Free Printable Naming Compounds Worksheets - Free Printable

Let's solve this Naming Chemical Compounds Worksheet step by step. We'll identify the individual ions in each compound and then determine the correct name of the compound based on standard chemical nomenclature rules.

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🔹 Key Rules for Naming:

- Ionic compounds: Name the cation first, then the anion.
- For transition metals with variable charges (e.g., Fe, Cu, Sn, Pb), use Roman numerals to indicate oxidation state.
- Polyatomic ions have specific names (e.g., SO₄²⁻ = sulfate, CO₃²⁻ = carbonate, PO₄³⁻ = phosphate, OH⁻ = hydroxide, C₂H₃O₂⁻ = acetate).
- Cations are usually metals or NH₄⁺ (ammonium).
- Anions end in "-ide" if monatomic; polyatomic ions have their own names.

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Now, let’s fill out the table:

| Formula | Individual Ions | Name of the Compound |
|-------------------|----------------------------------------------|------------------------------------------|
| NH₄Cl | NH₄⁺, Cl⁻ | Ammonium chloride |
| ZnCO₃ | Zn²⁺, CO₃²⁻ | Zinc carbonate |
| FePO₄ | Fe³⁺, PO₄³⁻ | Iron(III) phosphate |
| LiOH | Li⁺, OH⁻ | Lithium hydroxide |
| CuBr₂ | Cu²⁺, Br⁻ | Copper(II) bromide |
| SnO₂ | Sn⁴⁺, O²⁻ | Tin(IV) oxide |
| Ag₃N | Ag⁺, N³⁻ | Silver nitride |
| Pb₃P₂ | Pb⁴⁺, P³⁻ | Lead(IV) phosphide |
| CaI₂ | Ca²⁺, I⁻ | Calcium iodide |
| K₂SO₃ | K⁺, SO₃²⁻ | Potassium sulfite |
| Fe₂(SO₄)₃ | Fe³⁺, SO₄²⁻ | Iron(III) sulfate |
| Cu(C₂H₃O₂)₂ | Cu²⁺, C₂H₃O₂⁻ (acetate) | Copper(II) acetate |
| AgC₂H₃O₂ | Ag⁺, C₂H₃O₂⁻ (acetate) | Silver acetate |
| Co₃N₂ | Co³⁺, N³⁻ | Cobalt(III) nitride |

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✔ Explanation of Each Entry:

1. NH₄Cl
- NH₄⁺ is ammonium, Cl⁻ is chloride → Ammonium chloride

2. ZnCO₃
- Zn²⁺, CO₃²⁻ → Zinc carbonate (Zn only has +2 charge)

3. FePO₄
- PO₄³⁻ requires Fe³⁺ to balance → Iron(III) phosphate

4. LiOH
- Li⁺ and OH⁻ → Lithium hydroxide

5. CuBr₂
- Two Br⁻ mean Cu²⁺ → Copper(II) bromide

6. SnO₂
- Two O²⁻ = 4– total → Sn must be +4 → Tin(IV) oxide

7. Ag₃N
- Three Ag⁺ balance one N³⁻ → Silver nitride

8. Pb₃P₂
- 3 Pb and 2 P: Total charge = 0 → Let x = Pb charge:
3x + 2(-3) = 0 → 3x = 6 → x = +2? Wait! That would be Pb²⁺, but check:
Actually, P is P³⁻ → 2 × P³⁻ = 6– → 3 Pb must be 6+ → each Pb = +2 → Pb²⁺
But Pb commonly forms +2 and +4. Here, it's Pb²⁺, so Lead(II) phosphide?
Wait — wait! Let's recheck:
Pb₃P₂ → 3 Pb and 2 P
P is typically P³⁻ → 2 × P³⁻ = 6– → so 3 Pb must be 6+ → each Pb = +2 → Pb²⁺
So name: Lead(II) phosphide

✘ Wait! Earlier I said Pb⁴⁺ — that was a mistake.

Let me correct:
Pb₃P₂ → 2 × P³⁻ = 6– → 3 Pb = 6+ → Pb = +2 → Lead(II) phosphide

✔ Correction: Pb²⁺, not Pb⁴⁺

So: Individual Ions: Pb²⁺, P³⁻ → Lead(II) phosphide

9. CaI₂
- Ca²⁺, I⁻ → Calcium iodide

10. K₂SO₃
- K⁺, SO₃²⁻ → Potassium sulfite (SO₃²⁻ = sulfite, not sulfate!)

11. Fe₂(SO₄)₃
- SO₄²⁻ → 3 × SO₄²⁻ = 6– → 2 Fe = 6+ → each Fe = +3 → Iron(III) sulfate

12. Cu(C₂H₃O₂)₂
- Cu²⁺, C₂H₃O₂⁻ (acetate) → Copper(II) acetate

13. AgC₂H₃O₂
- Ag⁺, C₂H₃O₂⁻ → Silver acetate

14. Co₃N₂
- N³⁻ → 2 × N³⁻ = 6– → 3 Co = 6+ → each Co = +2 → Cobalt(II) nitride

Wait! 3 Co = 6+ → Co²⁺ → Cobalt(II) nitride

But earlier I wrote Co³⁺ — that was incorrect.

Let's double-check:
N is nitrogen, which forms N³⁻
2 N³⁻ = 6– → so 3 Co must be 6+ → each Co = +2 → Co²⁺

So correct: Cobalt(II) nitride

✘ Correction: Co²⁺, not Co³⁺

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✔ Final Corrected Table:

| Formula | Individual Ions | Name of the Compound |
|-------------------|----------------------------------------------|------------------------------------------|
| NH₄Cl | NH₄⁺, Cl⁻ | Ammonium chloride |
| ZnCO₃ | Zn²⁺, CO₃²⁻ | Zinc carbonate |
| FePO₄ | Fe³⁺, PO₄³⁻ | Iron(III) phosphate |
| LiOH | Li⁺, OH⁻ | Lithium hydroxide |
| CuBr₂ | Cu²⁺, Br⁻ | Copper(II) bromide |
| SnO₂ | Sn⁴⁺, O²⁻ | Tin(IV) oxide |
| Ag₃N | Ag⁺, N³⁻ | Silver nitride |
| Pb₃P₂ | Pb²⁺, P³⁻ | Lead(II) phosphide |
| CaI₂ | Ca²⁺, I⁻ | Calcium iodide |
| K₂SO₃ | K⁺, SO₃²⁻ | Potassium sulfite |
| Fe₂(SO₄)₃ | Fe³⁺, SO₄²⁻ | Iron(III) sulfate |
| Cu(C₂H₃O₂)₂ | Cu²⁺, C₂H₃O₂⁻ | Copper(II) acetate |
| AgC₂H₃O₂ | Ag⁺, C₂H₃O₂⁻ | Silver acetate |
| Co₃N₂ | Co²⁺, N³⁻ | Cobalt(II) nitride |

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🛠️ Summary of Corrections:

- Pb₃P₂: Pb is +2, not +4 → Lead(II) phosphide
- Co₃N₂: Co is +2, not +3 → Cobalt(II) nitride

These corrections are critical because metal oxidation states must balance the charge of the anions.

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✔ Final Answer: The completed worksheet is now accurate as shown above.