You will need:
2 drinking glasses
Give each child a glow stick. Have then look at the stick only. Ask them what they notice. What does it look like, in its original form. Have them gently rock the stick back and forth. Does it do anything? Now go into a darker room, gently bend the stick, observe what happens, and note it. Now put the sticks into the ice water, observe what happens. Leave the glow sticks in the ice water for five minutes, then return to observe the results. Now put the glow sticks in the warm water, observe and note what happens. Leave the glow sticks in the warm water for 5 minutes, then observe your final results. If you have a dead glow stick, in other words it doesn't glow anymore, stick it in both types of water and observe what happens. I won't give you our results, that ruins the fun.
We are also doing a Physics experiment today, which I will share another day, baking, and art.