Help creating balanced equations?

I'm doing this lab for Chemistry, and the only thing I can't figure out is the balanced equations.

1. Iron (IIII) and Copper (II) Sulfate. It's a decomposition reaction, if that's important to know.
2. Lead (II) Nitrate and Potassium Iodide. This is a synthesis reaction.
3. Magnesium metal and hydrochloric acid. Single replacement.
4. Electrolysis of water. Double replacement.
5. Burning magnesium. Combustion.

Question

Help creating balanced equations?

I'm doing this lab for Chemistry, and the only thing I can't figure out is the balanced equations.

1. Iron (IIII) and Copper (II) Sulfate. It's a decomposition reaction, if that's important to know.
2. Lead (II) Nitrate and Potassium Iodide. This is a synthesis reaction.
3. Magnesium metal and hydrochloric acid. Single replacement. 
4. Electrolysis of water. Double replacement.
5. Burning magnesium. Combustion.

anonymous · Answer

If more information is needed, just let me know.

anonymous · Answer

Or at least teach me how to do one, so I can figure out the others.