BIOLOGY UNIT 2 BIOCHEMISTRY NOTES: WATER
Cohesion of Water Molecules
____Hydrogen___________ bonding between the
____positively____________ charged hydrogen (H+) and
___negatively___________ charged oxygen (O-)
(opposites attract or polarity) of another water molecule
making it as if water forms a web.
Adhesion of Water Molecules
Hydrogen bonding between the positively charged
hydrogen (H+) of water and another substances
moleculesmaking water ___climb___________, resulting in
_____capilary__________ ____action_______________.
Changing States
___Hydrogen ______________bonds are
formed to bring together a ____a
solid__________ or break apart into a
__liquid___________ or a __gas__________.
BIOLOGY UNIT 2 BIOCHEMISTRY NOTES: WATER
Why can water change states?
Due to its’ _____specific______________ _____heat_____________, which is defined as the amount of
heat one gram of a substancemust absorb or lose to change its temperature by one degree
___Celsius_____________.
This amount for water is one calorie, or ______________ Joules.
Water is a Universal Solvent
Because it is able to __dissolve______________ most other
substances.
Example: Which is solvent and which is solute? Circle.
Water (Dissolver or Solvent) and Salt (Dissolved or Solute)
Why can water dissolve most substances?
The _____hydrogen____________ side of each water molecule carries a __positive____________
charge, while the __oxygen_____________ side carries a ___negative_______________ charge.
This helps water dissociate __ionic_______________ compounds into their positive and negative ions.
The positive part is attracted to the ___oxygen______________ side of water while the negative part is
attracted to the __hydrogen________________ side of water.
BIOLOGY UNIT 2 BIOCHEMISTRY NOTES: WATER
Why don’t nonpolar substances dissolve in water?
Even when you mix oil and water together they still separate. The oil floats to the top because it is
__less_________ dense; therefore, oil and water don’t mix because water is more
___attracted__________to itself than to even the negatively charged oil.
Why is a solid, like ice, considered unique?
Most substances are _more_____________dense when they are a __solid_______________, but not
water, solid ice __floats_____________and can act as an____insulator______________.
H bonds form a ___crystal_______________, keeping the molecules further apart and therefore
___less_________ dense.