Question 1

Which of the following best explains why the lattice energy of $$\mathrm{MgO} is $$much greater than that of $$\mathrm{NaCl}$$?

Accepted Answer

Because $$\mathrm{MgO}$$ has ions with higher charges, $$\mathrm{Mg$$^{2+}$$}$$ and $$\mathrm{O$$^{2-}$$}$$, compared to $$\mathrm{Na^+}$$ and $$\mathrm{Cl^-}.$$

Question 2

Which of the following molecules has the greatest dipole moment?

Accepted Answer

$$\mathrm{H_2O}$$

Question 3

Which of the following bonds is the most polar?

Accepted Answer

$$\mathrm{O-H}$$

Question 4

Which of the following compounds is expected to have the highest lattice energy?

Accepted Answer

$$\mathrm{MgO}$$

Question 5

Place the following bonds in order of increasing bond strength: $$\mathrm{C-C}$$, $$\mathrm{C=C}$$, $$\mathrm{C\equiv C}.$$

Accepted Answer

$$\mathrm{C-C \u003c C=C \u003c C\equiv C}$$

Question 6

Which of the following statements about ionic compounds is TRUE?

Accepted Answer

Ionic compounds conduct electricity when dissolved in water.

Question 7

Which of the following best describes electronegativity?

Accepted Answer

The ability of an atom to attract electrons to itself in a chemical bond.

Question 8

Which of the following molecules is nonpolar, despite having polar bonds?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 9

Which of the following Lewis structures for $$\mathrm{CO_3$^{2-}} is $$correct, considering resonance?

Accepted Answer

The $$\mathrm{CO_3$^{2-}}$$ ion contains three equivalent $$\mathrm{C-O}$$ bonds, each with a bond order of 1.33.

Question 10

Which of the following best explains why $$\mathrm{H_2O}$$ has a bent molecular geometry?

Accepted Answer

Because the oxygen atom has two lone pairs of electrons.

Question 11

Which of the following bonds is the shortest?

Accepted Answer

$$\mathrm{C\equiv C}$$

Question 12

Which of the following molecules has the highest bond angle?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 13

Which of the following best describes a covalent bond?

Accepted Answer

A bond formed by the sharing of electrons between two atoms.

Question 14

Which of the following molecules contains a polar covalent bond?

Accepted Answer

$$\mathrm{HCl}$$

Question 15

Which of the following best describes the octet rule?

Accepted Answer

Atoms tend to gain, lose, or share electrons to achieve eight electrons in their valence shell.

Question 16

Which of the following best explains why $$\mathrm{NaCl}$$ conducts electricity when dissolved in water but not in the solid state?

Accepted Answer

Because the ions are free to move in solution but fixed in the solid.

Question 17

Which of the following best describes a resonance structure?

Accepted Answer

A structure that represents one of two or more valid Lewis structures for a molecule.

Question 18

Which of the following molecules has a trigonal planar geometry?

Accepted Answer

$$\mathrm{BF_3$}$$

Question 19

Which of the following best explains why $$\mathrm{CO_2$} is $$nonpolar even though it contains polar bonds?

Accepted Answer

Because the molecule is linear and the bond dipoles cancel.

Question 20

Which of the following best describes the bond in $$\mathrm{N_2$}$$?

Accepted Answer

A triple bond formed by sharing three pairs of electrons.

Chemical Bonding I: Lewis Theory – Study Notes and Practice

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