Textbook Question
What is the general trend in standard potentials for the oxidation of first-series transition metals from Sc to Zn? What is the reason for the trend?
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Ch.21 - Transition Elements and Coordination Chemistry
McMurry8th EditionChemistryISBN: 9781292336145
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Table of contents
- Ch.1 - Chemical Tools: Experimentation & Measurement170
- Ch.2 - Atoms, Molecules & Ions160
- Ch.3 - Mass Relationships in Chemical Reactions169
- Ch.4 - Reactions in Aqueous Solution199
- Ch.5 - Periodicity & Electronic Structure of Atoms102
- Ch.6 - Ionic Compounds: Periodic Trends and Bonding Theory92
- Ch.7 - Covalent Bonding and Electron-Dot Structures61
- Ch.8 - Covalent Compounds: Bonding Theories and Molecular Structure59
- Ch.9 - Thermochemistry: Chemical Energy122
- Ch.10 - Gases: Their Properties & Behavior155
- Ch.11 - Liquids & Phase Changes54
- Ch.12 - Solids and Solid-State Materials73
- Ch.13 - Solutions & Their Properties120
- Ch.14 - Chemical Kinetics98
- Ch.15 - Chemical Equilibrium125
- Ch.16 - Aqueous Equilibria: Acids & Bases110
- Ch.17 - Applications of Aqueous Equilibria147
- Ch.18 - Thermodynamics: Entropy, Free Energy & Equilibrium86
- Ch.19 - Electrochemistry154
- Ch.20 - Nuclear Chemistry96
- Ch.21 - Transition Elements and Coordination Chemistry156
- Ch.22 - The Main Group Elements187
- Ch.23 - Organic and Biological Chemistry51
Chapter 21, Problem 21.93
What is a racemic mixture? Does it affect plane-polarized light? Explain.
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A racemic mixture is a 50:50 mixture of two enantiomers, which are molecules that are mirror images of each other and cannot be superimposed.
Enantiomers have the ability to rotate plane-polarized light, but they do so in opposite directions. One enantiomer will rotate light in a clockwise direction (dextrorotatory), while the other will rotate it counterclockwise (levorotatory).
In a racemic mixture, the effects of the two enantiomers on plane-polarized light cancel each other out because they are present in equal amounts.
As a result, a racemic mixture does not rotate plane-polarized light and is considered optically inactive.
This property is important in chemistry and pharmacology, as the biological activity of enantiomers can differ significantly, even though they have the same chemical composition.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Racemic Mixture
A racemic mixture is a combination of equal amounts of two enantiomers, which are molecules that are mirror images of each other. These enantiomers have identical physical properties except for their interaction with plane-polarized light. In a racemic mixture, the optical activities of the two enantiomers cancel each other out, resulting in no net rotation of plane-polarized light.
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Solubility and Mixtures
Enantiomers
Enantiomers are a type of stereoisomer that are non-superimposable mirror images of each other. They possess the same molecular formula and connectivity but differ in the spatial arrangement of atoms. This difference can lead to distinct chemical behaviors, particularly in biological systems, where one enantiomer may be more active or effective than the other.
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02:33Drawing Enantiomers
Optical Activity
Optical activity refers to the ability of a substance to rotate the plane of polarized light. This property is a characteristic of chiral compounds, which include enantiomers. When plane-polarized light passes through a solution of a chiral substance, it can be rotated to the right (dextrorotatory) or to the left (levorotatory), depending on the specific enantiomer present. In racemic mixtures, the opposing rotations of the enantiomers result in no overall optical activity.
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02:02Activity Series Chart
Related Practice
Textbook Question
Draw a crystal field energy-level diagram for a square planar complex, and explain why square planar geometry is especially common for d8 complexes.
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Textbook Question
Predict the crystal field energy-level diagram for a square pyramidal ML5 complex that has two ligands along the axes but only one ligand along the z axis. Your diagram should be intermediate between those for an octahedral ML6 complex and a square planar ML4 complex.
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Textbook Question
Which of the following complexes are diamagnetic?
(a) [Ni(H2O)6]2+
(b) [Co(CN)6]3-
(c) [HgI4]2- (tetrahedral)
(d) [Cu(NH3)4]2+ (square planar)
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Textbook Question
The amount of paramagnetism for a first-series transition metal complex is related approximately to its spin-only magnetic moment. The spin-only value of the magnetic moment in units of Bohr magnetons (BM) is given by sqrt(n(n + 2)), where n is the number of unpaired electrons. Calculate the spin-only value of the magnetic moment for the 2+ ions of the first-series transition metals (except Sc) in octahedral complexes with (a) weak-field ligands and (b) strong-field ligands. For which electron configurations can the magnetic moment distinguish between high-spin and low-spin electron configurations?
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Textbook Question
What is the systematic name for each of the following coordination compounds?
(c) [Co(NH3)4Br2]Br
(d) Cu(gly)2
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