1. Changes in Matter

2. Alter a substance without changing the composition
Physical
Chemical
Alter a substance without changing the composition
Process in which a substance(s) is changed into one or more new substances; also known as a chemical reaction

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

4. “to produce” or “yield”
2 H2 (g) + O2 (g) H2O (l)
coefficient
Product(s)
Reactants
“Reacts with”
“to produce” or “yield”
State of matter

5. Reactants Products Starting substances Substances formed
Found to the left of the arrow in a chemical equation
Substances formed
Found to the right of the arrow in a chemical equation

6. Law of Conservation of Mass
Mass is neither created nor destroyed during a chemical reaction
Massreactants = Massproducts

7. 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 the reaction!!!