15.1 Water and its Properties

Water covers about three quarters of Earth's surface.

• True

• False

Oxygen has .............................. electronegativity than hydrogen,

• less

• a greater

O - H bond in a water molecule is ..........................

• highly polar

• highly nonpolar

In general, polar molecules are attracted to one another by ............................. interactions.

• metalic

• ionic

• dipole

Hydrogen bonds are attractive forces that arise when a ..................... atom is covalently bonded to a very electronegative atom.

• oxygen

• hydrogen

• helium

Hydrogen bonds .................................... covalent bonds.

• are as strong as

• are not as strong as

• are as weak as

The inward force, or pull, that tends to minimize the surface area of a liquid is called ..........................................

• surface area

• gravity

• surface tension.

A ............................. is any substance that interferes with the hydrogen bonding between water molecules and thereby reduces surface tension

• surfactant

• catalyst

• buffer

Adding a detergent to beads of water on a greasy surface....................... surface tension.

• reduces

• improves

• stabilizes

An extensive network of .......................................... holds the molecules in liquid water to one another.

• metallic bonds

• hydrogen bonds

• ionic bonds