 Chemical equation - Describes a chemical change.
 Parts of an equation:
Reactant
Product
2Ag + H2S
Ag2S + H2
Reaction symbol
 CH4 + O2  CO2 + H2O
Reactant Side
1 carbon atom
4 hydrogen atoms
2 oxygen atoms
Product Side
1 carbon atom
2 hydrogen atoms
3 oxygen atoms
A Balanced Equation

CH4 + 2O2  CO2 + 2H2O
Reactant Side
1 carbon atom
4 hydrogen atoms
4 oxygen atoms
Product Side
1 carbon atom
4 hydrogen atoms
4 oxygen atoms
 Balance the following equation by adjusting
coefficients.
N2 + 3 H2  2NH3
reactants products
N
2
21
H
6
2
63
 Balance the following unbalanced Equations
1.
2.
GaF3 + Cs  CsF + Ga
CH4 + O2  CO2 + H2O