1. Write a testable question about the materials you see in front of you.
Must wear uniforms/IDs!
9/27/16
EBHS
Admit Slip
Write a testable question about the materials you see in front of you.
Date:
9/27/16
Topic:
Soap & Water Lab
Page # ___

2. Learned new vocab about water
Previous Water Lab
Learned new vocab about water

3. Water Vocab Review Polar Hydrogen Bonding Cohesion Adhesion
Universal Solvent
Specific Heat
Molecule with uneven charges
The bonds between two different water molecules
When water sticks to itself (ex. pile on penny)
When water sticks to something else (ex. rain on glass)
Water can dissolve almost any substance
The amount of energy it takes to raise 1 g water 1 degrees Celsius

4. Surface Tension
Hydrogen bonds between water molecules keep them together, and allow objects to rest on top

5. Soap & Water
What happened to the number of water droplets the penny could hold when it had soap on it?
Why do you think that happens??
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6. Today’s Question:
How does the type of soap impact water’s surface tension?
Design & carry out an experiment.

7. Experimental Design What are key components?
-Testable Question (share!)
-Identify Variables (share!)
-Specific Procedure (smiley face!)
-Analyze Data

8. Control Group*
The setup in an experiment that does NOT receive the changed variable
(With liquid experiments, the control is usually just water)

9. Water & Soap Lab
Question: How does the type of soap affect the number of water droplets that can fit on a penny?
Materials:
Hypothesis:
Procedure: BE CLEAR AND SPECIFIC!! Data: Make a table! (Do multiple trials)

10. How does soap impact the hydrogen bonding between water molecules?
Debrief
Which soap had the greatest impact on water surface tension? How do you know?
How does soap impact the hydrogen bonding between water molecules?

11. Soap weakens hydrogen bonds
Which soap weakened the hydrogen bonds the most? How do you know?

12. Homework Experimental Design MCAS questions
Can begin early if time allows…