CAULDRON BUBBLES
Cauldron Bubbles
TEACHER/OLDER KIDS WORKSHEET
Key concepts:
o Density
o Solubility
Materials list:
o Water
o Vegetable oil
o Sugar
o Plastic cup (one for each person)
Prep-time: none
Activity time: 15-20 min
References: pbskids.org
Additional activities: What other solids would work with this experiment?
Safety/clean up: oil is a slight hassle to clean up so this activity will also \ require paper towels and soap just incase there’s a spill.
Procedure:
1. Fill the cup ½ full of water
2. Add enough oil to the cup to make a thin (about ½ and inch) layer on
top of the water
3. Begin sprinkling salt on top of oil layer. What happens? ____________
__________________________________________________________
4. After the salt sinks to the bottom what happens? _________________
__________________________________________________________
5. Where are these bubbles coming from? ________________________
__________________________________________________________
Cauldron Bubbles
YOUNGER KIDS WORKSHEET
DRAW A PICTURE OF THE CUP AFTER YOU ADD THE SALT
DRAW A PICTURE OF THE CUP AFTER THE SALT IS ON THE BOTTOM
DRAW A PICTURE OF THE OIL FLOATING BACK UP
Additional activities: What other solids would this experiment work with? (Sugar?)
Safety/clean up: oil is a slight hassle to clean up so this activity will also require paper towels and soap just incase there’s a spill.
WEBSITE – pbskids.org