UNIT 2SEC 2.2Properties of Water

A. POLARITY1. Water = H2O

2. Oxygen and hydrogen bonded by: 3. Polar Molecule: electrons are not shared equally 4. Water = universal solvent ionic compounds

1. When ionic compounds are dissolved in water, _________________________.

POLARITY OF WATER

B. HYDROGEN BONDING

1. Hydrogen Bond- bond between a hydrogen & oxygen of 2 water molecules

a) bond btwn water molecules

b) Weakest of the three chemical bond

C. COHESION AND ADHESION1. Cohesion: attractive force btwn particles of

same kind2. Adhesion: attractive force btwn 2 unlike

substance3. Capillarity: movement of water upward against

force of gravitya) Capillarity =

WATER HAS POLAR BONDING

YOUR BODY IS 75 PERCENT WATER!

Animals lose water by Animals gain water byUrinating -DrinkingSweating -Eating FoodBreathing

ESSENTIAL USES OF WATER IN ANIMALS

CoolingChemical reactions

Transport food & waste

Makes up most of body fluids

PLANTS DEPEND ON WATER.Plants use water

forPhotosynthesisChemical reactionsTransportation

Plants absorb waterthrough their roots

E. DESCRIBING SOLUTIONS

A. Solutions: mixture where substances are distributed evenly

1. Solute2. Solvent3. Aqueous solution:

F. ACIDS AND BASES

A. Dissociation of water1. Dissociation: breaking water into a positive &

negative charge particle2. Acids:

1. Solution containing more hydronium ions (H+)

F. ACIDS AND BASES

3. Bases:1. Solution containing more hydroxide ions (OH-)

4. pH scale: measures how base or acidic

An acid produces H+

A base absorbs H+