1. 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.

2. observation: orderly, direct information gathering about a phenomenon

3. 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.

4. 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.

5. 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.

6. 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