VSEPR Review (7C)

According to the Valence Shell Electron Pair Repulsion (VSEPR) Theory, which of the following chemicals would most likely have the shape of the model seen above?

• XeO4
• OF2
• CO
• SO3

Which of these statements describes the basic idea of the Valence Shell Electron Pair Repulsion (VSEPR) theory?

• There is always an octet of electrons around an atom in a molecule.
• Shared and unshared electron pairs repel each other as much as possible.
• Electrons are attracted to the nucleus of the central atom.
• Molecules repel one another due to intermolecular forces.

During exam review, one student quizzes another’s knowledge of molecular shape. Which molecule-molecular shape pair matches the description of the molecules with single bonds on the card shown below?

• H2O, Bent
• HCN, Linear
• CO2, Linear
• BeH2, Linear

Around the central atom in a covalently bonded molecule, there are four pairs of electrons: three shared pairs with three other bonded atoms and one unshared pair. The geometry of this molecule is best described as —

• linear
• trigonal planar
• trigonal pyramidal
• tetrahedral

Which of the following molecules would be expected to exhibit a tetrahedral geometry?

• NH3
• CH2O
• CH4
• H2O

What is the molecular shape of a CCl4 molecule?

• bent
• tetrahedral
• linear
• trigonal planar

Which of the following compounds would NOT be expected to exhibit a linear molecular geometry?

• carbon dioxide, CO2
• hydrogen sulfide, H2S
• beryllium fluoride, BeF2
• hydrocyanic acid, HCN

Which of the following molecules would be expected to exhibit a trigonal planar geometry?

• CH2O
• H2O
• CH4
• NH3

The following picture shows a covalent molecule. Which AB#U# label is correct?

• AB2
• AB3
• AB2U
• AB3U

What is the shape of a CO2 molecule?

• linear
• bent
• trigonal planar
• Tetrahedral