Q: Which of the following is the correct formula for calculating the formal charge of an atom?

$$\text{Formal Charge} = \text{Valence Electrons} - (\text{Nonbonding Electrons} + \frac{1}{2} \times \text{Bonding Electrons})$$

Question 1

Which of the following elements will possess the most valence electrons?

Accepted Answer

Cl

Question 2

Which of the following species has bonds with the most ionic character?

Accepted Answer

NaBr

Question 3

Which of the following is NOT a physical property attributed to metallic bonding?

Accepted Answer

Brittleness

Question 4

Calculate the difference in electronegativity values between carbon and fluorine using the Pauling scale ($$C = 2.5$$, $$F = 4.0).$$

Accepted Answer

$$1.5$$

Question 5

Which of the following bonds is the most polar?

Accepted Answer

C–F

Question 6

How many lone pairs are on the central atom in the hydrogen sulfide molecule, H$$_2S$$?

Accepted Answer

2

Question 7

Which of the following statements is true regarding the octet rule?

Accepted Answer

Some elements can have expanded or incomplete octets.

Question 8

Determine the formal charge of the nitrogen atom found within the ammonia molecule, NH$$_3.$$

Accepted Answer

$$0$$

Question 9

Which element within the thiocyanate ion, $$\ce{NCS^-}$$, possesses a negative charge?

Accepted Answer

N

Question 10

Which of the following molecules is most likely to have an incomplete octet?

Accepted Answer

BF$$_3$$

Question 11

Which of the following best describes the relationship between bond length and bond strength in a series of compounds holding bonds between the same two atoms?

Accepted Answer

The greater the bond strength, the shorter the bond.

Question 12

Which compound would you expect to have the highest melting point based on lattice energy?

Accepted Answer

AlF$$_3$$

Question 13

Which of the following compounds possesses the strongest ionic bond?

Accepted Answer

MgBr$$_2$$

Question 14

Which of the following is NOT a property explained by metallic bonding?

Accepted Answer

Brittleness

Question 15

Which of the following best describes the electrons involved in metallic bonding?

Accepted Answer

Valence electrons that move freely between metal atoms

Question 16

Which of the following molecules has the greatest dipole moment?

Accepted Answer

HCl

Question 17

Which of the following statements about resonance structures is correct?

Accepted Answer

The actual structure is a hybrid of all resonance forms.

Question 18

Which of the following best describes the effect of increasing ionic charge and decreasing ionic radius on lattice energy?

Accepted Answer

Lattice energy increases

Question 19

Which of the following is the correct formula for calculating the formal charge of an atom?

Accepted Answer

$$	ext{Formal Charge} = 	ext{Valence Electrons} - (	ext{Nonbonding Electrons} + \frac{1}{2} 	imes 	ext{Bonding Electrons})$$

Question 20

Which of the following best explains why CO$$_2 is a $$nonpolar molecule despite having polar bonds?

Accepted Answer

The molecule is linear and the bond dipoles cancel each other out.

Chemical Bonding: Concepts, Structures, and Energetics

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