The Properties of Water(On your paper copy the station name and number, and each box/data table) Class Set

Station 1: The Water Molecule

  1. Using the model pieces you have been given construct 3 water molecules.
  2. Draw on in the 1st box and label the Oxygen, hydrogen, and covalent bonds.
  3. Now arrange the 3 molecules to show how

They would form hydrogen bonds. When

You are done show your teacher to get a

Stamp, and draw your 3 molecules in box

2. Label the oxygen, hydrogen, and

Hydrogen bonds

Station 2: Capillary Action, Adhesion, and Cohesion

  1. Tape a strip of paper towel to the pencil
  2. Put a small amount of water in the bottom of the beaker
  3. Arrange so that the tip of the paper towel is just touching the water
  4. Wait a few minutes….

Station 3: Hydrophobic/Hydrophilic

  1. Using the pipet provided, create a puddle about the size of a dime on a piece of wax paper, and a piece of glass.
  2. Using the tip of the pipet, drag each droplet around on its surface.

Station 4: Surface Tension

  1. Using the pipets provided, see how many drops of each solutions you can fit on the pennies.
  2. Do 3 trials and find the average. Table 1:______

Trial / Water Droplets on Penny / Alcohol Droplets on Penny
1.
2.
3.
Average

Station 5:Measurement of pH

  1. Use the pipet provided to place a small drop of each solution on the pH paper that has been provided
  2. Wait 1 minute, then compare the paper to the color scale provided]

Solution / pH / Acid, Base, Neutral?
Water
Ammonia
Bicarbonate
Vinegar

Discussion Questions

  1. What does it mean to say that water is a polar molecule?
  2. Because of waters polarity, what type of bonds does it form that weakly hold its molecules together?
  3. What is the term for molecules of the same substance sticking to each other?
  4. Water also sticks to other things thanks to these special properties, what is the term for something that sticks to other substances?
  5. Summary…
  6. Water is said to be polar because ______. This causes weak bonds to form between molecules called ______. These bonds explain why water sticks to itself in droplets (______), and why its sticks to other surfaces (______).
  7. Because water is a polar molecule, non-polar substances are repelled by water. What is the term for a substance that is repelled by water?
  8. In living organisms, cell membranes keep what is inside the cell separate from what is outside of the cell. They are made mostly of lipids and some proteins. Based on what you learned today, do you think lipids are hydrophilic or hydrophobic?
  9. An acid is a solution with a higher concentration of ______ions and a pH of ______.
  10. A base is a solution with a higher concentration of ______ions and a pH of ______.