Up until this point, we had discovered two important indicators of a chemical reaction:
- You can't change it back.
For example a burnt piece of paper can never become paper again.
- It creates a new substance.
For example when you combine baking soda (solid) with vinegar (liquid), you get a gas with very different properties than the original substances.
In this experiment, however, I wanted the Magical Minds to witness how chemical reactions can also create heat. (This experiment is also my way of transitioning the students away from the topic of matter and onto the topic of energy.)