Question 1

Which of the following 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: $$	ext{EN}_	ext{H} = 2.1$$, $$	ext{EN}_	ext{O} = 3.5$$, what is the electronegativity difference ($$\Delta EN) $$for the O–H bond, and what type of bond is it?

Accepted Answer

$$\Delta EN = 1.4$$, polar covalent bond

Question 3

Which molecule would NOT orient itself in an electric field due to lack of bond polarity?

Accepted Answer

Hydrogen, H$$_2$$

Question 4

Arrange the following bonds in order of increasing bond polarity: H–H, O–H, Cl–H, S–H, F–H.

Accepted Answer

H–H \u003c S–H \u003c Cl–H \u003c O–H \u003c F–H

Question 5

Which of the following statements about electronegativity is TRUE?

Accepted Answer

Electronegativity generally increases from left to right across a period and decreases down a group.

Question 6

What is the bond type between potassium (K, EN = 0.8) and bromine (Br, EN = 2.8)?

Accepted Answer

Ionic

Question 7

A molecule has a bond with $$\Delta EN = 0.3. $$What is the most likely bond type?

Accepted Answer

Non-polar covalent

Question 8

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

Accepted Answer

C–F

Question 9

If a bond is represented as $$\delta^+ 	ext{H} - \delta^- 	ext{F}$$, what does this indicate about the bond?

Accepted Answer

Hydrogen has a partial positive charge and fluorine has a partial negative charge.

Question 10

Which of the following best explains why water (H$$_2O) $$has unique properties such as a high boiling point?

Accepted Answer

The O–H bonds are highly polar due to a large electronegativity difference.

Question 11

Which of the following bonds is most likely to be ionic based on electronegativity differences?

Accepted Answer

Na–Cl

Question 12

Which element has the highest electronegativity according to Pauling's scale?

Accepted Answer

Fluorine

Question 13

A student claims that the bond in Cl$$_2 is $$polar covalent. Is this correct? Why or why not?

Accepted Answer

No, because the bond is non-polar covalent since both atoms are identical.

Question 14

Which of the following best describes a dipole in a molecule?

Accepted Answer

A separation of positive and negative charges in a region of space.

Question 15

Which of the following bonds would have the smallest electronegativity difference?

Accepted Answer

H–H

Question 16

If the electronegativity difference between two atoms is 1.0, what type of bond is most likely formed?

Accepted Answer

Polar covalent

Question 17

Which of the following statements about the periodic trend of electronegativity is correct?

Accepted Answer

Electronegativity increases from left to right across a period and decreases down a group.

Question 18

Which of the following bonds is most likely to be non-polar covalent?

Accepted Answer

O–O

Question 19

Which of the following best explains why the bond in KBr is considered ionic?

Accepted Answer

The electronegativity difference is greater than 1.7.

Question 20

Which of the following is the correct order of increasing electronegativity for the elements C, N, and O?

Accepted Answer

C \u003c N \u003c O

Lesson 4.3: Electronegativity and Bond Polarity

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