I know you've all seen the cute root beer float lab for first and second graders where they see all three states of matter. But you can use the floats in upper grade too!
I created this one for 4-8 graders.
Review states of matter and explore the law of conservation of matter as
well as physical and chemical changes with this root beer float lab.
Students measure the parts of the float as they create it to show that
the mass stays the same. They also discuss whether a physical or
chemical change is happening.
This lab uses the 5E method (engage, explore, explain, extend, evaluate)
and includes step by step directions along with a student lab sheet.
The lab sheet is 2 pages and there are several pages of detailed teacher
directions with pictures.