midterm2a_sp08

midterm2a_sp08 - 1. [6 points] What is the correct name for...

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1. [6 points] What is the correct name for the compound [Mn(en) 2 (OH) 2 ]Cl 2 a. Bis(ethylenediamine)dihydroxymanganese(II) dichloride b. Bis(ethylenediamine)dihydroxymanganese(IV) chloride c. Diethylenediaminedihydroxymanganese(IV) chloride d. Diethylenediaminedihydroxidemanganese(II) dichloride e. Bis(ethylenediamine)dihydroxidemanganese(IV) chloride Figure 1 2. [6 points] The neutral molecule shown in Figure 1 has the formula CoBr 2 N 4 C 4 H 16 . What is the name of this molecule? a. cis-bis(ethylenediamine)dibromocobalt(II) b. cis-dibromobis(ethylenediamine)cobalt(II) c. trans-dibromobis(ethylenediamine)cobalt(IV) d. trans-dibromobis(ethylenediamine)cobalt(II) e. None of the above 3. [7 points] Consider the following coordination complexes: I. [Co(en) 3 ] 2+ II. trans-[Nb(C 2 O 4 ) 2 (NH 3 ) 2 ] + III. cis-[Nb(C 2 O 4 ) 2 (NH 3 ) 2 ] + IV. cis-[Pt(en)Cl 2 ] Which of these complexes have an optical isomer (an enantiomer)? a. I only b. I and II c. I and III d. I, II and III e. III and IV
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4. [6 points] During the formation of a coordination compound, ligands act as ___________. (a) Lewis bases (b) Arrhenius bases (c) Bronsted bases (d) Lewis acids (e) Arrhenius acids 5. [6 points] In the compound K 3 [Co(CN) 6 ] how many unpaired electrons are there on the cobalt atom? (a) 0 (b) 2 (c) 4 (d) 5 (e) 6 6. [7 points] How many of the following transition metal ions would you expect to be colorless in aqueous solution? Cu 2+ Zn 2+ Ru 4+ Cu + Cr 3+ (a) zero (b) one (c) two (d) three (e) four 7. [7 points] Determine the number of unpaired electrons for each of the following coordination complexes: [RhCl 6 ] 2– [MnCl 6 ] 2– [Ni(H 2 O) 6 ] 2+ [Pt(CN) 4 ] 2– Arrange these complexes in order of increasing number of unpaired electrons (in the answers below an = sign is used if two complexes have the same number of unpaired electrons). a. Fewest [Ni(H 2 O) 6 ] 2+ = Pt(CN) 4 ] 2– < [MnCl 6 ] 2– < [RhCl 6 ] 2– Greatest b. Fewest [Pt(CN) 4 ] 2– < [Ni(H 2 O) 6 ] 2+ < [MnCl 6 ] 2– < [RhCl 6 ] 2– Greatest c. Fewest [Pt(CN) 4 ] 2– < [RhCl 6 ] 2– < [Ni(H 2 O) 6 ] 2+ < [MnCl 6 ] 2– Greatest d. Fewest [MnCl 6 ] 2– < [RhCl 6 ] 2– < [Ni(H 2 O) 6 ] 2+ = [Pt(CN) 4 ] 2– Greatest e. Fewest [Pt(CN) 4 ] 2– < [Ni(H 2 O) 6 ] 2+ < [RhCl 6 ] 2– < [MnCl 6 ] 2– Greatest
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8. [6 points] If two molecules have the same number and type of atoms as well as the same bonds they could be either ___________________? (a)
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midterm2a_sp08 - 1. [6 points] What is the correct name for...

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