February 7

Water Lab Make-Up

Instructions

• Follow the PowerPoint• Click on the links to see the video demo for

each topic• Answer the questions

• Try some of these at home, if you can.

Properties of Water

• Important Terms:• Capillary Action• Heat Capacity• Polarity• Adhesion• Cohesion

Adhesion

• Sticks to something else

Cohesion

• Sticks to itself

Capillary Action

• Capillary Action is the ability of a liquid to flow against gravity.

• Make a hypothesis about what you think will happen.

• Video: The Tissue Bridge

Where is each occurring in the demo?• Adhesion?• Cohesion?

How Water Works

• Answer the viewing questions on the Properties of Water worksheet as you watch

• Video: How Stuff Works – Water• ~35 min long

• More difficult alternate: Look up the answers online

Heat Capacity

• Heat capacity is how much heat is needed to raise the temperature of a substance by 1˚ C

• For example:

Heat Capacity

• Honolulu, Hawaii – High (Feb 5, 2014): 78 F (12:53 PM)– Low (Feb 5, 2014): 68 F (12:53 AM)– Past 10 days: ~10 degree difference

• Yuma, AZ– High (Feb 5, 2014): 70 F (1:57 PM)– Low (Feb 5, 2014): 53 F (11:57 PM)– Past 10 days: ~20-30 degree difference

Heat Capacity

• Video: Balloons on Fire

• Which has a greater heat capacity: – Air or water?

• Why?• What evidence is there to back up your

conclusion?

Surface Tension

• How many drops can you fit on a penny?• Video: Penny • What shape does the water make?

• Try a penny smeared with dish soap• Video: Penny with Soap

Surface Tension

• Water Strider• (Yes, it’s that guy from Top Gear.)

• In Spaaaaaaace– Where do you see adhesion?– Where do you see cohesion?

Polarity

• Water Bending

• Rub a balloon on the cloth. Hold the balloon to a trickle of water. What happens?

• Why does the water move towards the balloon (or PCV pipe)?