McGraw-Hill Online Learning Center Test

1. Review the image and answer the following questions.

Why is water a polar molecule?

A. because water originated as ice
B. because the oxygen atom is so much larger than the hydrogen atoms that it exerts a greater pull on the electrons, creating an area of electronegativity
C. the hydrogen atoms together create a greater pull on the electrons and cause the molecule to be polar
D. the positive charges of the hydrogen ions repel electrons, sending them toward the oxygen end of the molecule

2. What type of bond forms between each hydrogen atom and the oxygen atom of a water molecule?

A. ionic bond
B. hydrogen bond
C. covalent bond
D. double covalent bond

3. The unique molecular structure of water, its resultant polarity, and the hydrogen bonds that occur between adjacent water molecules, are responsible for what trait that is important to living organisms?

A. Water is a universal solvent.
B. Water molecules are cohesive.
C. The temperature of liquid water rises and falls slowly.
D. All of these are correct.

Copyright ©2000 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use and Privacy Policy.
McGraw-Hill Higher Education is one of the many fine businesses of The McGraw-Hill Companies.
For further information about this site contact mhhe_webmaster@mcgraw-hill.com
or let us know what you think by filling out our site survey.