Biology Chapter 3 Water And Life

Question 1

4 emergent properties for water

Answer 1

1. Cohesive behavior
2. Ability to moderate temperature
3. Expansion upon freezing
4. Versatility as a solvent

Question 2

Cohesion

Answer 2

Is waters attraction to water (sticking together) hydrogen bonds hold water molecules together helps transport of water against gravity in plants

Question 3

Adhesion

Answer 3

Is waters attraction to other things (sticking to a surface)

Question 4

Polarity

Answer 4

Cohesion and adhesion occur

Question 5

Temperature by water is

Answer 5

Water can absorb and release heat with only moderate changes in its own temperature

Question 6

Specific heat

Answer 6

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

Question 7

Requires energy

Answer 7

Heat is absorbed when hydrogen bonds break

Question 8

Releases energy

Answer 8

Heat is released when hydrogen bonds form

Question 9

Kinetic energy

Answer 9

The energy of motion

Question 10

Thermal energy

Answer 10

Kinetic energy that is associated with the random motion of atoms or molecules

Question 11

Temperature

Answer 11

The measure of the energy that represents the average kinetic energy of the molecules in a body of matter

Question 12

Heat

Answer 12

Thermal energy in transfer from one body of matter to another

Question 13

Calorie (Cal)

Answer 13

Is the amount of heat required to raise the temperature of 1 g of water by 1C

Question 14

Kilocalories

Answer 14

Is the calories on food packages and 1kcal = 1,000 cal

Question 15

Evaporation

Answer 15

The transformation of a substance from liquid to gas

Question 16

Heat of vaporization

Answer 16

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

Question 17

Evaporative cooling

Answer 17

As the liquid evaporates, the remaining surface cools

Question 18

Sweat, panting

Answer 18

Evaporative cooling of water helps organism stabilize their temperature

Question 19

Ice is in a crystal structure

Answer 19

As water freezes the hydrogen bonds lock into place

Question 20

Water is most dense at

Answer 20

4C Celsius

Question 21

Solution

Answer 21

A homogenous mixture of substances in a liquid

Question 22

Solvent

Answer 22

The dissolving agent of a solution

Question 23

Solute

Answer 23

The substance that is dissolved

Question 24

Aqueous solution

Answer 24

A solution in which water is the solvent

Question 25

Hydrophilic

Answer 25

One that has an affinity for water polar bonds charges

Question 26

Hydrophobic

Answer 26

One that does not have an affinity for water
Oil have relatively non-polar bonds
Hydrophobic molecules make up cell membranes

Question 27

Molecular mass

Answer 27

Is the sum of all masses of all atoms in a molecule/ measured in 1 mole = 6.02 x 10^23 molecules

Question 28

Acid

Answer 28

Any substances that increases the H+ concentration of a solution

Question 29

Base

Answer 29

Is any substance that reduces the H- concentration of a solution

Question 30

Buffers

Answer 30

Are substances that minimize changes in concentrations of H+ and OH- in a solution ( helps prevent change )