BIOL 1202 Lecture Notes - Lecture 5: Logarithmic Scale

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28 Aug 2016
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BIOL 1202
Water Chemistry
H2O
Stable atom with no electric charge
Can form weak attractions (hydrogen bonds)
Water cling to polar molecules
Contributes many hydrogen bonds
LIQUID WATER
Molecules slide past each other
SOLID WATER (ICE)
Less dense
Spreads molecules apart
Due to hydrogen bonds
COHESION (as one)
Attraction to other water molecules
Responsible for water tension
ADHESIONS (sticking to others)
Attraction to other substances
Water is adhesive to any substance with which it can form hydrogen bonds
WATER STORES HEAT
HAS A HIGH SPECIFIC HEAT CAPACITY
oAmount of heat that must be absorbed or expanded to change the temperature of 1g of
a substance by 1 C
HIGH HEAT OF VAPOURIZATION
oAmount of energy required to change 1g of liquid water into a gas (586 calories)
oLarge number of hydrogen bonds
WATER AS A UNIVERSAL SOLVENT
HYDROPHILIC
Attracted to water
Water tends to exclude non polar molecules
HYDROPHILIC
Repelled by water
Hydrocarbons (C-H bond rich ; Non polar)
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