Polar and Nonpolar Molecules and Properties

The attraction that an atom has for shared electrons in bonds is

• electron affinity.

• electronegativity.

• electropositivity.

• electromagnetism.

Excluding the Noble gas family, where on the Periodic Table are the elements with the highest electronegativity located?

• upper right

• lower right

• upper left

• lower left

Phosphorus has an electronegativity value of 2.1. Chlorine's electronegativity value is 3.0. What type of bond will these two elements form?

• ionic

• nonpolar covalent

• polar covalent

• metallic

When two atoms of the same nonmetal element bond together, they form a(n)

• ionic bond.

• nonpolar covalent bond.

• polar covalent bond.

• James Bond.

Which of the following pairs of elements is most likely to form an ionic bond? (You should refer to a Periodic table.)

• sulfur and oxygen

• sulfur and fluorine

• sodium and sulfur

• oxygen and fluorine

True or False: Molecules that contain polar bonds are always polar.

• True

• False

In order to determine if a molecule is polar, you must consider the

• polarity of bonds and symmetry of the molecule.

• number of electrons and number of bonds.

• polarity of bonds only.

• total charge of each ion and number of multiple bonds.

Polar molecules have

• no charges.

• slight positive and negative charges on opposite ends of the molecules.

• only positive charges.

• either positive or negative charges, but not both.

All of the following molecules have polar bonds. Which of the following molecules IS NOT polar? (You might need to draw Lewis structures.)

• H₂0

• NH₃

• CH₄

• CH₃F

Why is it difficult to wash oil from your hands with plain water?

• Both substances are polar. Like polarities repel.

• Both substances are nonpolar. Like polarities repel.

• Water is nonpolar, and oil is polar, so they will not combine.

• Water is polar, and oil is nonpolar, so they will not combine.