chem practice exam 3

chem practice exam 3 - CHEMISTRY 1131 HOER EXAM 3 15...

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Unformatted text preview: CHEMISTRY 1131 HOER EXAM 3 15 November 2607 Professor Parson Answer all questions on the computer-graded answer sheets by filling in the proper bubble with a Number 2 pencil. If you change an answer, erase it thoroughly. Mark only one answer for each question. BE SURE TO FILL IN THE BOXES FOR YOUR STUDENT NUMBER, NAME AND LAB SECTION. THEN GRID IN T HE CORRESPONDING B UBBLES BENEA TH THEM A periodic table with atomic numbers and masses is attached to the back of this covsr sheet. Two pages of scrap paper are appended at the end. If you need more scratch paper we will provide it. Gas constant, R = 8.314 J K4 mol" smutyfiules for Ionic Compounds ‘6! 1/10”? {it Var/l m w" Generally solubml all (Group I) and Anyonifiin (NEH) salts; Nitrates (N05), and acetates (CI-LCOO‘), exce egg; Cléflfin¥T salts, except for Ag: Pb“, Hg“, Egg”; Sulfates (8042'), except for Agfi Phi-F, fig ffmgilfa“, Sr“, Ba“. 4 Generally insoluble: Carbonates (C032), excepoWonium carbonates; Hydroxides (011'), except for allgali’find Ba2+ hydroxides; Fluori ' , except alkali, Ag": and Be“ fluorides; Sulfrcfles‘fsz‘), except alkali, ammonium, and aikahn earth (Group Ii) sulfides. Spectrochemical Series: I" < Br‘< CI'< F' < OH< H20 < NCS'< NHg < e‘n < N02"< CN'< C0 1. How many moles of silverG) iodide, lisp283xI0‘17, will dissolve in 5.0 L of pure water ? a. 1.7x10'" in. 8.3x’20'” c. ems-16 cl. 1.8x10“9 8. 4.8K10'8 2. How many moles of silverfi) iodide, K5P283x10‘”, will dissolVe in 5.0 L of a L0 M solution of silver nitrate ? a. 1.7x1047 b. 3.3x10'” c. ems-15 d. 9.1x10'9 e. 4.6x10‘8 3. The equilibrium constant for the reaction: Agl(s) + 2 32032" ‘15 [Ag(3203)2]3' + 2 i" is 3.9x10‘3. What is the formation constant Kf of [Ag(3203)2]3' '2’ a. 3.2x10'19 b. 2.1K10'M c.27o cinema“ e.4.7x1013 4. Which of the following ionic compounds are more soluble in 1.0 M HCl than in pure water ? {Wng CaCOa. AgCN AI(OH)3 a. Mng and AI(OH)3 b. 62:00; and AQCN c. All of them. (5. None ofthem. 5. Which of the following cannot be a ligand in a complex ion? 3. CH4 1". OH— C. d. 02 e. 02' 6. What is the electron configuration of V when it is in its maximum oxidation state? a. [Ar] 4szsd‘ b. [Ar] 45” 3:12 c. [Ar] :1. [Ar] 432 e. {Ar} 43" 3013 7. How many d electrons are on the central metal ion in [00(NH3)ZCL;]2‘ ? 5.7 h.6 0.5 (t4 9.3 8. Which of the following complex ions is most likely to have exactly one unpaired electron ? a. [Fe(NH3)s]2” h. {00(NH3)5]3+ c. [Femzomfl a. [Con-EMA” 9. Which of the following complex ions have Opticai isomers? a. Cis-dichloro cis-dibromo ethylenediamine cobaltUlE) b. cis—dichloro trans-dibromo ethylenediamine cobalt(ll|) 0. Both a. and b. d. Neither a. nor b. 10. Which of the following complex ions are most Eilcely to absorb visible light? i. [('.2u(i-iz{))4.]2+ ii. [Cr(Ni-l3)5]s+ iii. [ZnCi4]2‘ a. i. only $3. ii only C. iii only d. i. and ii. e. ii. and iii. 11. Hemoglobin, the oxygen—carrying protein in human biood, is responsible for its red color. In a horseshoe crab, oxygen is carried by hemocyanin, which gives it a blue color. Which statement is true? a. Human blood absorbs light with longer wavelengths than horseshoe crab blood because hemoglobin has a largerA than hemocyanin. b. Human blood absorbs light with longerwavelengths than horseshoe crab blood because hemoglobin has a smallerA than hemocyanin. 0. Human blood absorbs light with shorter wavelengths than horseshoe crab blood because hemoglobin has a largerA than hemocyanln. d. Human blood absorbs light with shorter wavelengths than horseshoe crab blood because hemoglobin has a smallerA than hemocyanin. 12. Which of the following ions can form distinct high~spin and low-spin octahedral complexes? 3. Fe(ll) b. Fe(IV) c. Fe(Vl) d. Fe(ll) and Fem!) e. Fe(lV) and Fe(Vl) 13. You have solutions of three complex ions, [MG5]3' which is green, {MY5]3' which is yellow, and [MRGP' which is red. M is in the same oxidation state in all three ions. Which could be the ligands ? a. R = Cl; Y = OH, and G = CN' b. R = OH', Y = Cl‘, and G = CN‘ 8. R = CN‘ , Y = 0H, and G = Cl' d. R = Cl“, Y = CN', and G = OH" e. R = OH', Y = Chl', and G = Cl‘ 14. Which, if any, of the following complex ions has an optical isomer ? e, eases? tsetse 15. Which of the following complex ions could exist as geometric isomers? (The Pt and Cu complexes are square planar and the Ni complex is tetrahedral.) [oomzokmanzczzr gCu(NH3)2Ci2] EPt(en)Br2] [Ni(NH3)zBrz] l n III IV a. i and IE b. I, 0!, and IV 0. ll, ill, and N d. l and IV 9. I, ll, Ill and IV 16. How many unpaired electrons does iron have in the complex ion [FeCl4327 3.1 b.2 6.3 (14 e.5 1?. Ozone, 03, decomposes to oxygen according to the overall balanced reaction 2 03 —> 3 02. If 0.010 moles of 03 react in 1 second, how many moles of 02 will be produced in that second? a. 0.050 b. 0.067 c. 0.010 ti. 0.015 I 9. 0.020 18. A reaction obeys the rate law 1' : lc{A}[B]3. If the concentration of A is doubled whiie the concentration of B is halved, by what factor does the rate change? a. The new rate is half the original rate. h. The new rate is twice the original rate. 0. The new rate is four times the original rate. d. The new rate is one fourth of the original rate. 6. The rate does not change. Use this Reterenee sisters and date te answer Qaestions ts a 2% below. This represents a slightly soluble CogIH) salt dissolved in water. To the right are some data related to this CoGH) salt. Co“ 5,40x10'17L Salt C Dissolved Which salts are THE SAME C0611) salt as depicted in the Reference picture? a. Salts A and B b. Salts B and C c. Salts A and C d. All three salts e. None of these salts 26. Suppose you add a few drops of ammonia to the beaker containing the Co(III) salt. Which of the following results would you predict? (Note: [C0(HgO)6]3+ complexes are blue.) a. Some salt would dissolve and the solution would turn yellow-orange. b. Some salt would dissolve and the solution would turn green. 8. No salt would dissolve, but the solution would turn yellow-orange. d. No salt would dissolve, but the solution would turn green. -cation -anion ...
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This note was uploaded on 04/16/2008 for the course CHEM 1131 taught by Professor Redin,kend during the Spring '08 term at Colorado.

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chem practice exam 3 - CHEMISTRY 1131 HOER EXAM 3 15...

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