Question 1

Which of the following statements best explains why HF molecules align in an electric field, as shown in the diagram?

Accepted Answer

HF has a permanent dipole moment due to the difference in electronegativity between H and F, causing the molecules to align with the field.

Question 2

Given the following electronegativity values: H = 2.1, Cl = 3.0, what type of bond is present in HCl?

Accepted Answer

Polar covalent bond

Question 3

Which of the following molecules has a linear molecular geometry according to VSEPR theory?

Accepted Answer

CO2

Question 4

What is the formal charge on the central nitrogen atom in the correct Lewis structure for NF3?

Accepted Answer

$$	ext{FC} = 0$$

Question 5

Which of the following molecules is an example of an expanded octet?

Accepted Answer

SF6

Question 6

Which of the following best describes the bond in Cl2?

Accepted Answer

Nonpolar covalent bond with electrons shared equally

Question 7

Which of the following molecules is predicted to be nonpolar based on its geometry and bond polarity?

Accepted Answer

SiCl4

Question 8

What is the approximate bond angle in a molecule with a tetrahedral geometry?

Accepted Answer

$$109.5^\circ$$

Question 9

Which of the following is NOT a resonance structure of the nitrate ion ($$	ext{NO}_3^-$$)?

Accepted Answer

A structure with two N=O double bonds and one N–O single bond, with negative charge on the N.

Question 10

Which of the following molecules has a trigonal bipyramidal electron geometry but a linear molecular geometry?

Accepted Answer

XeF2

Question 11

Which of the following best explains why the bond angle in H2O is less than the ideal tetrahedral angle?

Accepted Answer

The presence of two lone pairs on oxygen increases electron repulsion, compressing the bond angle.

Question 12

Which of the following bonds is the strongest according to average bond energies?

Accepted Answer

$$	ext{N≡N}$$

Question 13

A molecule has four electron groups: three bonding pairs and one lone pair. What is its molecular geometry?

Accepted Answer

Trigonal pyramidal

Question 14

Which of the following statements about bond length and bond strength is correct?

Accepted Answer

Shorter bonds are generally stronger than longer bonds.

Question 15

Which of the following molecules is an exception to the octet rule due to an incomplete octet?

Accepted Answer

BF3

Question 16

Which of the following best describes the electron distribution in a polar covalent bond?

Accepted Answer

Electrons are shared unequally, resulting in partial charges ($$\delta^+$$ and $$\delta^-) on $$the atoms.

Question 17

Which of the following molecules has a square planar molecular geometry?

Accepted Answer

XeF4

Question 18

Calculate the formal charge on the sulfur atom in the Lewis structure of H2SO4 shown below, where sulfur forms two double bonds with oxygen and two single bonds with OH groups.

Accepted Answer

$$	ext{FC} = 0$$

Question 19

Which of the following best explains why NaCl is classified as an ionic compound?

Accepted Answer

Na and Cl have a large difference in electronegativity, resulting in electron transfer from Na to Cl.

Question 20

Which of the following molecules has a net dipole moment?

Accepted Answer

CH2O

Chemical Bonding I: Lewis Structures, Molecular Shapes, and Bond Properties

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