The Science of Water. We are surrounded by water; we are made of water. Water in our World. Water is necessary for life Water in our atmosphere helps to keep the planet warm Our bodies are composed of and dependent on water.
We are surrounded by water; we are made of water
Of some of the science basics
What are some of the properties of water that make it so essential to life on our planet?
protonAll Matter is Composed of Atoms
Representation of a nucleus
Red dots represent areas of probability
Why do we care about what atoms are made of?
Like charges repel
Unlike charges attractElectric Charge
Nature always wants to be in the lowest energy state!
Source: ibchem.com/IB/ibfiles/ bonding/bon_img/cov3.gif
Click the image above to view the animation in your web browser, or go to http://nanosense.org/download/finefilters/Nacl_SD.mov
–Forming a Water Molecule
Orbital representations of hydrogen and oxygen
A water molecule
A water molecule, with
electron density represented by the shaded blue areas
More positive ends
More negative end
A water molecule
- means partial negative charge
+ means partial positive charge
Hydrogen bonding between water molecules
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Water molecules, with the hydrogen bonds represented by the dotted lines
Source: www.personal.psu.edu/.../ bonddiagram.gif
Source: Photo 2004 Edward Tsang
Sticks to the Leaf and Grows Larger?
Source: Adapted from http://www.ualr.edu/botany/transpiration2.gif
Density of H2O at different temperatures
Crystal lattice structure of ice
Can you imagine if ice did not float?
How do you think that would affect the world?
Click the image above to view the animation in your web browser, or go to http://nanosense.org/download/finefilters/MeltingIce.mov
Water dissolves more substances than any other liquid