Objectives:
Part 1:
Investigate the interactions of liquids and solids. Investigate changes of state.
Materials
Per Student or Group:
4-5 ice cubes
salt in a salt shaker
plate or tray to work on (not paper!)
Key Questions
Why do the ice cubes stop slipping off when you add salt?
What To Do
1. Try to stack ice cubes into a tower.
2. Try again—but this time let the ice cubes sit out on a plate for 2–3 minutes. Then
sprinkle lots of salt on the top of each cube before putting the next one on top of it.
Extensions
Put a piece of string on an ice cube, then sprinkle it with salt. Wait a few moments, then lift the string. The water should melt then re-freeze, sticking the string to the ice cube.
Part 2: Make your own Klutz Proof Density Column
