What is a molecule?

Luca in grade 2 started a science experiment today about molecules.
First Ms. Klaudt turned on the kettle and got it just about boiling. Then we got to go up and see that the molecules were jumping. They were jumping around because they were hot. Ms. Klaudt had a plate  of ice that she put over the kettle. The steam went around it and the then over it. The steam stuck to the bottom of the plate of ice- started with tiny spots but then got bigger. Then she turned the kettle off and we saw that there was only a tiny bit of steam. That meant that the water was getting colder and the molecules stopped jumping.

After that we went to our groups and did a place mat about what we saw. We could use words or draw pictures of our ideas.