How do you write these equations into balanced chemical equations?

1. Sulfur plus oxygen yields sulfur dioxide

2. Magnesium chloride plus sulfuric acid yields magnesium sulfate plus hydrogen chloride

3. Calcium carbonate yields calcium oxide plus carbon dioxide

4. Nitrogen plus hydrogen yields ammonia (NH3)

5. Hydrochloric acid plus sodium hydroxide yields sodium chloride plus water

6. Sodium plus water yields sodium hydroxide plus hydrogen gas

7. Lead (II) oxide yields lead plus oxygen

8. Copper plus silver nitrate yields silver plus copper (II) nitrate

9. Potassium chlorate yields potassium chloride plus oxygen

10. Calcium chloride plus silver nitrate yields silver chloride plus calcium nitrate

11. Oxygen plus hydrogen yields water

12. Sodium bromide plus chloride yields sodium chloride plus bromine

First step- work out what the one letter symbols for each element is. A periodic table will help.
Step two - work out how how the compounds will bind together
For example H20 is this way because the oxygen lacks two electrons in its outer shell which hydrogen can donate one each. The periodic table helps here too.
Step three - Balance both sides
Hydrogen plus oxygen --> water
2H + O --> H20