Properties of Water EXAM 1

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special properties of water
- universal solvent
- surface tension
- solid less dense than liquid
- high heat capasity
- cohesion
- evaporative cooling
what gives water surface tension

v shaped water molecule
water polar or nonpolar

polar thus creating hydrogen bonds
4 emergent properties due to hydrogen bonds
- Cohesive behavior
- Ability to moderate temperature
- Expansion upon freezing
- Versatility as a solvent
solution

molecules mixed up (sweet tea)
solvent

doing dissolving (water)
solute

dissolved substance (sugar)
in ice vs water molecules
- ice is stable
- liquid break and reform
kinetic energy

energy of motion
heat

total kinetic energy due to motion
temperature

average kinetic engergy
adhesion

ie water to cell wall
cohesion

water to water molecule
why is water unique
- Because of the covalent bonds between the oxygen and hydrogen.
- Because of its ability to hydrogen bond.
- Because of its ability to make and break ionic bonds.
- Because the electrons are shared equally between the oxygen and hydrogen atoms.
water is a solevent
- Due to polarity and H-bonding, water dissolves many substances
- Hydrophilic – molecules attracted to water
- Hydrophobic – molecules not attracted to water
- Water causes NaCl to dissociate
acid

more H+ in solution (1-7)
neutral

H+ to OH is equal (7)
base

OH is more than H+ (7-14)
Buffer

accept or release H+ to keep PH stable
why is PH important
- homeostasis
- affect rate of chemical reaction
- affect shape
- how molecules bind together
- affect how dissolve in water

Author

misol

234100

Card Set

Properties of Water EXAM 1

Description

biology

Updated

2013-09-10T23:27:24Z

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