Question 1

According to Valence Shell Electron Pair Repulsion (VSEPR) theory, what is the primary factor that determines the geometry of a molecule?

Accepted Answer

The minimization of repulsion between electron groups on the central atom

Question 2

What is the electron geometry of the molecule SF$$_6$$?

Accepted Answer

Octahedral

Question 3

Which of the following molecules has a bent molecular geometry?

Accepted Answer

SO$$_2$$

Question 4

In the molecule PCl$$_5$$, how many chlorine atoms occupy the equatorial positions?

Accepted Answer

3

Question 5

What is the bond angle in a molecule with a trigonal planar electron geometry?

Accepted Answer

$$120^\circ$$

Question 6

Which of the following molecules is nonpolar?

Accepted Answer

CO$$_2$$

Question 7

Determine the hybridization of the central atom in BeCl$$_2.$$

Accepted Answer

sp

Question 8

What is the molecular geometry of the ion ICl$$_4^-$$?

Accepted Answer

Square planar

Question 9

Using molecular orbital theory, what is the bond order of the O$$_2$$ molecule?

Accepted Answer

$$2$$

Question 10

Which statement best explains why CO$$_2 is $$nonpolar, even though it contains polar bonds?

Accepted Answer

The molecule has a linear geometry, causing the dipoles to cancel out

Question 11

What is the electron configuration for the F$$_2^-$$ ion using a molecular orbital (MO) diagram?

Accepted Answer

$$(\sigma_{2s})^2$ (\sigma_{2s}^*)^2$ (\sigma_{2p_z})^2$ (\pi_{2p_x})^2$ (\pi_{2p_y})^2$ (\pi_{2p_x}^*)^2$ (\pi_{2p_y}^*)^1$

Question 12

Which of the following best describes the difference between bonding and antibonding molecular orbitals?

Accepted Answer

Bonding orbitals result from constructive interference and increase electron density between nuclei; antibonding orbitals result from destructive interference and decrease electron density between nuclei

Question 13

What is the ideal bond angle for a molecule with a tetrahedral electron geometry?

Accepted Answer

$$109.5^\circ$$

Question 14

How many lone pairs reside in the equatorial position of the XeF$$_2$$ molecule?

Accepted Answer

3

Question 15

Which of the following molecules is polar?

Accepted Answer

SO$$_2$$

Question 16

What is the hybridization of the central atom in SF$$_4$$?

Accepted Answer

sp$$^3d$$

Question 17

Using the bond order formula $$	ext{Bond Order} = \frac{1}{2}(	ext{Electrons in bonding orbitals} - 	ext{Electrons in antibonding orbitals})$$, what is the bond order of the NO$$^-$$ ion?

Accepted Answer

$$2.5$$

Question 18

Which of the following statements about molecular polarity is correct?

Accepted Answer

A molecule with a perfect shape and identical surrounding atoms is nonpolar

Question 19

Which of the following molecules has sp$$^3d$^2$$ hybridization on the central atom?

Accepted Answer

SF$$_6$$

Chapter 11: Chemical Bonding II – Molecular Shapes, VSEPR & MO Theory (Study Notes)

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