Date post: | 18-Jan-2018 |
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Water
An extremely unusual chemical
Covalent Bonds
• Share electrons• “complete” one
another• Strong – hard to break
Heat capacity
• Ability to hold onto a large amount of heat
• Takes a lot of energy to raise the temperature of water
• Importance to living things?
Phoenix
Atlanta
Boise, Idaho
Providence, RI
Average daily high: 225oFAverage daily low: -243oF
So the big so what?
• Water in the atmosphere helps to moderate climate.– Kept within reasonable limits
Latent Heat
• Water gives off a large amount of heat when it changes phases
• Importance to living things?
HOMEOSTASISMaintaining steady internal
conditions
But…all is not equal
• Unequal electronegativity– Ability to attract
electrons• Do not share electrons
equally
SO WHAT?
Polar Covalent Bonds
• Unequal sharing of electrons
• Creates oppositely charged poles
• Opposites attract• Like a chemical magnet• Creates hydrogen
bonding
So What?
• Universal Solvent– Can exchange nutrients– Can exchange waste
So What?
• Medium for chemical reactions
• Participant in chemical reactions– Product of
photosynthesis = oxygen
So What?
• Adhesion
So What?
• Cohesion
So what?
• Paper clip challenge– Addition of soap
So What?
• Capillary Action
So What?
• Density