These were really interesting- I'm glad Lise made one of them! (film canister cannon looks like the most fun). I will keep this link for the future when I might have time to attempt to do one of these with my soon to be six year old son.
The plastic H bomb experiment helped me to get a grasp on the electrolysis of H2O into hydrogen and oxygen gasses.... what is going on at the cathode and the anode.... a bit better than the fuel cell one.... I'm regretting not taking the chemistry lab class through community college, because I think that would be the best way to really understand, but there are only so many hours and months and years. Sigh.
The metal that melts in hot water was interesting--- I learned about "Field's Metal", a non-toxic fusible alloy that melts at a low temp: bismuth+tin+indium.
It's used in fire sprinkler systems-- the temp gets hot enough, melts the metal, and then water sprays out! I took a lot of notes from this one, about pure substances vs. mixtures ... Trust me.
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