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Chapter 15 15.1 . Water and Its Properties. Anticipation Guide. Think -Make a Prediction Pair - Discuss your predictions with a partner Share - Your predictions with the class. Could we live without Water?. Water covers about 70% of Earth's surface Water makes up 65-75% of our bodies .

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chapter 15 15 1

Chapter 1515.1

Water and Its Properties

anticipation guide
Anticipation Guide
  • Think-Make a Prediction
  • Pair- Discuss your predictions with a partner
  • Share- Your predictions with the class
could we live without water
Could we live without Water?
  • Water covers about 70% of Earth's surface
  • Water makes up 65-75% of our bodies.
  • Water can be in the form of…
    • Vapor
    • Ice
    • Snow
water is a simple molecule
Water is a Simple Molecule
  • 2-Hydrogen
  • 1- Oxygen
  • Oxygen has greater electronegativity
  • Oxygen has a stronger attraction to Hydrogen
  • Polar
  • Universal Solvent
surface tension
Surface Tension
  • High Surface Tension
  • Does anybody know why?
  • Hydrogen bonds are formed within the water
  • Water molecules at the surface have an unbalanced attraction and are pulled inward creating a High Surface Tension.
  • Creates a skin or elastic wrap
  • Drop of water can be seen in a spherical shape.
surfactant
Surfactant
  • Decrease surface tension
  • Interferes with the hydrogen bonding
  • Ex: Soaps or Detergents
  • Ex: Dishwashing liquid
vapor pressure
Vapor Pressure
  • Water has a Low Vapor Pressure
  • What is vapor pressure?
  • Hydrogen bonds hold the molecules in liquid water together.
  • What would happen if water had a high vapor pressure?
the density of water
The Density of Water
  • Ex: Ice Tea
  • Solid water has a lower density than liquid water.
  • As it begins to freeze its density increases until….(Refer to chart 15.1 pg. 492)
  • Why is ice less dense than liquid water?
  • Open framework of molecules in a hexagonal arrangement.
practice tonight
Practice Tonight
  • Pg. 512 #84
  • Become familiar with:
    • Table 15.1 on Pg. 492
surface tension activity objectives
Surface Tension ActivityObjectives
  • Visualizing the surface tension of water.
  • Drop water onto a penny with an eyedropper.
  • Visualize the changes in surface tension when a surfactant is added to the water.
instructions
Instructions
  • One piece of paper per group.
  • List all group members names at the top of the paper.
  • Write the following on your paper:
    • # of Drops- Water Only

Prediction=

Actual # of drops=

    • # of Drops- Liquid Water and Surfactant

Prediction=

Actual # of drops=

instructions1
Instructions
  • 1. Take a clean penny and place it on a paper towel.
  • 2. Load you eyedropper with water.
  • 3. Take a guess…How many drops can a penny hold?
  • 4. Write down your guess.
  • 5. Carefully add water to the penny, one drop at a time. Counting each drop and observing the shape.
  • 6. Continue dropping water onto the penny until the surface tension breaks and the bubble collapses.
  • 7. Dry off your penny and repeat with the soapy water and a different eyedropper.