Physical & Chemical Changes

By: Laurel Parsley

Physical Change

A change that doesn't affect the chemical makeup of something

eg.

change in state, breaking up in to smaller peices.

Chemical Change

A change that creates new chemical compounds.

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.

eg.

Water reacts with the Iron and creates rust .

Types of Reactions

Endothermic-- When the reactants absorb the heat/energy.


Exothermic-- When the reactants release the energy/heat.