1. Paper Airplanes
Make a hypothesis of which airplane would fly the best between one made of copier paper and one of construction paper
Why?

2. Paper Airplanes continued
Group up by color
Make two airplanes per group
Go into the lab, throw each airplane ten times and record the measurements
Plot of a graph the distance on the x axis and the number of throws on the y axis
Which flew the furthest?
Why?

3. Paper Airplanes continued
Now, trade which ever airplane flew furthest with another group (of theirs that flew furthest)
Which is best?
What are you basing “best” on?
Consider whether it is:
Distance
Speed
Hang-time
Appearance, etc.
Why is it important to define “best”?

4. Properties of Water

5. Hypothesis Mixing Hot and Cold Water

6. Conclusion Water density! Cold water is more dense than warm water
Example:
68 degree water has a density of g/cm3
104 degree water has a density of g/cm3
So what about ice?

7. Properties Universal solvent High surface tension
Can dissolve many compounds but…
Is also the property that allows runoff and groundwater infiltration of nutrients
High surface tension
Reason water forms droplets on your windshield rather than spread out
Present in nature if all three phases (solid, liquid, gas)
Pure water has a pH of 7.0 SU
Rain can have a pH as low as 2.3 SU