I have homework in which it asks "Describe the difference between elements, mixtures and compounds. (I have done the first sentence as it was fairly easy. Next is the part I don't understand) You need to draw their chemical formulae (for example KCl for potassium chloride) and structural formulae (i.e. the chemical diagram for potassium chloride)".
I just dont get what it means in the fact that, I think it wants me to find the structural and chemical formulae for an element, mixture and compound however i just dont know where to begin.