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Biology 2.2
AP
22
Biology
12th Grade
10/05/2010

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Term
what is the maximum number of bonds an H20 structure can form?
Definition
4
Term
define "cohesion"
Definition
attraction of like molecules
Term
why does cohesion occur?
Definition
water is polar and it forms hydrogen bonds
Term
define "adhesion"
Definition
attraction between unlike molecules
Term
what is the importance of cohesion and adhesion?
Definition
cohesion; forms column of water in xylem
adhesion; keeps column from falling
Term
water has a high degree of?
Definition
surface tension
Term
why does water resist change in temparture?
Definition
speed of molecules need to be increases and bonds need to be broken (hydrogen bonds)
Term
why is having high specific heat important?
Definition
water can absorb large amounts of heat with small changes in weather
Term
why does it take a lot of energy to convert liquid water to a gas?
Definition
to convert liquid to gas molecules must speed up and hydrogen bonds must be broken. also it keeps water in liquid state
Term
why does ice float?
Definition
ice is less dense than liquid
Term
what happens to H bonds when water is frozen?
Definition
max number of hydrogen bonds are locked together
Term
why does water dissolve polar and ionic compounds?
Definition
water is polar
Term
what is the importance of water being a versatile solvent?
Definition
helps transport materials in blood
Term
H<3>O+
Definition
Hydronium
Term
OH-
Definition
Hydroxide
Term
if [H+=10^7] then pH =?
Definition
7
Term
if [H+]=10^-9 then [OH-]=?
Definition
10^-5
Term
if [H+]=10^-9 then pH=?
Definition
9
Term
if [H+]=10^-9 then pOH=?
Definition
5
Term
buffers do what?
Definition
maintain homeostasis
Term
a major buffer system in blood is?
Definition
Bicarbonate
Term
when H+ increases the equilibrium shifts which direction?
Definition
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