1. Properties and Changes in Matter

2. Properties of matter

3. Physical Properties
Can be observed or viewed without changing the sample’s composition
Example: density, color, odor, state of matter, boiling point, melting point, shape
Use your senses

4. Properties Extensive Intensive
Properties that depend on the amount of substance present
Example: Volume, mass
Properties that are independent of the amount of substance present
Can be used to identify a substance
Example: density, boiling point, temperature

5. Chemical Properties
How a substance interacts with another substance (ability or inability)
Example: iron can react with oxygen, carbon dioxide is not flammable

6. Changes in matter

7. Physical Changes Alter a substance without changing the composition
Example: bend, grind, crumple, split, phase change

8. Chemical Changes
Process in which a substance(s) is changed into one or more new substances
Example: combust, ferment, burn, rot, tarnish
Also known as a chemical reaction

9. Chemical Equation Use of symbols to represent a chemical reaction
Example: CH4 + O2 → CO2 + H2O

10. Reactants Products Starting substances
Found on the left hand side of a chemical equation
Substances formed
Found on the right hand side of a chemical equation
Have students identify reactants and products

11. Law of Conservation of Mass
Mass is neither created or destroyed during a chemical reaction
Mass of the reactants = mass of the products

12. Chemical Reaction Signs
Bubbling (gas production)
Color change
Precipitate forms (solid formation)
Energy change (temperature change)
The only way to know for sure is to check the composition before and after!!