Q: Which molecule below has a net dipole moment of zero?

Carbon dioxide ($$\text{CO}_2)$$

Q: Which of the following molecules can form hydrogen bonds with water?

Methanol ($$\text{CH}_3\text{OH})$$

Q: Which of the following is the strongest acid based on the given $$\text{p}K_a$$ values?

Acetic acid ($$\text{p}K_a = 4.76)$$

Q: Which of the following best describes a Brønsted–Lowry base?

A substance that accepts a proton ($$\text{H}^+).$$

Q: Which of the following is the correct relationship between acid strength and $$\text{p}K_a$$?

A lower $$\text{p}K_a$$ means a stronger acid.

Question 1

Which of the following statements best describes a polar covalent bond?

Accepted Answer

A bond in which electrons are shared unequally, resulting in partial charges on the atoms.

Question 2

Given the electronegativities: $$	ext{C} = 2.5$$, $$	ext{O} = 3.5$$, $$	ext{H} = 2.1$$, which bond is the most polar?

Accepted Answer

$$	ext{O-H}$$

Question 3

Which molecule below has a net dipole moment of zero?

Accepted Answer

Carbon dioxide ($$	ext{CO}_2)$$

Question 4

What is the formal charge on the sulfur atom in dimethyl sulfoxide ($$	ext{(CH}_3)_2	ext{SO}$$)?

Accepted Answer

$$+1$$

Question 5

Which of the following best explains why acetic acid ($$	ext{p}K_a = 4.76) is a $$stronger acid than methanol ($$	ext{p}K_a = 15.54$$)?

Accepted Answer

The conjugate base of acetic acid is stabilized by resonance.

Question 6

Which of the following is a Lewis acid?

Accepted Answer

$$	ext{BF}_3$$

Question 7

What is the correct expression for the dipole moment ($$\mu) of a $$molecule?

Accepted Answer

$$\mu = Q 	imes r$$

Question 8

Which of the following molecules can form hydrogen bonds with water?

Accepted Answer

Methanol ($$	ext{CH}_3	ext{OH})$$

Question 9

Which of the following best describes the inductive effect?

Accepted Answer

The shifting of electrons in a bond in response to the electronegativity of nearby atoms.

Question 10

Which of the following statements about resonance structures is FALSE?

Accepted Answer

Resonance structures can differ in the arrangement of atoms.

Question 11

Which of the following is the strongest acid based on the given $$	ext{p}K_a$$ values?

Accepted Answer

Acetic acid ($$	ext{p}K_a = 4.76)$$

Question 12

Which of the following best describes a Brønsted–Lowry base?

Accepted Answer

A substance that accepts a proton ($$	ext{H}^+).$$

Question 13

Which of the following interactions is most important for the structure of DNA?

Accepted Answer

Hydrogen bonds

Question 14

Which of the following compounds is a Lewis base?

Accepted Answer

$$	ext{CH}_3	ext{NH}_2$$

Question 15

A molecule has a dipole moment of $$1.85\ 	ext{D}. $$Which molecule is it most likely to be?

Accepted Answer

Water ($$	ext{H}_2	ext{O})$$

Question 16

Which of the following best explains why $$	ext{CO}_2$$ has a dipole moment of zero?

Accepted Answer

The molecule is nonpolar because the bond dipoles cancel due to its linear geometry.

Question 17

Which of the following is the correct relationship between acid strength and $$	ext{p}K_a$$?

Accepted Answer

A lower $$	ext{p}K_a$$ means a stronger acid.

Question 18

Which of the following best describes the role of a curved arrow in resonance structures?

Accepted Answer

It shows the movement of a pair of electrons.

Question 19

Which of the following is NOT a type of noncovalent interaction?

Accepted Answer

Resonance stabilization

Polar Covalent Bonds, Acids, and Bases: Study Notes for Physics with Calculus Students

Guida di studio - Domande di pratica

Study guide - Flashcard