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Exam 10: Theories of Bonding and Structure

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Question 1

True/False

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The square pyramid is one of the five basic geometries from which molecular shapes are determined.

A) True
B) False

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Question 2

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Which of these elements is capable of forming the strongest $\pi$ -bonds?

A) Hydrogen
B) Helium
C) Lithium
D) Carbon
E) Germanium

F) C) and D)
G) A) and E)

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Question 3

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An energy level scheme for the orbitals of second row diatomic molecules O₂ through Ne₂ , lists the molecular orbitals in the following order of increasing energy $\sigma$ _2s < $\sigma$ *_2s < $\sigma$ _2p(z) < $\pi$ _2p(y) , $\pi$ _2p(x) < $\pi$ *_2p(y) , $\pi$ *_2p(x) < $\sigma$ *_2p(z) Based on this energy level scheme, how many electrons are there in all of the antibonding molecular orbitals of the F₂⁺ ion in its ground state?

Based on valence bond theory, the predicted bond angle in the H₂S molecule is ________.

Application of the concepts of VSEPR theory leads to the prediction that the shape of the XeOF₄ molecule is

One way to make graphene is to heat silicon carbide, SiC, causing the more volatile elemental carbon to undergo sublimation, after which it is collected and purified.

The hexagonal pyramid is one of the five basic geometries from which molecular shapes are determined.

According to valence bond theory, the BrF₃ molecule has sp² hybrid orbitals on the bromine atom.Hint: Consider the valence electrons on the central atom.

Which of these examples is not one of the five basic geometries for molecules and ions?

Which molecule or ion uses an sp² set of hybrid orbitals on the central atom for ?bonding?Hint: Consider formal charge when deciding on the correct structure and remember that sulfur atoms can access d-orbitals.

The PCl₃ molecule has hybrid orbitals centered on the phosphorus atom. What are the hybrid orbitals used by the phosphorus atom?

Which statement about the ammonia molecule, NH₃, is true?

The H₂ ion, according to MO theory, has a bond order of

Electrons in a single, double, or triple bond, count as one, two, and three separate electron domains, respectively.

If we use the same molecular orbital energy level scheme for the valence orbitals in the NO molecule as was used for diatomic O₂ through N₂ molecules, σ_2s < σ*_2s < σ_2p(z)< π_2p(y), π_2p(x) < π*_2p(y), π*_2p(x)< σ*_2p(z) what is the bond order of the NO molecule?

Based on the Lewis structure, the number of electron domains in the valence shell of the arsenic atom in the AsCl₃ molecule is

Based on application of the VSEPR theory, the expected bond angles in the AsF₄ ion should be approximately

All of the atoms in the nitrate ion lie in the same plane.

A molecule has a central atom surrounded by 2 lone pairs and 3 atoms. The best description for the shape of the molecule is

In the CSe₂ molecule,