Question 1

Draw and label (cis and trans) the stereoisomers of the square-planar complex ion, CuCl₂Br₂²^-.

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Question 2

What is the name of [Zn(H₂O)₂(OH)₂]?

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Question 3

What determines whether a transition metal ion is in a high-spin or a low-spin electron configuration?

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Question 4

Explain why Ni(CN)₄²^- is diamagnetic and NiCl₄²^- is paramagnetic in terms of the possible geometries (tetrahedral and square planar) and the magnitudes of the crystal field splitting?

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Question 5

Unlike most transition metal compounds, those of Scandium(III) are colorless. Why?

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Question 6

One of the following solutions is acidic. Identify which, explain why, and write an appropriate reaction equation showing the production of hydronium ion. CaCl₂, CrCl₂, MgCl₂, NaCl

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Question 7

Define the term polydentate ligand, and give an example of one.

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Question 8

The pK_a of hydrated iron(III) is 2.5, and the pK_a of hydrated nickel(II) is 10.0. If 0.1 M solutions of iron(III) nitrate and nickel(II) nitrate are constituted, which one will be the more acidic and why?

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Question 9

Ingestion of mercury, which is poisonous, often is treated using chelation therapy. One agent used in this therapy is dimercaprol, which is shown below. Identify the features in the structure of this molecule that make it an effective chelation agent.

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Question 10

What is the name of [Fe(NH₃)₅Br]²⁺?

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Question 11

Why are compounds of most of the first-row transition metals colored?

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Question 12

Write appropriate chemical reaction equations to show why (1) nearly colorless solid nickel(II) sulfate dissolves in water to produce a green solution, then (2) the addition of ammonia produces a blue solution, and (3) evaporation of the solvent produces a blue-violet precipitate.

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Question 13

Ingestion of mercury, which is poisonous, often is treated using chelation therapy. One agent used in this therapy is dimercaprol, which is shown below. Explain why this compound has a high affinity for mercury atoms or ions and is able to tie these up in a complex so there is little free mercury to react with and disrupt the function of biological molecules.

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Question 14

Draw and label the cis and trans isomers of octahedral NiX₄Y₂.

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Quiz 18: The Colorful Chemistry of Metals

Draw and label (cis and trans) the stereoisomers of the square-planar complex ion, CuCl2Br22-.

What is the name of [Zn(H2O)2(OH)2]?