ICE CREAM

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 42 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 Milk1/3 cup sugar1 tsp. Vanilla

ICE AND SALT MIXTURE Supplies are in the back Fill a gallon size bag

Half full with iceAdd 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 itPass 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.