2. hydrochloric acid
3. potassium iodide
4. carbon monoxide
5. sulfur dioxide
6. water
7. potassium sulfide
8. aluminum iodide
9. ammonia
10. ammonium bromide
11. sodium nitrate
12. methane
13. calcium nitrate
14. aluminum hydroxide
15. potassium phosphate
16. boron trihydride
17. carbon dioxide
18. dinitrogen tetroxide
19. formaldehyde
20. sulfur hexafluoride