Here is a super simple student lab sheet for your little learners to use along with the ice cream in a bag experiment. This lab focuses on changing states of matter.
This product is simple enough that it doesn't detract from the joy of the experiment (or take up much time), yet it effectively checks for understanding and helps you make sure they learned something!
If you're not familiar with how to make ice cream in a bag, Google can help! (Pro tip: double-bag the cream :)