I need help balance these equations, please!?

Question

(Give each reaction type & balance each equation ;use: synthesis, composition, decomposition, single replacement, double replacement, or combustion reactions.)

1) The making of magnesium bromide.

2) Barium chloride reacting with copper (II) sulfate.

3) Sodium oxide is mixed with water.

4) MgSO4 * 7 H2O is heated.

thanks so much!

Answer 1

I'll start you off:

Mg + Br2 ----> MgBr2

BaCl2 + CuSO4 ----> BaSO4 + CuCl2

Na2O + H2O ----> 2NaOH

MgSO4.7H2O ----> MgSO4 + 7H2O

Now look at the definitions of each of the types of reactions that you stated, and see which fits. Is there, for example, any combustion reaction here?