Naming types of Reactions for Equations

i already solved the equations but still need help naming types of reactions for these equations. please help me,thanks!

1) Mg + Br2 ----> MgBr2

2) BaCl2 + CuSO4 ----> BaSO4 + CuCl2

3) Na2O + H2O ----> 2NaOH

4) MgSO4.7H2O ----> MgSO4 + 7H2O

A general thing to look for is oxidation numbers, this will tell you whether or not you have a redox reaction or not.  Another thing to know is your solubilities; what ions form precipitates in solutions?  A third type of reaction is the formation of a gas such as H2S or H2CO3 (H2O + CO2).  Acid/Base reactions are always good to look for.

Make sure when you do your molecular equations that you have the phases of each compound as this information is important.

5 main type of reactions

Double replacement      AB + CD --> AD + CB
Single Replacement      A + BX --> B + AX
Synthesis                  A + B --> AB
Decomposition            AB --> A + B
Combustion                Rxn with O2