Question 1

Which of the following best describes the difference between ionic and covalent bonds?

Accepted Answer

Ionic bonds involve the transfer of electrons from one atom to another, resulting in oppositely charged ions, while covalent bonds involve the sharing of electrons between atoms.

Question 2

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

Accepted Answer

CaO

Question 3

Given the equation for lattice energy $$E_{cl} = \frac{\kappa Q_1$ Q_2$}{d}$$, which change would most increase the lattice energy of an ionic compound?

Accepted Answer

Decreasing the distance $$d$$ between ions

Question 4

Which statement about the octet rule is correct?

Accepted Answer

Atoms tend to gain, lose, or share electrons until they are surrounded by eight valence electrons, but there are exceptions.

Question 5

Which of the following molecules is an exception to the octet rule because it has fewer than eight valence electrons around the central atom?

Accepted Answer

BF$$_3$$

Question 6

Which of the following best explains why ionic compounds like NaCl are brittle?

Accepted Answer

The rigid, crystalline arrangement of oppositely charged ions causes the structure to cleave when layers are shifted.

Question 7

Which of the following bonds is expected to be the shortest?

Accepted Answer

N≡N triple bond

Question 8

Which of the following pairs of atoms will form the most polar covalent bond?

Accepted Answer

P—F

Question 9

What is the formal charge on the central carbon atom in the dominant Lewis structure of CO$$_2$$?

Accepted Answer

$$0$$

Question 10

Which of the following statements about resonance structures is correct?

Accepted Answer

Resonance structures have the same arrangement of atoms but different placement of electrons.

Question 11

Which molecule or ion below contains an odd number of valence electrons, making it an exception to the octet rule?

Accepted Answer

NO

Question 12

Which of the following is true about formal charges in Lewis structures?

Accepted Answer

The dominant Lewis structure is the one with formal charges closest to zero and negative charges on the most electronegative atoms.

Question 13

Which of the following compounds is most likely to be hypervalent?

Accepted Answer

XeF$$_4$$

Question 14

Which of the following best describes the trend in electronegativity across a period in the periodic table?

Accepted Answer

Electronegativity increases from left to right.

Question 15

Which of the following bonds is most likely to be ionic based on the difference in electronegativity ($$\Delta_{EN}$$)?

Accepted Answer

Mg—Cl ($$\Delta_{EN} = 1.8)$$

Question 16

Which of the following is the correct Lewis electron-dot symbol for nitrogen?

Accepted Answer

N with 5 dots

Question 17

Which of the following steps is NOT part of the standard procedure for drawing Lewis structures?

Accepted Answer

Assign formal charges to all atoms before completing octets.

Question 18

Which of the following statements about metallic bonding is correct?

Accepted Answer

Metallic bonds involve electrons that are relatively free to move throughout the metal lattice.

Question 19

Which of the following molecules contains a double bond in its dominant Lewis structure?

Accepted Answer

C$$_2H$_4$$

Question 20

Which of the following is true about the bond lengths in the resonance structure of SO$$_3$$?

Accepted Answer

All S—O bonds are of equal length and intermediate between a single and double bond.

Chapter 8: Basic Concepts of Chemical Bonding – Study Notes

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