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Try mixing baking soda and vinegar.. those are two common household items. and it can be fun to watch what happens :)

pour the vinegar into a container such as a empty water bottle, then pour about a handful of baking soda onto a tissue paper and fold the tissue paper. when your ready, put the folded tissue paper into the water bottle, close the cap tight.. shake and throw, watch the explosion and have fun :D

watch out for the kids though. I hope this helps, I remember doing this experiment at my school (you could also use this for a volcano!)

sodium in vinger make a fake volcano its fun to paint and watch explode but be careful also try to make rock candy that always is fun or u take flour and salt and a little bit of water make a doughy substance color and paint it make a desighn on the soft dough like ur hand print then bake then dough let it cool and there u go anotha fun thing to do