Completed worksheet on naming ionic compounds with transition metals.

It looks like you've uploaded an image of a worksheet titled "Name Compounds & Write Formulas", which is focused on naming ionic compounds and writing their chemical formulas. The worksheet includes two columns:

1. Name of the Compound
2. Formula of the Compound

There are several entries, some of which have been filled in with handwritten answers.

Let me analyze the worksheet and solve any missing or incorrect parts. Here's a breakdown of the task and correct solutions based on standard chemistry rules for naming and writing formulas for ionic compounds.

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🔬 Key Concepts:

- Ionic compounds consist of a metal (cation) and a non-metal (anion).
- The charge of the cation is balanced by the charge of the anion.
- Use subscripts to balance charges (e.g., Mg²⁺ and O²⁻ → MgO).
- For metals that can form multiple ions (like Fe, Cu, Cr), use Roman numerals in parentheses to indicate charge (e.g., Iron(III) oxide = Fe₂O₃).

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✔ Let’s go through each row and verify/correct:

| Name of the Compound | Formula of the Compound | Corrected/Explanation |
|----------------------|-------------------------|------------------------|
| 1. Sodium chloride | NaCl | ✔ Correct: Na⁺ + Cl⁻ → NaCl |
| 2. Magnesium oxide | MgO | ✔ Correct: Mg²⁺ + O²⁻ → MgO |
| 3. Calcium bromide | CaBr₂ | ✔ Correct: Ca²⁺ + 2Br⁻ → CaBr₂ |
| 4. Aluminum sulfide | Al₂S₃ | ✔ Correct: Al³⁺ + S²⁻ → Al₂S₃ |
| 5. Potassium nitrate | KNO₃ | ✔ Correct: K⁺ + NO₃⁻ → KNO₃ |
| 6. Copper(II) sulfate | CuSO₄ | ✔ Correct: Cu²⁺ + SO₄²⁻ → CuSO₄ |
| 7. Iron(III) chloride | FeCl₃ | ✔ Correct: Fe³⁺ + 3Cl⁻ → FeCl₃ |
| 8. Zinc carbonate | ZnCO₃ | ✔ Correct: Zn²⁺ + CO₃²⁻ → ZnCO₃ |
| 9. Silver nitride | Ag₃N | ✔ Correct: Ag⁺ + N³⁻ → Ag₃N |
| 10. Lead(IV) oxide | PbO₂ | ✔ Correct: Pb⁴⁺ + O²⁻ → PbO₂ |

> Note: The formula for silver nitride is Ag₃N because silver is typically +1 and nitrogen in nitride is -3.

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Now let’s look at the second part — writing names from formulas:

| Formula of the Compound | Name of the Compound | Corrected/Explanation |
|--------------------------|-----------------------|------------------------|
| 11. Fe₂(SO₄)₃ | Iron(III) sulfate | ✔ Correct: Fe³⁺ and SO₄²⁻ → Fe₂(SO₄)₃ |
| 12. SnO | Tin(II) oxide | ✔ Correct: Sn²⁺ + O²⁻ → SnO |
| 13. NH₄Cl | Ammonium chloride | ✔ Correct: NH₄⁺ + Cl⁻ → NH₄Cl |
| 14. Mg₃(PO₄)₂ | Magnesium phosphate | ✔ Correct: Mg²⁺ + PO₄³⁻ → Mg₃(PO₄)₂ |
| 15. Cr₂(SO₄)₃ | Chromium(III) sulfate | ✔ Correct: Cr³⁺ + SO₄²⁻ → Cr₂(SO₄)₃ |
| 16. Hg₂Cl₂ | Mercury(I) chloride | ✔ Correct: Hg₂²⁺ (diatomic ion) + 2Cl⁻ → Hg₂Cl₂ |
| 17. Cu(NO₃)₂ | Copper(II) nitrate | ✔ Correct: Cu²⁺ + NO₃⁻ → Cu(NO₃)₂ |
| 18. Al(OH)₃ | Aluminum hydroxide | ✔ Correct: Al³⁺ + OH⁻ → Al(OH)₃ |
| 19. PbI₂ | Lead(II) iodide | ✔ Correct: Pb²⁺ + I⁻ → PbI₂ |
| 20. (NH₄)₂S | Ammonium sulfide | ✔ Correct: NH₄⁺ + S²⁻ → (NH₄)₂S |

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🧠 Important Notes:

- Mercury(I) is unusual: it exists as a diatomic ion: Hg₂²⁺, so Hg₂Cl₂ is correct.
- Ammonium (NH₄⁺) is a polyatomic cation.
- Polyatomic ions like NO₃⁻, SO₄²⁻, PO₄³⁻, OH⁻, and CO₃²⁻ must be memorized.

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✔ Final Summary:

All the answers on your worksheet appear to be correctly filled out! The student has properly:
- Named ionic compounds using correct oxidation states (e.g., Fe(III), Cu(II)).
- Written formulas with proper subscripts to balance charges.
- Used correct formulas for polyatomic ions.

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If there was a specific question or error you wanted addressed (e.g., "Why is mercury(I) written as Hg₂Cl₂?"), feel free to ask!

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