Ice Cream and Phase Change • We are going to start with a liquid and change it to a solid. • What is this phase change called? • What needs to happen to the energy level in our liquid to make it become a solid? • How are we going to change the energy level?
Ice Cream • You will be working in groups of 4 • 2 members of your group will get the ice cream mixture ready. • The other 2 members will get the ice and salt mixture ready.
ice cream mixture • Supplies are on the front table • Place in 1 quart size bag • 2 cups Milk • 1/3 cup sugar • 1 tsp. Vanilla
ice and salt mixture • Supplies are in the back • Fill a gallon size bag • Half full with ice • Add ½ cup rock salt
Next Step • Place Masking Tape over the opening of the bag with your ice cream mixture. • This will help to prevent salt water getting into your ice cream.
Next Step • Place your ice cream bag into the bag that has your ice/salt mixture. • Try to get the ice to surround your ice cream bag. • Shut the large bag.
Next Step • Wrap your bag in 5 or 6 sheets of newspaper. • Newspaper and tape can be found in the back of the class room.
Next Step • Use masking tape to secure paper around your bag. • Do not be excessive with your tape.
Next step • Keep your bag in constant motion for 20 minutes. • Shake it • Pass it • Keep it moving, but be careful you don’t want a hole to form in either bag. (Salt tastes bad!)
Next Step • After you have kept it moving for 20 minutes it is now time to check and see if your ice cream is done. • It should have become a soft solid. • If it’s done divide it between the members of your group and enjoy. • Cups , napkins, and spoons are located at a lab station on the side of the room.
Clean UP! • Put ice/salt mixture in one of the two back sinks. • Throw away plastic bags. • After you have finished eating your ice cream throw away your cups, spoons, ext. and make sure your table is clean.