You’ve probably seen that graph that shows what happens when frozen water is heated and changes state until it’s a gas (http://www.kentchemistry.com/links/Matter/HeatingCurve.htm). If so, you may have thought something like “Wow, this is beautiful, but there’s a LOT more info here that I can understand.”
In this lab, we’ll actually take class time (3 days), give students ice that they heat until it melts into a liquid and then later becomes a gas, while they take temperature readings every 2 minutes. Then they’ll graph their results, and what they’ll see is that beautiful graph that they completely understand.
UPDATE- here’s a super-simple handout I made for students. It should simply things, and save time. ALSO- second time around I did one setup of this for the class instead of each group having their own.