This is the student sheet I use to have students make ice cream in a bag. We do this at the end of our energy unit which discusses energy involved in phase and temperature changes. We also record these changes with temperature vs time graphs, heat calculations, and energy bar charts/ "LOL charts" (ASU modeling methods). This lab is fun can can be done in gallon sized bags, but I have found saving large plastic or metal containers ( dishwasher pod or coffee cans) work better.