General Biology 111

Front 1

Molecular formula of water

Back 1

H2O

Front 2

Structural formula of water

Back 2

Front 3

Why are water molecules are polar

Back 3

H 2.2 O 3.4 there is more than .5 difference in electromagnetic charge

Front 4

Hydrogen bond between water molecules

Back 4

the attraction between oppositely charged regions of polar molecules

Front 5

Cohesion

Back 5

hold together

Front 6

Adhesion

Back 6

Attraction to charged surfaces

Front 7

Hydrophilic

Back 7

Attraction to water - Charged substances dissolve in water

Front 8

Hydrophobic

Back 8

Repelled by water - noncharged won't dissolve in water

Front 9

Liquid water is necessary for life on earth

Back 9

because 75% of living things are water and water is necessary for cell processes as well as regulate temperature and environment

Front 10

Water's high heat capacity is important to living things as a temperature buffer

Back 10

It helps regulate environmental temperature and since all living things are made of mostly water they are better able to resist change of their temperature

Front 11

Water's high heat vaporization is important to living things

Back 11

change from liquid to gas requires significant energy so evaporation from surface takes away heat and helps stabilize temperature

Front 12

Why does ice float

Back 12

Water is one of the few substances that becomes less dense in solid form. If ice sank then eventually ponds lakes and ocean would freeze solid

Front 13

Water is the basis of scientific measurement

Back 13

calorie (cal) + amount of heat it takes to raise the temperature of 1 gram of water by 1 degree. 1g= 1mL at sea level. It is based on water

Front 14

Aqueous solution

Back 14

solute dissolved in water

Front 15

Molarity (M)

Back 15

Moles of solute per liter solution

1M solution= 1 mole (6x10 ^23) of solute in 1L of solition

Front 16

Formula for concentration using Molarity

Back 16

(Molecular weight)(L)(M)=________g

Divided by 1000 for mL

Front 17

Percentage %

Back 17

Grams of solid solute per mL of a solution

100% solution = 1g of solute in 1mL of solution

or = 1mL of solute in 1mL of solution

Front 18

Formula concentration using Percentage

Back 18

(percent in desimal)(mL)=_________g/mL

multiply by 1000 if L

Front 19

pH

Back 19

is the hydrogen concentration in an aqueous solution.

Front 20

pH Scale

Back 20

The higher the hydrogen concentration the lower the number on the pH scale.

Front 21

Acidic

Back 21

0-6.99

Front 22

Basic

Back 22

7.01-14

Front 23

Buffer

Back 23

A chemical substance that maintains the pH of a solution. By either donating a hydrogen or accepting a hydrogen from the solution