Some chemical reactions change temperature, change color, produce a gas, or make a solid from two liquids. Try this reaction and see what it does! Pour 1 tablespoon of hydrogen peroxide into a cup.

Every chemical reaction involves a change in energy because different substances hold different amounts of energy. During the reaction, bonds inside the substances that are reacting together must ...

chemical changes happen when chemical reactions occur ... that has been boiled and changed state to a gas (evaporation) can cool down and return to its liquid state (condensation).