Pour a couple of tablespoons of white vinegar into a small bowl and add a teaspoon of baking soda. The mixture should fizz up with lots of bubbles.
Pour a couple of tablespoons of warm water into a small bowl and add a teaspoon of baking powder. The mixture will make a fizzing noise and slowly begin to fizz. It will turn cloudy and have lots of small bubbles.
Now you know what to look for, go and test your ingredients today!