1. Explain why the can collapsed using the Combined Gas Law where T1 is the initial temperature of the air inside the can before the can was inverted and T2 is the temperature of the air inside the can after it was plunged into the ice water.

2. Why did the can need to be inverted?

3. Adding water to the can and boiling it pushes the air molecules out of the can. Why is this step needed?

Go on Youtube and put in Can Crusher Experiment, it'll help.