Lecture 4 Flashcards
Chapter 3; Pages 8-10
Water has 3 _____ and _____ forms
natural and unique
Water is a ___ molcule
POLAR ( half pos half neg)
Oxygen is more ____
electronegative ( more pull on the electrons)
Polar Covalent
Sharing of pair of electrons UNEQUALLY
Emergent Properties
Cohesion
2 likes attracted to each other
Adhesion
2 UNLIKES attract
Surface Tension
resist external forces due to molecules
Surface to water example
unlike
water on water example
like
Moderation of Temperature
AVG 57F
Specific Heat
Amount of heat energy that it takes 1G of substance needs to raise temp 1 Centigrade/1cc.
Water specific heat
1 calorie
Alcholo specifc heat
.6 calorie
Water vs Alcholol specific heat
Easier to change temp of alchollo than water
High Heat Vaporization WATER VS ALC
Water = 580 calories All = .6 calories
Water vs Alc High Heat Vaporization meaning
Easier to vaporize ALC than Water
Breakage of H- bonds
Specific Heat
4C
Water is MOST DENSE ( not frozen)
During 4C….
H-bonds between and among SHORTEN
0C
Frozen ; less dense = floats
Water is the ____ of life
SOLVENT
like dissolves like….
polar dissolves polar
Hydration Shell
rings of water around every ion
Hydrophillic
Attracts water
Why does a towel absorb water
The cotton is full of polar ions, attract water
Hydophobic
Rjects water ; oils, waxes, glass plastic
Why do waxes, oiles, glass, plastic reject water?
Nonpolar surfaces/ substances
Ph balance
7
Below 7
Acid
Above 7
Base/ Alkaline
Acids
increase H+ concentration/ions to solution
Bases
reduce/pull out H+ ions in concetration
Ammonia does what
Pulls out H+
Buffers
Minimizes changes to pH
Carbonic Acid Bicarbonate ion buffer system ; pH blood level
CAB sends H+ to lower blood pH, keeps pH balance at 7.4
