Question 1

Which of the following best describes a covalent bond?

Accepted Answer

An interaction between two atoms resulting from the sharing of electrons.

Question 2

What property determines whether a covalent bond is polar or nonpolar?

Accepted Answer

The difference in electronegativity between the two atoms.

Question 3

Which of the following statements about electronegativity is correct?

Accepted Answer

Electronegativity increases from left to right across a period and from bottom to top in a group.

Question 4

A bond between two atoms with equal or very similar electronegativities is called a:

Accepted Answer

Nonpolar covalent bond.

Question 5

Which of the following best explains why water (H$$_2O) $$molecules are held together by polar covalent bonds?

Accepted Answer

Oxygen is more electronegative than hydrogen, resulting in unequal sharing of electrons.

Question 6

If a covalent bond is polar, which of the following is true?

Accepted Answer

One of the atoms has a partial negative charge.

Question 7

Which of the following is a real-life example of a polar covalent bond?

Accepted Answer

The bond between hydrogen and oxygen in a water molecule.

Question 8

Which of the following statements is true regarding nonpolar covalent bonds?

Accepted Answer

Electrons are shared equally between the two atoms.

Question 9

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

Accepted Answer

Electrons are shared unequally, resulting in partial charges on the atoms.

Question 10

Which of the following is NOT a characteristic of a nonpolar covalent bond?

Accepted Answer

The bonded atoms have unequal electronegativities.

Question 11

Given the following electronegativities: H = 2.1, O = 3.5, which type of bond forms between hydrogen and oxygen in water?

Accepted Answer

Polar covalent bond

Question 12

Which of the following best explains why Cl$$_2 is a $$nonpolar molecule?

Accepted Answer

Both chlorine atoms have the same electronegativity, so electrons are shared equally.

Question 13

Which of the following is the correct formula for calculating the difference in electronegativity ($$\Delta EN) $$between two atoms?

Accepted Answer

$$\Delta EN = |EN_1$ - EN_2$|$$

Question 14

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

Accepted Answer

Electronegativity increases as you move from left to right across a period.

Question 15

Which of the following best describes the partial charges in a polar covalent bond?

Accepted Answer

The more electronegative atom has a partial negative charge ($$\delta^-$$), and the less electronegative atom has a partial positive charge ($$\delta^+).$$

Covalent Bonds: Types, Electronegativity, and Molecular Polarity

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