Physical & Chemical Changes
By: Laurel Parsley
change in state, breaking up in to smaller peices.
You can tell it is chemical if the object releases a gas (bubbles), odor, precipitate (when a solid is formed from a reaction), changes temp, or if the color changes.
Water reacts with the Iron and creates rust .
Types of Reactions
Exothermic-- When the reactants release the energy/heat.