calculate H f fr SO 3 (g). 2 SO 2 (g) + O 2 (g) 2 SO 3 (g) H rxn = 198 kj H f f SO 2 (g) = 297 kj A. 396 kj/ml C. 248 kj/ml B. 792 kj/ml D. 495 kj/ml 10. Which ne f the fllwing is nt true regarding the wave nature f light? A. The amplitude f the wave determines the intensity f the light. B. Light is electrmagnetic radiatin. C. Visible light cmprises nly a small fractin f all the wavelengths f light. D. Fr visible light, the wavelength des nt determine the visual clr. 11. What is the wavelength, in meters, assciated with electrmagnetic radiatin at 4.50 khz? A m C m B m D m

5 12. Hw many phtns are cntained in a flash f green light (525 nm) that cntains 189 kj f energy? A phtns C phtns B phtns D phtns 13. What is the wavelength, in nm, f the phtn emitted when an electrn in the hydrgen atm makes a transitin frm the energy level n = 7 t the energy level n = 4? A nm C nm B. 852 nm D. 183 nm 14. Calculate the wavelength f an electrn (m = g) mving at m/s. A m C m B m D m 15. Hw many different values f l are pssible in the third principal energy level? A. 1 C. 3 B. 2 D Hw many different values f m l are pssible in the 3d sublevel? A. 3 C. 4 B. 2 D Which f the fllwing is an allwed set f quantum numbers [n, l, m l ] fr a d rbital? A. [2, 2, 1] C. [4, 3, 2] B. [3, 2, 1] D. [5, 2, 3]

6 18. Which ne f the fllwing rbitals culd have the fllwing quantum numbers: n = 5, l = 2 A. C. B. D. 19. Which f the fllwing is a pssible set f quantum numbers fr the last electrn added t cmplete an atm f antimny in its grund state? A. n = 5, l = 1, m l = 0, m s = 1/2 C. n = 4, l = 1, m l = 1, m s = 1/2 B. n = 5, l = 2, m l = 1, m s = 1/2 D. n = 4, l = 3, m l = 0, m s = 1/2 20. Which f the fllwing statements is false? A. The 3s rbital is lwer in energy than the 3p rbitals. B. The 5f rbitals are higher in energy than the 6p rbitals. C. The 3d rbitals are lwer in energy than the 4s rbital. D. The 4f rbitals are higher in energy than the 6s rbital. 21. Which f the listed elements has the fllwing grund state electrn cnfiguratin? [Ar]4s 2 3d 10 4p 5 A. chlrine C. selenium B. kryptn D. brmine

7 22. Give the cmplete grund state electrnic cnfiguratin fr chrmium. A. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 4d 5 C. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 4p 5 B. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 4 D. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 1 3d Which f the fllwing pairs has the atm with the larger atmic radius listed first? A. Cl, Si C. O, Si B. N, As D. Ga, P 24. Which in des nt have a nble gas cnfiguratin in its grund state? A. Ga 3+ C. As 3 B. Sc 3+ D. Al Place the fllwing elements in rder f increasing inic radius. Na + Mg 2+ F A. Mg 2+ < Na + < F C. Na + < Mg 2+ < F B. Mg 2+ < F < Na + D. F < Na + < Mg Place the fllwing in rder f increasing first inizatin energy. N As F A. N < As < F C. F < N < As B. As < N < F D. As < F < N 27. Which f the fllwing elements has the mst exthermic electrn affinity? A. B C. N B. C D. F

8 28. Which ne f the fllwing elements is mst likely t have the fllwing inizatin energies (in kj/ml)? 1 st = nd = rd = th = th = th = A. magnesium C. nen B. ptassium D. selenium 29. In general, which grup f elements has the mst metallic character? A. alkali metals C. halgens B. nble gases D. alkali earth metals 30. Which f the fllwing is false? A. Cvalent bnds result frm the sharing f electrns. B. Cvalent bnds are frmed between tw nnmetals. C. Inic bnds are frmed between tw metals. D. Ptassium fluride cntains inic bnds. 31. Use Lewis thery t determine the chemical frmula fr the cmpund frmed between Rb and S. A. RbS C. Rb 2 S B. RbS 2 D. Rb 2 S Identify the cmpund with the highest magnitude lattice energy value. A. LiCl C. NaCl B. KCl D. CsCl 33. Identify the cmpund with the highest magnitude lattice energy value A. CaO C. KCl B. KBr D. SrO

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10 CHE 105 Exam 3 Nvember 11, 2010 Questin Crrrect Answer B B B C B C D B A D C B A D C D B C A C D D D A A B D A A C C A A Partial Credit