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13. Look at drawing

14. Element: IV

Compound:III

15. Subscript and different chemical substance

16.a. 3 Hydrogen; 4 oxygen; 1 phosphorus

b. 1 sodium; 1 Oxygen, 1 Hydrogen

c.  1Solfur; 4 Oxygen

17. Look at drawing

18.NahCO₃ +HCl ---------> NaCl+ H₂O + CO₂

b. C6 H12 O6+ 06 ------> H₂O+ H₂O+H₂O+H₂O+H₂O+H₂O+CO₂+CO₂+CO_{2 (there aren't enough Oxygen elements)}