Exam 9: Molecular Geometry: Shape Determines Function

A) I only
B) II only
C) III only
D) I and II only
E) I, II, and III

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A) C₂^2
B) O₂^
C) N₂^2
D) Br₂^
E) Br₂^2

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A) oxygen (bond order = 2) ; peroxide (bond order = 3)
B) oxygen (bond order = 2) ; peroxide (bond order = 2)
C) oxygen (bond order = 4) ; peroxide (bond order = 4)
D) oxygen (bond order = 4) ; peroxide (bond order = 5)
E) oxygen (bond order = 2) ; peroxide (bond order = 1)

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A) pentagonal
B) tetrahedral
C) trigonal bipyramidal
D) trigonal planar
E) square pyramidal

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A) C₂H₂
B) H₂CO
C) CH₃Cl
D) C₂H₄
E) C₂H₂Cl₂

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A) Valence bond theory describes a bond as the overlap of atomic orbitals between two atoms.
B) Enhanced electron density between two positively charged nuclei attracts the nuclei together and forms the bond.
C) Hybridization of atomic orbitals is necessary to account for the molecular geometry.
D) In valence bond theory, hybridization determines the molecular shape or geometry.
E) Statements A-D are all correct.

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A) linear
B) bent
C) tetrahedral
D) trigonal pyramidal
E) trigonal planar

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A) sp
B) sp²
C) sp³d
D) sp³d ²
E) sp³

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A) Physical properties of a substance are not affected by the shape of the molecules.
B) The shape of a molecule refers to the three-dimensional arrangement of the atoms in space.
C) Solubility of a substance in a solvent is affected by the shape of the molecules.
D) Taste and aroma of a substance are affected by the shape of the molecules.
E) Biological activity and chemical reactivity of a substance are affected by the shape of the molecules.

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A) gallium has fewer valence electrons than silicon, so holes are created in the valence band of silicon.
B) gallium has more valence electrons than silicon, so electrons are added to the conduction band of silicon.
C) gallium causes electrons to be transferred from the valence band of silicon to the conduction band of silicon.
D) gallium causes electrons to be transferred from the conduction band of silicon to the valence band of silicon.
E) gallium is a better conductor of electricity than silicon.

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A) sp; sp
B) sp; sp²
C) sp²; sp³
D) sp³; sp²
E) sp²; sp

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A) CF₂Cl₂
B) CF₃Cl
C) CF₄
D) CFCl₃
E) CHFCl₂

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A) The ss geometry has fewer lone-pair bonding-pair interactions at 90^o.
B) The ss geometry has fewer lone-pair bonding-pair interactions at 120^o.
C) The ss geometry has fewer bonding-pair bonding-pair interactions at 120^o.
D) The ss geometry has fewer bonding-pair bonding-pair interactions at 90^o.
E) The ss geometry has fewer lone-pair lone-pair interactions at 90^o.

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The valence electron configuration of I₂F...

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Molecule 1: sp³ orbital on carbon overlap...

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A) square planar and sp.
B) trigonal planar and sp.
C) tetrahedral and sp³.
D) trigonal planar and sp².
E) T-shaped and sp².

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A) The region of electron density lies along the bond axis connecting the nuclei of the two atoms.
B) The bond can be described by the overlap of sp hybrid orbitals from each atom.
C) The bond can be described by the overlap of sp² hybrid orbitals from each atom.
D) The bond can be described by the overlap of sp³d hybrid orbitals from each atom.
E) The bond can be described by the overlap of an sp² hybrid orbital from one atom with an sp³ hybrid orbital from the other atom.

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A) linear
B) trigonal planar
C) tetrahedral
D) trigonal bipyramidal
E) octahedral

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