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Biology 12 Name: _________________________________ Block: _________ Date: _______________
Unit 1 – Homeostasis; Chapter 2 – The Molecules of Cells
2.3 – The Chemistry of Water (p29-32) – STUDENT NOTES
Chemistry Review - the 3 types of chemical bonds important to biology are:
1) ____________ bond = the ___________ of electrons between a _________ ion and a ____________ ion
2) _____________ bonds = the ___________ of electrons between a _________ ion and a ____________ ion
There are 2 types of _____________ bonds
(a) in a ________________ bond, electrons are shared equally
(b) in a ________________ bond, electrons NOT equally shared.
3) _____________ bonds = is a weak polar bond ______________
___________________ molecules.
Some examples are:
Chemical Bonds form 2 types of compounds that are important to life:
____________________compounds and _______________ compounds
Today, our focus is on WATER:
Water is an ____________________ compound.
Water’s biological function/importance is due to its ______________________________
Water is a _________________________________.
How does the polarity of H2O produce H – bonding?
The oxygen atom is ________________ & _______________ charged. The hydrogen atom is ________________
& _______________ charged. Oxygen ________________ electron _______________ it creating a
Dipole.
The slightly positive __________ around the _____________ atom becomes attracted
to the slightly negative __________ around the _____________ atom of DIFFERENT water molecules
As water is a polar molecule, it has special or unique properties.
But first a note about HYDROPHILIC vs. HYDROPHOBIC substances:
Water is important to life!!! -- It has 5 unique properties – are all related to water being a polar molecule
One more quick review: Sodium Chloride = a salt made up of NaCl
A solute = salt =
A solvent = water =
Together: Solute + Solvent = ___________________
Special Property # 1: Water is a _____________________________________
Special Property # 2: Water is a _____________________________________
a)
b)
c)
Water molecules are:
Special Property # 3: Water is a _____________________________________
a)
Special Property #4: _____________Water is less dense than _______________ water
Why is this property important to living organisms?
Special Property #5: Water molecules can act as a __________ for hydrogen (H+) or hydroxide (OH-) groups
0 This makes water an important reactant for biochemical processes
HW and Review:
0 Textbook: 0 Ch2.3 Chemistry of Water p 29-320 Ch2.4 Organic Molecules p 32-330 Review questions p 56 Q#1-6, 41-48
0 Videos0 Bio12 – Biochem Playlist – videos #1 = 8
0 Water Lab Next Class