1. Objectives
To learn to identify the characteristics of a chemical reaction
To learn the information given by a chemical equation =

2. Chemical reactions involve a rearrangement of the ways atoms are grouped together.
A chemical equation represents a chemical reaction.
Reactants are shown to the left of an arrow.
Products are shown to the right of the arrow.

3. In a chemical reaction atoms are not created or destroyed.
Mass is neither created or destroyed
The Law of Conservation of Mass
All atoms present in the reactants must be accounted for in the products.
Same number of each type atom on both sides of arrow

4. Balancing a Chemical Equation
Unbalanced equation
Balancing the equation
The balanced equation CH O2  CO H2O

5. Physical states of compounds are often given in a chemical equation.

6. Make a list and describe all the things that a chemical equation tells us
Include numerical and descriptive components
Explain which Chemical Law is inherent in a balanced equation