1. Chemical Equations and other fun with chemistry.

2. Parts of a chemical equation
Reactants—starting substances
Products – substances that are formed in the chemical reaction
Symbols that are used:
+ separates two or more products or reactants
 separates reactants from products
Identifies a solid state
Identifies a liquid state
Identifies a gaseous state
(aq) Identifies a water solution

3. Word vs. Formula
Word equations– equations that uses words to describe a chemical reaction
Iron and chlorine react to produce iron (II) chloride
Formula equations– equations that uses chemical formulas to describe a chemical reaction
Fe(s) + Cl2(g)  FeCl2(s)

4. Types of Chemical Equations
Synthesis Reactions
When two or more reactants combine to form a product.
A + B  AB
2Fe(s) + 3Cl2(g)  2FeCl3(s)

5. Types of Chemical Equations
Decomposition Reactions
When a single reactant breaks down into two or more products
AB  A + B
2NaN3(s)  2Na(s) + 3N2(g)

6. Types of Chemical Equations
Combustion Reaction
When oxygen combines with a reactant and releases energy in the form of heat and light
2H2(g) + O2(g)  2H2O(g)
CH4(g) + O2(g)  CO2(g) + 2H2O(g)

7. Types of Chemical Equations
Replacement reactions
Replacing an element in a compound with a different element
Single Replacement
A + BX  AX + B
Cu(s) + 2AgNO3(aq)  2Ag (s) + Cu(NO3)2(aq)

8. Types of Chemical Equations
Double Replacement Reactions
AX + BY  BX + AY
KCN(aq) + HBr(aq)  KBr(aq) + HCN(g)