This is a great experiment reflection you can give for most experiments. This is geared towards 2nd-3rd graders. My unit included an in depth study of nonfiction and then my students explored questions they came up with as they learned about topics within the forces/ motion umbrella. We used the reflection after a few experiments so that students could tailor an experiment that could offer some evidence to support a hypothesis.
I can email you the Word version so that you can make appropriate changes for your group. :)