Chemistry worksheet for practicing naming and writing chemical compounds, including ionic and molecular substances.

Final Answer:
1. I
2. M
3. M
4. M
5. I
6. M
7. I
8. I
9. I
10. I
11. I
12. I
13. M
14. M
15. M
16. I
17. M
18. M
19. I
20. M

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Explanation:
Let’s go step by step — don’t worry, it’s easier than it looks!

Rule 1: If a compound has a metal + nonmetal → it’s Ionic (I).
Rule 2: If it’s only nonmetals → it’s Molecular (M).

Now let’s check each one:

1. NaOH → Sodium (metal) + Oxygen/Hydrogen (nonmetals) → I
2. HBr(aq) → Hydrogen + Bromine (both nonmetals) → M
3. H₂S(g) → Hydrogen + Sulfur (nonmetals) → M
4. HClO → Hydrogen + Chlorine + Oxygen (all nonmetals) → M
5. Cu(ClO₃)₂ → Copper (metal) + Chlorate (polyatomic ion) → I
6. H₂SO₄ → Hydrogen + Sulfur + Oxygen (nonmetals) → M
7. NaBr → Sodium (metal) + Bromine (nonmetal) → I
8. Hg(CN)₂ → Mercury (metal) + Cyanide (polyatomic) → I
9. SrCO₃ → Strontium (metal) + Carbonate → I
10. (NH₄)₂SO₄ → Ammonium (acts like metal) + Sulfate → I
11. FeO → Iron (metal) + Oxygen → I
12. Sn₃N₄ → Tin (metal) + Nitrogen → I
13. CO₂ → Carbon + Oxygen (nonmetals) → M
14. PCl₅ → Phosphorus + Chlorine (nonmetals) → M
15. SF₆ → Sulfur + Fluorine → M
16. CoCl₂ → Cobalt (metal) + Chlorine → I
17. H₂CO₃ → Hydrogen + Carbon + Oxygen → M
18. HNO₃ → Hydrogen + Nitrogen + Oxygen → M
19. Fe(MnO₄)₃ → Iron (metal) + Permanganate → I
20. Ni(NO₃)₂ → Nickel (metal) + Nitrate → I

Also remember:
- “(aq)” means dissolved in water — doesn’t change if it’s ionic or molecular.
- Polyatomic ions (like ClO₃⁻, SO₄²⁻, CN⁻) are treated as one unit.
- Metals = left side of periodic table. Nonmetals = right side.

You got this! Just look for metals vs. nonmetals.