My kids are very interested in chemistry, so I thought I’d teach them how to balance chemical equations. First, we discussed how substances sometimes change when they are heated or combined, but the basic elements that make them up remain the same (conservation of mass). I gave them an example equation of 2 H2O = O2 + 2 H2. I created 2 H2O molecules using colored marshmallows, and then explained that if the water molecules were broken apart they would recombine and instead of water could become O2  and H2. I took the first 2 “molecules” apart and demonstrated how they could recombine, and allRead More →