Water workbench.concord.org/.../ act_sol_water.html

Water Molecule: I’m POLAR!!!!! botimages.html

Hydrogen Bonds pages/courses/class.php... Draw this

Unique Properties of Water  Because water is polar and can form hydrogen bonds  it has a few unique properties

2. Density  Density of solid < liquid Ice floats !!! B/c of Hydrogen bonding!

Density watermolecule.html

Take a look at the sample  The magnets represent the bonds.  See how the crystal is larger than when disorganized.

Density  Ice acts an insulator and keeps large bodies of water from freezing solid.

Question If the properties of water changed and solid water would become more dense than liquid water what would happen? Would pond life still be able survive in the winter? Explain.

Question  if solid ice more dense than water  ponds would freeze solid  animal and plant life would die

Water’s Dissolving Ability users.rcn.com/.../ BiologyPages/S/S.html

3. Universal Solvent  Because of its polar nature, water can easily dissolve many substances and is commonly known as the “Universal Solvent”

The Solution Process Negative side of water molecules will surround positive cations

The Solution Process Positive side of water molecules will surround negative anions

The Solution Process  Solvation MovieSolvation Movie  Solvation AnimationSolvation Animation

Draw this! The Solution Process users.rcn.com/.../ BiologyPages/S/S.html

4. High Specific Heat Capacity  Water absorbs a large amount of heat as it vaporizes  Helps moderate our climate!

Specific Heat Capacity It takes more energy to raise the temperature of water than almost anything else. Watch the demonstration

5. Surface Tension  Force that pulls adjacent water molecules together at the surface creating an “invisible skin”  Makes it less penetrable by solids Allows insects to walk on water

Surface Tension cwx.prenhall.com/.../ media_portfolio/11.html additives/products_by_...

Surface Tension wine1.sb.fsu.edu/.../ Forces/Liquids/Forces03.htm

Try the two experiments as directed by your teacher  Floating the paperclip  Drops on a penny

Surface Tension  Common to all liquids  Liquids want to minimize surface area  form droplets

Other Properties of Water  High heats of fusion and vaporization  High boiling point