U NIT 2 S EC 2.2 Properties of Water. A. P OLARITY 1.Water = H 2 O 2.Oxygen and hydrogen bonded by: 3.Polar Molecule: electrons are not shared equally.

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Presentation transcript:

U NIT 2 S EC 2.2 Properties of Water

A. P OLARITY 1.Water = H 2 O 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, _________________________.

P OLARITY OF W ATER

B. H YDROGEN B ONDINGH YDROGEN B ONDING 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. C OHESION AND A DHESION 1. Cohesion: attractive force btwn particles of same kind 2. Adhesion: attractive force btwn 2 unlike substance Adhesion 3. Capillarity: movement of water upward against force of gravity a) Capillarity =

W ATER HAS POLAR BONDING

Y OUR BODY IS 75 PERCENT WATER ! Animals lose water by Animals gain water by Urinating-Drinking Sweating-Eating Food Breathing

E SSENTIAL USES OF WATER IN ANIMALS Cooling Chemical reactions Transport food & waste Makes up most of body fluids

P LANTS DEPEND ON WATER. Plants use water for Photosynthesis Chemical reactions Transportation Plants absorb water through their roots

E. D ESCRIBING S OLUTIONSD ESCRIBING S OLUTIONS A. Solutions: mixture where substances are distributed evenly 1. Solute 2. Solvent 3. Aqueous solution:

F. A CIDS AND B ASES A. Dissociation of water 1. Dissociation: breaking water into a positive & negative charge particle 2. Acids: 1. Solution containing more hydronium ions (H + )

F. A CIDS AND B ASES 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+

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