Question 1

Which of the following best explains why water (H$$_2O) is a $$polar molecule?

Accepted Answer

Because the O-H bonds are polar and the molecule has a bent shape.

Question 2

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

Accepted Answer

Polar covalent

Question 3

Which molecule below has the largest dipole moment according to Table 5.2?

Accepted Answer

LiF

Question 4

Which of the following statements about resonance structures is TRUE?

Accepted Answer

Resonance structures must have the same number of electrons.

Question 5

What is the formal charge on the central nitrogen atom in the Lewis structure of NH$$_4^+$$?

Accepted Answer

$$	ext{FC} = 5 - 0 - 4 = +1$$

Question 6

Which of the following molecules has a trigonal planar electron geometry?

Accepted Answer

BF$$_3$$

Question 7

Which bond requires the most energy to break according to Table 5.3?

Accepted Answer

N≡N

Question 8

A molecule has four electron groups around the central atom, two of which are lone pairs. What is its molecular geometry?

Accepted Answer

Bent

Question 9

Which of the following molecules is nonpolar?

Accepted Answer

CO$$_2$$

Question 10

Which of the following best describes the bond in NaCl?

Accepted Answer

Ionic

Question 11

Which of the following is an exception to the octet rule?

Accepted Answer

BF$$_3$$

Question 12

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

Accepted Answer

$$109.5^\circ$$

Question 13

Which of the following molecules has a seesaw molecular geometry?

Accepted Answer

SF$$_4$$

Question 14

Which of the following best explains why CO$$_2 is $$nonpolar even though it contains polar bonds?

Accepted Answer

The molecule is linear and the bond dipoles cancel.

Question 15

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

Accepted Answer

XeF$$_4$$

Question 16

Which of the following statements about bond length is correct?

Accepted Answer

Bond length decreases as the number of shared electrons increases.

Question 17

Which of the following molecules is expected to be most soluble in water?

Accepted Answer

CH$$_3OH$$

Question 18

Which of the following best describes the electron geometry and molecular geometry of PH$$_3$$?

Accepted Answer

Electron geometry: tetrahedral; Molecular geometry: trigonal pyramidal

Question 19

Which of the following molecules contains a radical species?

Accepted Answer

OH

Question 20

Which of the following is the best Lewis structure for N$$_2O$$, considering formal charges?

Accepted Answer

$$:\mathrm{N}\equiv\mathrm{N}-\mathrm{O}:$$

Chemical Bonding: Theory, Structure, and Properties

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