1. Types of Chemical Reactions

2. Standards
Know that chemical reactions involve the rearrangement of atoms, and that they occur on many timescales
Understand the types of chemical reactions

3. Chemical Reaction
When one or more substances undergo changes to produce one or more different substances.
This can occur on many timescales, from a fraction of a second to thousands of years.

4. Chemical Reaction
Reactions are represented by a series of symbols called a chemical equation.
Reactants = the starting materials, located on left side of equation
Products = the end materials or what is produced, located on right side of equation
 means yields or forms
Ex:
eggs + butter + sugar + flour  cookies
Or, NaOH + HCl  NaCl + H2O
There are 5 types of chemical reactions.

5. Composition/Combination/Synthesis
A + B  AB
Elements and compounds combine to form a new compound.
Multiple reactants and single product.
Examples:
2Mg + O2  2MgO
CaO + H2O  Ca(OH)2

6. Decomposition
AB  A + B
A compound breaks down into elements or more simple compounds
Single reactant and multiple products
Examples
2H2O  2H2 + O2
H2CO3  H2O + CO2

7. Single Replacement A + BX  B + AX
One element replaces a similar element in a compound
Element and compound as both reactants and products
Examples
Zn + CuSO4  ZnSO4 + Cu
Mg + 2HCl  H2 + MgCl2

8. Double Replacement AX + BY  AY + BX
Two compounds react to form two new compounds
Two compounds as both reactant and product
Examples
NaCl + AgNO3  NaNO3 + AgCl
CaCO3 + 2HCl  CaCl2 + H2CO3

9. Combustion CxHy + O2  CO2 + H2O
Organic compound (contains C and H) reacts with oxygen to form carbon dioxide and water
Organic compound and oxygen as reactants and water and carbon dioxide as products
Examples
CH4 + 2O2  CO2 + 2H2O