Get 2 cups one plastic and 1 polystyrene and test which one will maintain the temperature of hot water for the longest. Record temp. every minute. I got an A when i did it
Boil cabbage in acetone, the purple pigments from the cabbage transfer to the water, therefor the water becomes purple&tge cabbage turns white, This also works for leaves boiled in alcohol....
You could try experimenting how plants react to different substances in their water, you could test which household chemicals clean rust the best, test which compounds are best for warding off moss...
