1. Synthesis (Combination) Reactions
Two or more reactants (A and B) combine to form a single product (AB)
element + element  compound
A B  AB
2Na Cl  2NaCl 2

2. Try These…
Mg + N2  Cs + P4  K + O2  Complete Practice #2 page 259

3. Decomposition Reactions
Breaking down of a compound into smaller compounds or separate elements. It is the reverse of a synthesis reaction Compound  element + element AB  A + B 2NaCl  2Na + Cl2

4. Try These…
AuCl3  MgF2  CsI  Complete practice #2 page 260

5. Single Replacement Reactions
A reactive element (metal or non metal) and a compound react to produce another element and a compound. Element + compound  element + compound A + BC  B + AC (where A is a metal) A + BC  C + BA (where A is a non-metal)

6. Al + CuCl2 . Cu gets replaced with Al
Al + CuCl2  ? ** Cu gets replaced with Al ** Al + CuCl2  Cu + AlCl3 Now balance the equation: 2Al + 3CuCl2  3Cu + 2AlCl3

7. Try These…
PbCl4 + Al  CuF2 + Mg Cl2 + CsBr  Complete Practice #2 page 261

8. Double Replacement Reactions
This usually involves two ionic solutions that react to produce two other ionic compounds. One of the compounds forms a precipitate (floats in the solution, then settles and sinks to the bottom)
Think of double date
AB CD  AD + CB

9. For Example…
K3PO4 + MgI2  ? Think…. AB + CD  AD + CB So… K3PO4 + MgI2  KI + Mg3(PO4)2 Don’t forget to balance! 2K3PO4 + 3MgI2  6Kl + Mg3(PO4)2

10. Lets Practice….
CaS + NaOH  ? AlCl3 + CuNO3  ? AgNO3 + Na2CrO4  ? Complete Practice Problem #2 page 262

11. Neutralization (Acid-Base) Reactions
When an acid and a base are combined, they will neutralize each other. In a neutralization (acid-base) reaction, an acid and a base react to form a salt and water. acid + base  salt + water Example: HBr + NaOH  H2O + NaBr Try: Practice Problems #1d and #2 page 263

12. Hydrocarbon + oxygen  carbon dioxide + water
Combustion Reactions
The rapid reaction of a compound or element with oxygen to form an oxide and produce heat. Compounds that contain oxygen also react with oxygen to form carbon dioxide and water.
Hydrocarbon + oxygen  carbon dioxide + water
CH + O2  CO2 + H2O

13. For example: CH4 + O2 . This is the easiest reaction
For example: CH4 + O2  ? This is the easiest reaction! The products will always be carbon dioxide and water! So… CH4 + O2  CO2 + H2O Don’t forget to balance… CH4 + 2O2  CO2 + 2H2O