How do we know when we're seeing a chemical reaction? Here are three big clues:
1. A gas is released. Sometimes you'll see this as bubbles or notice an odor (usually a different one than what you started with). And since you're probably thinking of times when your body releases gas, I'll just tell you that farting and burping aren't chemical reactions themselves, but they do mean that chemical reactions are taking place inside your body. (They smell different than the food you eat. Right??)
2. The color changes. Simple enough.
3. There's a temperature change. Sometimes that means things cool down and sometimes that means that a reaction gives off heat (and sometimes light too.) When anything burns, it's a chemical reaction.
Okay, let's put these into action and see some chemical reactions around us! I hope you're hungry for this one...