Define physical change and list several common physical changes. Section 3-2 Section 3.2 Changes in Matter Define physical change and list several common physical changes. Define chemical change and list several indications that a chemical change has taken place. Apply the law of conservation of mass to chemical reactions.

observation: orderly, direct information gathering about a phenomenon

law of conservation of mass Section 3-2 Section 3.2 Changes in Matter (cont.) physical change phase change chemical change law of conservation of mass Matter can undergo physical and chemical changes.

A phase change is a transition of matter from one state to another. Section 3-2 Physical Changes A change that alters a substance without changing its composition is known as a physical change. A phase change is a transition of matter from one state to another. Boiling, freezing, melting, and condensing all describe phase changes in chemistry.

Section 3-2 Chemical Changes A change that involves one or more substances turning into new substances is called a chemical change. Decomposing, rusting, exploding, burning, or oxidizing are all terms that describe chemical changes.

The mass of the reactants equals the mass of the products. Section 3-2 Conservation of Mass The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction, it is conserved. The mass of the reactants equals the mass of the products. massreactants = massproducts