Chapter 3: Water and Life

Question 1

Polar Covalent Bonds

Answer 1

A covalent bond between atoms that differ in electronegativity. The shared electrons are pulled closer to the more electronegative atom, making it slightly negative and the other atom slightly positive.

Question 2

Polar Molecule

Answer 2

A molecule with an uneven distribution of charges in different regions of the molecule.

Question 3

Cohesion

Answer 3

The linking together of like molecules, often by hydrogen bonds.

Question 4

Surface tension

Answer 4

A measure of how difficult it is to stretch or break the surface of a liquid. Water has a high surface tension because of the hydrogen bonding of surface molecules.

Question 5

Adhesion

Answer 5

The clinging of one substance to another, such as water to plant cell walls, in this case by means of hydrogen bonds.

Question 6

Kinetic energy

Answer 6

The energy associated with the relative motion of objects. Moving matter can perform work by imparting motion to other mater.

Question 7

Thermal Energy

Answer 7

Kinetic energy due t random motion of atoms and molecules; energy in its most random form.