CHAPTER 2.3 WATER

Question 1

POLAR MOLECULE

Answer 1

A molecule that has regions of positive and negative charge.

Question 2

HYDROPHILIC

Answer 2

“Water loving” ; describes a class of molecules with which water can undergo hydrogen bonding.

Question 3

HYDROPHOBIC

Answer 3

“Water fearing” ; describes a class of molecules poorly able to undergo hydrogen bonding with water.

Question 4

SOLVENT

Answer 4

A liquid capable of dissolving a substance.

Question 5

AQUEOUS

Answer 5

Watery.

Question 6

NON POLAR

Answer 6

Describes molecules that do not have regions of positive and negative charge.

Question 7

HYDROPHOBIC EFFECT

Answer 7

The exclusion of non polar molecules by polar molecules, which drives processes such as the formation of cell membranes and the folding of proteins.

Question 8

HYDROGEN BOND

Answer 8

A bond between a hydrogen atom in one molecule and an electronegative atom in another molecule.

Question 9

COHESION

Answer 9

Attraction between molecules; one consequence of cohesion is high surface tension.

Question 10

ACIDIC

Answer 10

Describes a solution in which the concentration of protons is higher than that of hydroxide ions (the pH is lower than 7).

Question 11

Why do containers of water, milk, soda, or other liquids sometimes burst when frozen?

Question 12

What are the three unusual properties of water, and why do these properties make water conducive to life?