Chem 130 Third Exam. ö ø. Name

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1 Nme Chem 130 Third Exm On the following pges re eight questions tht consider topics rnging from precipittion solubility, cid bse, nd oxidtion reduction rections to metl lignd complexes nd coordintion compounds. Red ech question crefully nd consider how you will pproch it before you put pen or pencil to pper. If you re unsure how to nswer one question, then move on to nother question; working on new question my suggest n pproch to the one tht is more troublesome. If question requires written response, be sure tht you nswer in complete sentences nd tht you directly nd clerly ddress the question. Question 1 /15 Question /17 Question 3 /15 Question 5 /15 Question 6 /8 Question 7 /15 Question 4 /15 Totl /100 Potentilly useful equtions nd constnts: c = ln KE = hn W E = hn = hc/l 1 = λ 1 nm n1 n 1 FC B = V - N V Q $Q d - AVEE = xie, + yie / + zie 1 x + y + z (vlence shell electrons only) δ = V - N - B æ EN ç è EN + EN b ö ø c = m/s h = Js N A = mol 1 Other potentilly useful informtion is vilble s seprte hndouts.

2 Problem 1. For ech pir of cids, circle the one tht is the stronger cid nd, in no more thn 3 sentences ech, explin the reson(s) for your choice. For the compounds in (b) nd in (c), the cidic hydrogen is ttched to oxygen. () NH 4 + vs. PH 4 + (b) HOBr vs. HOI (c) H CO 3 vs. HCO 3 Problem. The following informtion is known for rections between the elements A, B, C, nd D, nd their +1 ctions, A +, B +, C +, nd D + ; note tht NR mens there is no rection: () C + B + C + + B (b) C + + A NR (c) A + + D NR (d) D + B + D + + B Predict the products of the following two rections, writing NR if there is no rection. (e) D + + C (f) A + + B In the spce below, present convincing rgument tht your responses re correct by rrnging the ction/element pirs into rectivity series ordered from the strongest oxidizing gent to the wekest oxidizing gent nd explining how you rrived t this order; in ddition, explin why your rectivity series supports your predictions. Limit the written portion of your response to 3 6 sentences. strongest oxidizing gent wekest oxidizing gent

3 Problem 3. Suppose you hve solution tht might contin one or more of the following ctions: Pb + Co + Fe 3+ B + NH 4 + To identify the ions in the solution you dd HCl to the solution nd observe precipitte. After centrifuging, you remove the superntnt solution from the precipitte, dd H SO 4 to this solution, nd observe precipitte. After centrifuging, you remove the superntnt from this second precipitte, dd NOH to this solution, nd observe tht no precipitte forms. In the tble below, plce ech of the five ctions in the cell tht mtches your prediction tht it must be present, tht it must be bsent, or tht you do not hve sufficient informtion to determine if it is present or if it is bsent. ction must be present ction must be bsent insufficient informtion In the spce below nd in short prgrph of 3 5 sentences, present convincing rgument tht your ssignments for ll five ctions re correct. Note: to receive full credit your explntion here must support your predictions. Problem 4. The drug Nipride, N [Fe(CN) 5 NO], is metl-lignd complex tht is used s source of moleculr NO during surgery where it helps moderte blood pressure. Although the compound releses moleculr NO into the blood strem, it is present in the metl-lignd complex s the ction NO +. When we first described metl-lignd complex we chrcterized the metl in terms of its coordintion vlency nd its ordinry vlency. Using Nipride s n exmple, in -4 sentences, clerly explin the difference between these two types of vlencies nd report their vlues for the metllignd complex in Nipride. The iron in this metl-lignd complex is expected to be low-spin due to the presence of the cyno nd the nitrosyl lignds. How mny unpired electrons re in iron s d-orbils? Explin how you rrived t your response in -3 sentences.

4 Problem 5. Octhedrl metl-lignd complexes of chromium (III) re quite colorful. For exmple, the following is list of severl such metl-lignd complexes nd their colors. Cr(cc) 3 : red [Cr(H O) 6 ] 3+ : violet [CrCl (H O) 4 ] + : green [Cr(ure) 6 ] 3+ : green [Cr(NH 3 ) 6 ] 3+ : yellow Cr(CH 3 CO ) 3 (H O) 3 : blue-violet where the lignds re cetylcetone (written here in shorthnd nottion s cc), wter, chloride, ure, mmoni, nd cette (which is CH 3 CO ). Arrnge the lignds in order of incresing vlues for the octhedrl field splitting, D o. Explin how you rrived t your ordering in prgrph of 4 6 sentences. Note: to receive full credit your explntion here must support your predictions. Problem 6. Provide the chemicl formul for the coordintion compound tht hs the following nme: hexmminecoblt(iii) pentchlorocuprte(ii). Provide the nme for the coordintion compound tht hs the following formul: (NH 4 ) 4 [Fe(ox) 3 ] where ox is short for the oxlte nion, C O 4.

5 Problem 7. Consider the hypotheticl octhedrl metl-lignd complex MABC D, which consists of the lignds A, B, C, nd D. Drw ll possible geometric isomers for this metl-lignd complex. Do not consider opticl isomers. Be creful to drw only once ech unique geometric isomer. There re more cells vilble to you in the tble below then there re unique isomers. You my use the spce t the bottom of the pge or on the bck of this pge to consider possibilities, but only those structures plced in the tble will be evluted. Be sure your structures re cler nd esy to understnd. If mking chnge to structure mkes it too messy, then plce lrge X through the structure nd redrw it in new cell.

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