VSEPR Theory Review

What is the VSEPR theory used to predict?

• Bond Strength

• Polarity

• Molecular Shape

• Electronegativity

According to VSEPR, molecules adjust their shapes to keep which of the following as far away as possible?

• Pairs of valence electrons

• Inner shell electrons

• Mobile Electrons

• Electrons closest to the nucleus

What is the AXE # of the molecule shown?

• AX₂E₃

• AXE₃

• AX₄E

• AX₃E₂

What is the main idea behind VSEPR theory?

• Electrons and nuclei attract each other.

• Electron pairs repel each other to maximize the distance between them.

• Electrons move in predictable orbits.

• Bonding pairs of electrons are the most stable.

Which of the following is NOT a factor that VSEPR theory considers to predict the shape of a molecule?

• The number of lone pairs on the central atom

• The number of bonding pairs on the central atom

• The weight of the atoms in the molecule

• The repulsion between electron pairs

How does the presence of lone pairs affect the bond angles in a molecule?

• Increases the bond angles

• Decreases the bond angles

• Does not affect the bond angles

• Randomly affects the bond angles

Which molecular geometry has four bonding pairs and no lone pairs of electrons?

• Linear

• Trigonal planar

• Tetrahedral

• Trigonal pyramidal

In a trigonal pyramidal molecule, how many bonding pairs and lone pairs are there?

• 3 bonding pairs, 1 lone pair

• 2 bonding pairs, 2 lone pairs

• 4 bonding pairs, 0 lone pairs

• 3 bonding pairs, 0 lone pairs

What is the shape of a molecule with three bonding pairs and no lone pairs of electrons?

• Linear

• Trigonal planar

• Tetrahedral

• Bent

In VSEPR theory, what do lone pairs of electrons do to the shape of a molecule?

• They do not affect the shape.

• They make the molecule larger.

• They push bonding pairs closer together.

• They pull bonding pairs further apart.