Question 1

Which of the following statements best describes the difference between a Lewis structure and the actual molecular geometry of CCl$$_4$$?

Accepted Answer

Lewis structures show all atoms in the same plane, but the actual molecular geometry of CCl$$_4 is $$tetrahedral with atoms at the corners of a tetrahedron.

Question 2

According to the VSEPR model, what is the electron domain geometry and approximate bond angle for a molecule with three electron domains around the central atom?

Accepted Answer

Trigonal planar, $$120^	ext{o}$$

Question 3

Which molecule has a trigonal bipyramidal electron domain geometry and a linear molecular geometry?

Accepted Answer

XeF$$_2$$

Question 4

A molecule has four electron domains around its central atom: two bonding pairs and two lone pairs. What is its molecular geometry and bond angle?

Accepted Answer

Bent, $$\u003c109.5^	ext{o}$$

Question 5

Which of the following molecules is always non-polar if all outer atoms are the same?

Accepted Answer

Trigonal bipyramidal

Question 6

What is the hybridization of the central atom in SF$$_6$$?

Accepted Answer

$$sp^3d^2$

Question 7

Which statement about sigma ($$\sigma) $$and pi ($$\pi) $$bonds is correct?

Accepted Answer

$$\sigma$$ bonds have electron density along the internuclear axis, while $$\pi$$ bonds have electron density above and below the axis.

Question 8

In the molecule CH$$_3$$COOH (acetic acid), what is the electron domain geometry and bond angle around the central carbon of the carboxyl group?

Accepted Answer

Trigonal planar, $$120^	ext{o}$$

Question 9

Which of the following molecules is polar due to its molecular geometry, even if all outer atoms are the same?

Accepted Answer

Square pyramidal

Question 10

What causes the potential energy to rise above zero when two nuclei in a covalent bond are brought very close together?

Accepted Answer

Repulsion between the positively charged nuclei

Question 11

Which of the following best describes the orbital overlap in the C-H bond of methane (CH$$_4$$)?

Accepted Answer

Overlap of a carbon $$sp^3$$ hybrid orbital with a hydrogen $$1s$$ orbital

Question 12

How many sigma ($$\sigma) $$and pi ($$\pi) $$bonds are present in the molecule C$$_2H$_2 ($$acetylene)?

Accepted Answer

3 $$\sigma$$ bonds and 2 $$\pi$$ bonds

Question 13

Which molecule has a square planar molecular geometry and is non-polar if all outer atoms are the same?

Accepted Answer

XeF$$_4$$

Question 14

What is the hybridization of the central atom in NH$$_3$$?

Accepted Answer

$$sp^3$$

Question 15

Which of the following molecules is non-polar due to its symmetry, even though it contains polar bonds?

Accepted Answer

CO$$_2$$

Question 16

In formaldehyde (CH$$_2O$$), how many unhybridized p orbitals are present on the carbon atom?

Accepted Answer

1

Question 17

Which of the following best explains why the bond angle in H$$_2O is $$less than $$109.5^	ext{o}$$?

Accepted Answer

Lone pairs on oxygen repel bonding pairs more strongly, reducing the bond angle

Question 18

What is the molecular geometry and polarity of SO$$_3$$?

Accepted Answer

Trigonal planar, non-polar

Question 19

Which molecule has a seesaw molecular geometry and is polar?

Accepted Answer

SF$$_4$$

Question 20

In the molecule BeF$$_2$$, what is the hybridization of the central atom and the resulting geometry?

Accepted Answer

$$sp$$ hybridization, linear geometry

Chapter 9: Molecular Geometry and Bonding Theories – Study Notes

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