Chapter 23 Practice Test

Question 1

What is the principal characteristic of transition metals that distinguishes them from other elements?

Answer 1

Transition metals have partially filled d orbitals in their valence shell.

Question 2

Which of the following elements is a transition metal?

Answer 2

gold (Au)

Question 3

When we write the electron configuration for fourth period transition metals, we use the notation “[Ar]” to denote that the transition metal has the same configuration as argon plus some additional electrons. For example, Ti is written as [Ar] 3d24s2. What is the correct electron configuration for argon (Ar)?

Answer 3

1s22s22p63s23p6

Question 4

Which of the following is not characteristic of transition metals?

Answer 4

Transition metals have localized valence electrons.

Question 5

Which of the following statements best define what a ligand is?

Answer 5

A ligand is molecule or ion that bonds to a metal through a process by which the ligand donates a lone pair of electrons.

Question 6

Which of the following is not a common ligand?

Answer 6

Fe3+

Question 7

Look at the diagrams for [Co(en)3 ]3+ and Fe(EDTA).

Which statement about these polydentate ligand complexes is not correct?

Answer 7

In the Fe(EDTA) complex, the iron ion is surrounded by two polydentate ligands (EDTA).

Question 8

Which of the following correctly names the complex ion [Cr(CN)6 ]3−?

Answer 8

hexacyanochromate(III) ion

Question 9

What is the correct name for the neutral compound [Co(NH3 )3(H2O)3 ]2(SO4 )3?

Answer 9

triaminetriaquacobalt(III) sulfate

Question 10

What is the correct name for the neutral coordination compound, Pt(NH3 )2Cl2?

Answer 10

diamminedichloroplatinum(II)

Question 11

What are isomers?

Answer 11

Isomers are molecules that have the same molecular formula, but are different compounds.

Question 12

Which statement about the constitutional isomers ethanol and dimethyl ether is not correct?

Answer 12

In dimethyl ether, a carbon atom is connected to the oxygen atom, and the oxygen atom is connected to a hydrogen atom.

Question 13

Which statement about enantiomers is not correct?

Answer 13

If a molecule has an internal plane of symmetry, it can have optical isomers.

Question 14

Which statement about color or the color chart is not correct?

Answer 14

In transition metals, the d orbitals are very far apart; therefore, any changes in ΔE are very large, resulting in colors in the ultraviolet range.

Question 15

Which statement about transition metals is not correct?

Answer 15

Transition metals in solution exhibit a small range of color differences.

Question 16

Look at the two different electron orbital arrangements for cobalt. Which statement about these arrangements is not correct?

Answer 16

In the ion with three electrons removed, the 3d orbitals have a higher energy level and thus contain all of the electrons.

Question 17

Carbon monoxide (CO) is a strong field ligand. What is the likely color of a solution of hexacarbonylcobalt(III) ion ( [Co(CO)6 ]3+ )?

Answer 17

yellow

Question 18

Which d orbitals are least affected by the ligands of a complex ion with square planar geometry?

Answer 18

dz2, dxz, and dyz

Question 19

Which of the five d orbitals is lowest in energy when no ligands are present?

Answer 19

they are all equal in energy

Question 20

Look at the orbital energy diagram for [Co(NH3 )6 ]3+ and [Co(F)6 ]3−. Which statement about this diagram is not correct?

Answer 20

There is greater split between the d orbitals of [Co(F)6 ]3− than the d orbitals of [Co(NH3 )6 ]3+.

Question 21

Look at the molecular orbital diagram for an M–L (metal-ligand) molecule. Which statement about this diagram is not correct?

Answer 21

The splitting of the orbitals is caused entirely by the repulsion that results when the ligand and metal interact.

Question 22

Look at the energy diagram of the different d orbitals for [Co(NH3 )6 ]3+ and [Co(F)6 ]3−. Which statement about this diagram is not correct?

Answer 22

The energy differences between d orbitals are not affected by the arrangement of the ligands.

Question 23

Look at the illustration for the free-electron model for metals. Which statement about this model is not correct?

Answer 23

The valence electrons are assigned to specific orbitals in the metal.

Question 24

Look at the illustration that shows the electron alignments (or orientations) for paramagnetic and ferromagnetic substances. Which statement about this diagram is not correct?

Answer 24

Paramagnetic substances always have random electron orientations.

Question 25

Which statement related to magnetism is not correct?

Answer 25

Lone electrons and electron pairs are attracted to magnetic fields.