1. KBr: Potassium Bromide
2. Cu2O: Copper (I) Oxide
3. HCl: Hydrochloric Acid
Tehncially, this is a gas and is called hydrogen chloride as a gas. If it is in aqueous solution, then it is HCl(aq), hydrochloric acid. Many people, including professional chemists, interchange these names and symbols at will.
4. N2O4: Dinitrogen Tetroxide
5. H3P: Hydrophosphoric Acid
I would call this hydrogen phosphide. The common name is phosphine
6. FeS: Iron (II) Sulfide
7. Ag2SO4: Silver Sulfate
8. HNO2: Nitrous Acid
9. Pb(CO3)2: Lead (IV) Carbonate
10. Ba(NO3)2: Barium Nitrate
11. (NH4)3PO4: Ammonium Phosphate
12. Mg(NO2)2: Magnesium Nirtrate
magnesium nitrite. NO2^- is nitrite; NO3^- is nitrate
13. IF7: Iodine Heptafluoride
14. NO: HItrogen Monoxide
15. CBr4: Carbon Tetrabromide
16. CaCO3: Calcium Carbonate
17. Na2O: Sodium Oxide
18. Cu3N2: Copper (II) Nitride
19. Sr(MnO4)2: Strontium Permanganate
20. H2S: Hydrogen Sulfide
21. N2O3: Dinitrogen Trioxide
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