Unit 1 Sec 2.2 Properties of Water

A. Polarity Water = H2O Oxygen and hydrogen bonded by: Polar Molecule: electrons are not shared equally Water = universal solvent ionic compounds When ionic compounds are dissolved in water, _________________________.

Polarity of Water

B. Hydrogen Bonding Hydrogen Bond- bond between a hydrogen & oxygen of 2 water molecules bond btwn water molecules Weakest of the three chemical bond

C. Cohesion and Adhesion Cohesion: attractive force btwn particles of same kind Adhesion: attractive force btwn 2 unlike substance Capillarity: movement of water upward against force of gravity Capillarity =

Water has polar bonding

Your body is 75 percent water! Animals lose water by Animals gain water by Urinating -Drinking Sweating -Eating Food Breathing

Essential uses of water in animals Cooling Chemical reactions Transport food & waste Makes up most of body fluids

Plants depend on water. Plants use water for Photosynthesis Chemical reactions Transportation Plants absorb water through their roots

E. Describing Solutions Solutions: mixture where substances are distributed evenly Solute Solvent Aqueous solution:

F. Acids and Bases Dissociation of water Dissociation: breaking water into a positive & negative charge particle Acids: Solution containing more hydronium ions (H+)

F. Acids and Bases Bases: pH scale: measures how base or acidic Solution containing more hydroxide ions (OH-) pH scale: measures how base or acidic

An acid produces H+ A base absorbs H+