What are some testibale questions for a 5th grade science fair?

- Water Distillation
- Surface Tension
- Hard Boiled Egg through an open bottle trick
- Cloud in a bottle

Good luck!

I did this for fifth grade and got into the science fair and won 2nd place
 Question:What do liquids do to our bones?
You will need 
5 chicken bones
Separate cups of
coke
vinegar
milk
lemon juice
and water
You will need one bone for each cup of liquid
This project will take  one month
Every week you will take out each bone and examine the effect that liquid has on the bone. 
But dont throw out the cups
I threw out the vinegar because it smelled horrible and the teacher deducted some points because of that.
Hope I helped!