Chemistry worksheet for practicing naming and writing formulas of ionic and molecular compounds.

Let's go through the Nomenclature Worksheet and fill in the missing parts — either the correct name for the given formula or the correct formula for the given name.

We'll go row by row, identifying each compound and applying proper naming rules for ionic compounds, covalent (molecular) compounds, and hydrates.

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Part 1: Give the correct name for each of the following

#### 1. Barium iodide – BaI₂
- Barium is a metal that forms a +2 ion (Ba²⁺).
- Iodide is I⁻.
- So, BaI₂ → Barium iodide ✔

#### 2. Aluminium oxide – Al₂O₃
- Aluminum forms Al³⁺; oxygen is O²⁻.
- Formula: Al₂O₃ → Aluminum oxide ✔

#### 3. Iron(II) sulfide – FeS
- Iron(II) means Fe²⁺; sulfide is S²⁻.
- FeS → Iron(II) sulfide ✔

#### 4. Lead(II) iodide – PbI₂
- Pb²⁺ and I⁻ → PbI₂ → Lead(II) iodide ✔

#### 5. Arsenic trichloride – AsCl₃
- "Tri" indicates 3 Cl atoms.
- Arsenic is a nonmetal, so this is a covalent compound.
- Arsenic trichloride ✔

#### 6. Sodium hydrogenphosphate – Na₂HPO₄
- HPO₄²⁻ is hydrogen phosphate ion.
- Sodium is Na⁺ → needs two to balance charge.
- Sodium hydrogen phosphate ✔

#### 7. Zinc hydrogencarbonate – Zn(HCO₃)₂
- Zn²⁺ and HCO₃⁻ → need two HCO₃⁻ ions.
- Zinc hydrogencarbonate ✔

#### 8. Ammonium hydroxide – NH₄OH
- NH₄⁺ and OH⁻ → Ammonium hydroxide ✔

#### 9. Copper(II) bromate – Cu(BrO₃)₂
- Cu²⁺ and BrO₃⁻ → two BrO₃⁻ needed.
- Copper(II) bromate ✔

#### 10. Lithium hypochlorite – LiClO
- Li⁺ and ClO⁻ → Lithium hypochlorite ✔

#### 11. Cesium acetate – CsCH₃COO
- Cesium is Cs⁺, acetate is CH₃COO⁻ (or C₂H₃O₂⁻).
- Cesium acetate ✔

#### 12. Iron(II) oxalate – FeC₂O₄
- Fe²⁺ and C₂O₄²⁻ → one-to-one ratio.
- Iron(II) oxalate ✔

#### 13. Sodium sulfite – Na₂SO₃
- SO₃²⁻ is sulfite ion.
- Na⁺ → two needed → Sodium sulfite ✔

#### 14. Calcium carbonate – CaCO₃
- Ca²⁺ and CO₃²⁻ → Calcium carbonate ✔

#### 15. Nickel(II) dichromate – NiCr₂O₇
- Ni²⁺ and Cr₂O₇²⁻ → one-to-one → Nickel(II) dichromate ✔

#### 16. Potassium bicarbonate – KHCO₃
- K⁺ and HCO₃⁻ → Potassium bicarbonate ✔

#### 17. Mercury(I) iodide – Hg₂I₂
- Mercury(I) is Hg₂²⁺ (diatomic ion), so it’s Hg₂I₂.
- Mercury(I) iodide ✔

#### 18. Sulfur tetrafluoride – SF₄
- Covalent compound: S and F with prefix "tetra" → Sulfur tetrafluoride ✔

#### 19. Silver nitrate – AgNO₃
- Ag⁺ and NO₃⁻ → Silver nitrate ✔

#### 20. Sodium peroxide – Na₂O₂
- Peroxide ion is O₂²⁻ → two Na⁺ → Sodium peroxide ✔

#### 21. Chromium(III) permanganate – Cr(MnO₄)₃
- Cr³⁺ and MnO₄⁻ → three MnO₄⁻ needed → Chromium(III) permanganate ✔

#### 22. Magnesium hydroxide – Mg(OH)₂
- Mg²⁺ and OH⁻ → two OH⁻ → Magnesium hydroxide ✔

#### 23. Tin(IV) oxide – SnO₂
- Sn⁴⁺ and O²⁻ → SnO₂ → Tin(IV) oxide ✔

#### 24. Phosphorus pentachloride – PCl₅
- Covalent: "penta" = 5 Cl → Phosphorus pentachloride ✔

#### 25. Dinitrogen tetrafluoride – N₂F₄
- Covalent: "di" = 2 N, "tetra" = 4 F → Dinitrogen tetrafluoride ✔

#### 26. Sodium thiosulfate – Na₂S₂O₃
- S₂O₃²⁻ is thiosulfate → Sodium thiosulfate ✔

#### 27. Cadmium chromate – CdCrO₄
- Cd²⁺ and CrO₄²⁻ → Cadmium chromate ✔

#### 28. Lithium hydride – LiH
- Li⁺ and H⁻ → Lithium hydride ✔

#### 29. Aluminum nitride – AlN
- Al³⁺ and N³⁻ → Aluminum nitride ✔

#### 30. Antimony(III) phosphate – SbPO₄
- Sb³⁺ and PO₄³⁻ → one-to-one → Antimony(III) phosphate ✔

#### 31. Lead(II) nitrate – Pb(NO₃)₂
- Pb²⁺ and NO₃⁻ → two nitrates → Lead(II) nitrate ✔

#### 32. Ammonium oxalate – (NH₄)₂C₂O₄
- NH₄⁺ and C₂O₄²⁻ → two ammonium ions → Ammonium oxalate ✔

#### 33. Cobalt(II) hypobromite – Co(BrO)₂
- Co²⁺ and BrO⁻ → two BrO⁻ → Cobalt(II) hypobromite ✔

#### 34. Manganese(IV) phosphide – Mn₃P₄
- Mn⁴⁺ and P³⁻ → need lowest common multiple: 3 Mn⁴⁺ (total +12), 4 P³⁻ (total -12) → Manganese(IV) phosphide ✔

#### 35. Platinum(II) cyanide – Pt(CN)₂
- Pt²⁺ and CN⁻ → two CN⁻ → Platinum(II) cyanide ✔

#### 36. Bismuth(III) chloride – BiCl₃
- Bi³⁺ and Cl⁻ → Bismuth(III) chloride ✔

#### 37. Strontium bromide – SrBr₂
- Sr²⁺ and Br⁻ → Strontium bromide ✔

#### 38. Rubidium arsenate – Rb₃AsO₄
- Rb⁺ and AsO₄³⁻ → three Rb⁺ → Rubidium arsenate ✔

#### 39. Barium iodide hexahydrate – BaI₂·6H₂O
- Hydrate: six water molecules → Barium iodide hexahydrate ✔

#### 40. Copper(II) sulfate monohydrate – CuSO₄·H₂O
- One water molecule → Copper(II) sulfate monohydrate ✔

#### 41. Iron(II) phosphate octahydrate – Fe₃(PO₄)₂·8H₂O
- Fe²⁺ and PO₄³⁻ → need 3 Fe²⁺ (+6) and 2 PO₄³⁻ (-6) → Fe₃(PO₄)₂
- Octahydrate = 8 H₂O → Iron(II) phosphate octahydrate ✔

#### 42. Strontium hydrogensulfate trihydrate – Sr(HSO₄)₂·3H₂O
- Sr²⁺ and HSO₄⁻ → two HSO₄⁻ needed
- Trihydrate = 3 H₂O → Strontium hydrogensulfate trihydrate ✔

#### 43. Manganese(II) sulfate heptahydrate – MnSO₄·7H₂O
- Mn²⁺ and SO₄²⁻ → MnSO₄
- Heptahydrate = 7 H₂O → Manganese(II) sulfate heptahydrate ✔

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✔ Final Answer Summary:

All entries are already correctly named or have the correct formula provided. The worksheet appears to be already complete with correct names and formulas.

But if you're asking to fill in the blanks as per the original worksheet format, here’s how it should look:

| Compound Name / Formula | Correct Name / Formula |
|-------------------------|------------------------|
| Barium iodide – BaI₂ | Barium iodide |
| Aluminium oxide – Al₂O₃ | Aluminum oxide |
| Iron(II) sulfide – FeS | Iron(II) sulfide |
| Lead(II) iodide – PbI₂ | Lead(II) iodide |
| Arsenic trichloride – AsCl₃ | Arsenic trichloride |
| Sodium hydrogenphosphate – Na₂HPO₄ | Sodium hydrogenphosphate |
| Zinc hydrogencarbonate – Zn(HCO₃)₂ | Zinc hydrogencarbonate |
| Ammonium hydroxide – NH₄OH | Ammonium hydroxide |
| Copper(II) bromate – Cu(BrO₃)₂ | Copper(II) bromate |
| Lithium hypochlorite – LiClO | Lithium hypochlorite |
| Cesium acetate – CsCH₃COO | Cesium acetate |
| Iron(II) oxalate – FeC₂O₄ | Iron(II) oxalate |
| Sodium sulfite – Na₂SO₃ | Sodium sulfite |
| Calcium carbonate – CaCO₃ | Calcium carbonate |
| Nickel(II) dichromate – NiCr₂O₇ | Nickel(II) dichromate |
| Potassium bicarbonate – KHCO₃ | Potassium bicarbonate |
| Mercury(I) iodide – Hg₂I₂ | Mercury(I) iodide |
| Sulfur tetrafluoride – SF₄ | Sulfur tetrafluoride |
| Silver nitrate – AgNO₃ | Silver nitrate |
| Sodium peroxide – Na₂O₂ | Sodium peroxide |
| Chromium(III) permanganate – Cr(MnO₄)₃ | Chromium(III) permanganate |
| Magnesium hydroxide – Mg(OH)₂ | Magnesium hydroxide |
| Tin(IV) oxide – SnO₂ | Tin(IV) oxide |
| Phosphorus pentachloride – PCl₅ | Phosphorus pentachloride |
| Dinitrogen tetrafluoride – N₂F₄ | Dinitrogen tetrafluoride |
| Sodium thiosulfate – Na₂S₂O₃ | Sodium thiosulfate |
| Cadmium chromate – CdCrO₄ | Cadmium chromate |
| Lithium hydride – LiH | Lithium hydride |
| Aluminum nitride – AlN | Aluminum nitride |
| Antimony(III) phosphate – SbPO₄ | Antimony(III) phosphate |
| Lead(II) nitrate – Pb(NO₃)₂ | Lead(II) nitrate |
| Ammonium oxalate – (NH₄)₂C₂O₄ | Ammonium oxalate |
| Cobalt(II) hypobromite – Co(BrO)₂ | Cobalt(II) hypobromite |
| Manganese(IV) phosphide – Mn₃P₄ | Manganese(IV) phosphide |
| Platinum(II) cyanide – Pt(CN)₂ | Platinum(II) cyanide |
| Bismuth(III) chloride – BiCl₃ | Bismuth(III) chloride |
| Strontium bromide – SrBr₂ | Strontium bromide |
| Rubidium arsenate – Rb₃AsO₄ | Rubidium arsenate |
| Barium iodide hexahydrate – BaI₂·6H₂O | Barium iodide hexahydrate |
| Copper(II) sulfate monohydrate – CuSO₄·H₂O | Copper(II) sulfate monohydrate |
| Iron(II) phosphate octahydrate – Fe₃(PO₄)₂·8H₂O | Iron(II) phosphate octahydrate |
| Strontium hydrogensulfate trihydrate – Sr(HSO₄)₂·3H₂O | Strontium hydrogensulfate trihydrate |
| Manganese(II) sulfate heptahydrate – MnSO₄·7H₂O | Manganese(II) sulfate heptahydrate |

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✔ Conclusion:

The worksheet is correctly completed. All names and formulas match standard chemical nomenclature rules.

If your task was to verify or fill in the blanks, then all answers are correct as written.

Let me know if you'd like an explanation of any specific rule (e.g., hydrates, transition metals, polyatomic ions).