The Marvels of Water: From Cells to Molecules

1. Thank God We are Worth More than 
the Sum of our Parts!!

3. Insufficient Iodine 
and Goiters

4. Maybe We Should Call it "Almost"

5. ATOMS: Organized Collection of 
Protons, Neutrons, and Electrons Helium

6. Carbon

7. Naturally Occurring Isotopes

8. Radioactive Isotopes

9. Why Electrons "Matter" 3rd 
Shell 2nd 
Shell 1st 
Shell

11. Van der Waal's Forces: Why Geckos Can Run Up the Wall

12. The Wonders of Water Why water? Water is involved in and is a common 
product of many biological reactions. H O H Water provides an environment in which 
many biological reactions take place. H O H

13. Water is Polar H2O Water is held together by covalent bonds, but oxygen 
keeps the electrons around it more than the hydrogens 
do. The result...oxygen has a slight negative charge while 
hydrogen has a slight positive charge.

14. Water is polar. Show how polarity leads to hydrogen 
bonding between 8 different water molecules. - - Hydrogen bond O H H + + Water molecule - - - - - - - - O O - - O O H H H H O H - - H + + + + + + H H H H O + + + + H H + + - - - - - - - - O O O O H H H H + + + + H H H H + + + +

15. Liquid Water Ice

16. Properties of Water wa

17. 1 Cells are made of 70-95% 
water. In addition, cells are 
surrounded by water. As a 
result _____. A the temperature of living things 
changes relatively slowly B a variety of nutrients are available 
as dissolved solutes C waste products can be easily 
removed D dissolved substances can be easily 
transported within cells or between 
cells in multicellular organisms E all of the above

18. 2 Water is polar. This means 
that _____. A the opposite ends of the water 
molecule have opposite electrical 
charges B water molecules are linear. C water is just one of the many 
hydrophobic molecules D all of the atoms in a water molecule 
have equal electronegativities E all of the above

19. 3 The partial positive and 
partial negative charges on a 
water molecule occur 
because of _____. A the unequal sharing of electrons 
between the oxygen and the 
hydrogen atoms in a water molecule B the stability of one atom of a bond 
but not the other atom C covalent bonding D ionic bonding E hydrogen's high electronegativity

20. 4 In a drop of water molecules, 
hydrogen bonds form 
between _____. A two oxygen atoms in different water 
molecules B the hydrogen atoms in two different 
water molecules C the hydrogen atom in one water 
molecule and a oxygen atom in 
another water molecule D the hydrogens in a single water 
molecule E none of the above

21. 5 You fill a glass of water to 
just slightly above the rim 
without it spilling over the 
glass. What property of 
water best explains this? A surface tension B adhesion C its thermal properties D ice is less dense than water E none of the above

22. 6 Because molecules of water 
are farther apart in ice than 
in liquid form, _____. A ice floats B ice is denser than liquid water C ice expands when it melts D ice vaporizes before liquid water 
does E all of the above

23. 7 Nonpolar molecules that do 
not interact with water 
molecules are called _____. A covalent B hydrophillic C hydrophobic D none of the above