Convert the chemical names into chemical formulas. Place them based on the chemical equation.
Magnesium + iron(lll) chloride
Then balance the chemical equation .meaning there are equal numbers of atoms on each side.
( if you need help with balancing,..here is a great article to help u)
Here are some simple covalent formulas that you will find useful to remember
Sulfur Dioxide or Sulphur Dioxide
Here are some simple ionic formulas that you will find useful to remember
Sulfuric Acid or Sulphuric Acid