One of the coolest things about chemical reactions is that they can be so unexpected. I mean, who would think you can make water explode?
Another common kitchen ingredient that produces a surprising reaction is corn flour. When you touch a flame to a spoonful of corn flour, it does burn, but nothing terribly interesting happens. But, when you blow the flour through a funnel, it reacts with the flame in a much more explosive way. This reaction is caused by the increase in surface area. When you separate the particles, there's more surface area for the oxygen to react with them, so when... more