Lecture 4

Question 1

Water has 3 _____ and _____ forms

Answer 1

natural and unique

Question 2

Water is a ___ molcule

Answer 2

POLAR ( half pos half neg)

Question 3

Oxygen is more ____

Answer 3

electronegative ( more pull on the electrons)

Question 4

Polar Covalent

Answer 4

Sharing of pair of electrons UNEQUALLY

Question 5

Emergent Properties

Question 6

Cohesion

Answer 6

2 likes attracted to each other

Question 7

Adhesion

Answer 7

2 UNLIKES attract

Question 8

Surface Tension

Answer 8

resist external forces due to molecules

Question 9

Surface to water example

Answer 9

unlike

Question 10

water on water example

Answer 10

like

Question 11

Moderation of Temperature

Answer 11

AVG 57F

Question 12

Specific Heat

Answer 12

Amount of heat energy that it takes 1G of substance needs to raise temp 1 Centigrade/1cc.

Question 13

Water specific heat

Answer 13

1 calorie

Question 14

Alcholo specifc heat

Answer 14

.6 calorie

Question 15

Water vs Alcholol specific heat

Answer 15

Easier to change temp of alchollo than water

Question 16

High Heat Vaporization WATER VS ALC

Answer 16

Water = 580 calories All = .6 calories

Question 17

Water vs Alc High Heat Vaporization meaning

Answer 17

Easier to vaporize ALC than Water

Question 18

Breakage of H- bonds

Answer 18

Specific Heat

Question 19

4C

Answer 19

Water is MOST DENSE ( not frozen)

Question 20

During 4C….

Answer 20

H-bonds between and among SHORTEN

Question 21

0C

Answer 21

Frozen ; less dense = floats

Question 22

Water is the ____ of life

Answer 22

SOLVENT

Question 23

like dissolves like….

Answer 23

polar dissolves polar

Question 24

Hydration Shell

Answer 24

rings of water around every ion

Question 25

Hydrophillic

Answer 25

Attracts water

Question 26

Why does a towel absorb water

Answer 26

The cotton is full of polar ions, attract water

Question 27

Hydophobic

Answer 27

Rjects water ; oils, waxes, glass plastic

Question 28

Why do waxes, oiles, glass, plastic reject water?

Answer 28

Nonpolar surfaces/ substances

Question 29

Ph balance

Answer 29

7

Question 30

Below 7

Answer 30

Acid

Question 31

Above 7

Answer 31

Base/ Alkaline

Question 32

Acids

Answer 32

increase H+ concentration/ions to solution

Question 33

Bases

Answer 33

reduce/pull out H+ ions in concetration

Question 34

Ammonia does what

Answer 34

Pulls out H+

Question 35

Buffers

Answer 35

Minimizes changes to pH

Question 36

Carbonic Acid Bicarbonate ion buffer system ; pH blood level

Answer 36

CAB sends H+ to lower blood pH, keeps pH balance at 7.4