Chapter 3: Water and Life

Question 1

Polar molecule

Answer 1

Molecules whose overall charge is unevenly distributed

Question 2

Cohesion

Answer 2

Hydrogen bonds holding water molecules together

Question 3

Surface tension

Answer 3

A measure of how difficult it is to stretch or break the surface of a liquid

Question 4

Adhesion

Answer 4

An attraction between different substances

Question 5

Temperature

Answer 5

Average kinetic energy of the molecules in a body of matter

Question 6

Specific heat

Answer 6

The amount of heat that must be absorbed or lost for 1g of that substance to change its temperature by 1C

Question 7

Evaporation

Answer 7

Transformation of a substance from liquid to gas

Question 8

Heat of vaporization

Answer 8

The heat a liquid must absorb for 1g to be converted to gas

Question 9

Solution

Answer 9

A liquid that is a completely homogenous mixture of substances

Question 10

Solvent

Answer 10

The dissolving agent of a solution

Question 11

Solute

Answer 11

The substance being dissolved

Question 12

Aqueous solution

Answer 12

Solution in which water is the solvent

Question 13

Hydrophilic

Answer 13

Substance dissolves in water. Ex. Ionic compounds and carbohydrates

Question 14

Hydrophobic

Answer 14

Substance that does not dissolve in water. Ex. Oils and hydrocarbons

Question 15

Acid

Answer 15

Substance that increases the H concentration of a solution

Question 16

Base

Answer 16

Substance that reduces the H concentration of a solution

Question 17

Buffer

Answer 17

Substance that minimizes changes in concentrations of H and OH in a solution