1. Chemical Reactions

2. Evidence for a Chemical Reaction
Color Change
Solid(Precipitate) forms
Gas is released ex. Bubbles
Energy is given off or absorbed in the form of heat or light

3. Chemical Equations
Chemical reactions are represented by chemical equations
Reactants Products
Mass of reactants = mass of products
Law of Conservation of Mass- atoms are not created or destroyed in a chemical reaction
Yield

4. Chemical Equations Chemical equations also identify
The physical state of each reactant and product
Condition of reaction
Amount of each compound needed

5. Balancing Chemical Equations
Since no atoms can be created or destroyed in a reaction:
The number of atoms on the product side must be the same as the number of atoms on the reactant side
Use an atom inventory to balance the elements