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Lecture 4

BIOL 1115 Lecture 4: Biology 1115 - Water

by OneClass2337565 , Spring 2018
3 Pages
48 Views

Department
Biology
Course Code
BIOL 1115
Professor
Kenneth Nauman
Lecture
4

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WATER
1LIQUID WATER IS COHESIVE
>constantly making 3breaking H-bonds
>adhesion -H-bond 3STICK to other polar molecules
>ex .fluid Transportation in plants
2
ABSORB 3GIVE OF LARGE AMOUNTS OF E
show small Temp . change
>9water Temp , invest more E to keep breaking H-bonds
>
oceans ,lakes ,acts as neat banks keeps climates moderate
3
HIGH BOILING POINT
>
break H-bonds
>evaporative cooling (sweat )
>most water on earth is liquid =good for life !!
4ICE FLOATS
>H-bonds hold molecules acertain distance apart
>t,temp Iv molecular motion tEfor breaking H-bonds
>bonds in molecule farther apart in ice vs cold liquid less dense
>cold oceans don't freeze solid surface ice insulates
@GOOD SOLVENT
>dissolves solutes To form solutions
>water is solvers = aqueous solution
>If water molecules can H-bond to molecule surround be dissolve it
POLAR MOLECULES
>
chemistry of life =(aq )
>water soluble -hydrophilic (polar )
>non -soluble -hydrophobic (non -polar )
-
fats excluded by polar molecules
7CHEMICAL RXNS
>ex .hydrolysis

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Description
WATER 1 LIQUID WATER IS COHESIVE > constantly 3 H bonds making breaking > adhesion H bond 3 STICK to other polar molecules > ex . fluid Transportation in plants 2 ABSORB 3 GIVE OF LARGE AMOUNTS OF E show small . Temp change > 9 water , invest more E to keep H bonds Temp breaking > oceans , lakes , acts as neat banks keeps climates moderate 3 HIGH BOILING POINT > break H bonds > evaporative cooling ( sweat ) > = !! most water on earth is liquid good for life 4 ICE FLOATS > H bonds hold molecules a certain distance apart > , temp Iv molecular motion t E for H bonds breaking > bonds in molecule farther apart in ice vs cold liquid less dense > cold oceans dont freeze solid surface ice insulates @ GOOD SOLVENT > dissolves solutes To form solutions > = water is solvers aqueous solution > If water molecules can H bond to molecule surround be dissolve it POLAR MOLECULES > of life = chemistry ( aq ) > water soluble ( ) hydrophilic polar > non soluble ( non ) hydrophobic polar fats excluded molecules by polar 7 CHEMICAL RXNS > ex . hydrolysis
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