Water

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

Water Molecule: I’m POLAR!!!!!

www.ualr.edu/~botany/ botimages.html

Hydrogen Bonds

www.chemistry.mtu.edu/ 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 < liquidIce floats !!!B/c of Hydrogen bonding!

Density

www.aquadyntech.com/ 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.

http://www.offthemarkcartoons.com/cartoons/2005-03-05.gif

QuestionIf 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

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3. Universal Solvent

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

The Solution ProcessNegative side of water molecules will surround positive cations

The Solution ProcessPositive side of water molecules will surround negative anions

The Solution Process

Solvation Movie Solvation Animation

Draw this! The Solution Process

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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 TensionForce that pulls adjacent

water molecules together at the surface creating an “invisible skin”

Makes it less penetrable by solidsAllows insects to walk on water

Surface Tension

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Surface Tension

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

Try the two experiments as directed by your teacher

Floating the paperclipDrops on a penny

Surface Tension

Common to all liquidsLiquids want to minimize surface area form droplets

Other Properties of Water

High heats of fusion and vaporization

High boiling point