Naming and writing formulas for ionic compounds worksheet | Live ... - Free Printable

Here is the complete solution for the worksheet “Names & Formulas for Ionic Compounds.” I’ve filled in both the Name (for formulas given on the left) and the Formula (for names given on the right), following standard ionic compound naming rules, including Roman numerals for transition metals with variable charges and proper polyatomic ion usage.

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✔ Left Column: Give the NAME of the compound from its formula

1. Na₂CO₃ → Sodium carbonate
2. NaOH → Sodium hydroxide
3. MgBr₂ → Magnesium bromide
4. KCl → Potassium chloride
5. FeCl₂ → Iron(II) chloride
6. FeCl₃ → Iron(III) chloride
7. Zn(OH)₂ → Zinc hydroxide
8. Be₂SO₄ → *Incorrect formula — should be BeSO₄* → Beryllium sulfate *(assuming typo; Be²⁺ and SO₄²⁻ give BeSO₄)*
9. CrF₂ → Chromium(II) fluoride
10. Al₂S₃ → Aluminum sulfide
11. PbO → Lead(II) oxide
12. Li₃PO₄ → Lithium phosphate
13. TiI₄ → Titanium(IV) iodide
14. Co₃N₂ → *Incorrect formula — should be Co₃N₂? Actually, cobalt(II) nitride would be Co₃N₂, but it’s rare. More likely intended as Co₃N₂ for Cobalt(II) nitride.* → Cobalt(II) nitride *(Note: This compound is not common; typically cobalt forms CoN or other stoichiometries, but based on charge balance: Co²⁺ and N³⁻ → Co₃N₂ is correct)*
15. Mg₃P₂ → Magnesium phosphide
16. Ga(NO₂)₃ → Gallium nitrite
17. Ag₂SO₃ → Silver sulfite
18. NH₄OH → Ammonium hydroxide
19. Al(CN)₃ → Aluminum cyanide
20. Be(CH₃COO)₂ → Beryllium acetate

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✔ Right Column: Give the FORMULA of the compound from its name

21. sodium phosphide → Na₃P
22. magnesium nitrate → Mg(NO₃)₂
23. lead (II) sulfite → PbSO₃
24. calcium phosphate → Ca₃(PO₄)₂
25. ammonium sulfate → (NH₄)₂SO₄
26. silver cyanide → AgCN
27. aluminum sulfide → Al₂S₃
28. beryllium chloride → BeCl₂
29. copper (I) arsenide → Cu₃As *(Cu⁺ and As³⁻ → 3:1 ratio)*
30. iron (III) oxide → Fe₂O₃
31. gallium nitride → GaN
32. iron (II) bromide → FeBr₂
33. vanadium (V) phosphate → V₃(PO₄)₅ *(V⁵⁺ and PO₄³⁻ → LCM of 3 and 5 is 15 → 3 V and 5 PO₄)*
34. calcium oxide → CaO
35. magnesium acetate → Mg(CH₃COO)₂
36. aluminum sulfate → Al₂(SO₄)₃
37. copper (I) carbonate → Cu₂CO₃ *(Cu⁺ and CO₃²⁻ → 2:1 ratio)*
38. barium oxide → BaO
39. ammonium sulfite → (NH₄)₂SO₃
40. silver bromide → AgBr

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## 🧠 Key Rules Used:

- Cations: Metals (including ammonium NH₄⁺). Transition metals often need Roman numerals to indicate charge.
- Anions: Nonmetals or polyatomic ions (e.g., CO₃²⁻, OH⁻, NO₃⁻, SO₄²⁻, etc.).
- Charge Balance: Total positive charge = total negative charge.
- Polyatomic Ions: Memorized (e.g., phosphate = PO₄³⁻, sulfate = SO₄²⁻, nitrate = NO₃⁻, etc.).
- Acetate: CH₃COO⁻ (often written as C₂H₃O₂⁻).
- Roman Numerals: Required for transition metals that have multiple possible charges (e.g., Fe²⁺/Fe³⁺, Cr²⁺/Cr³⁺, Cu⁺/Cu²⁺, etc.).

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## ⚠️ Notes on Potential Errors:

- #8 Be₂SO₄: This is chemically incorrect. Beryllium is +2, sulfate is -2 → correct formula is BeSO₄. Likely a typo in the worksheet.
- #14 Co₃N₂: Cobalt(II) nitride — while unusual, the formula balances: 3×(+2) = +6, 2×(-3) = -6. It's acceptable for this exercise.
- #29 Copper(I) arsenide: Arsenide is As³⁻, so 3 Cu⁺ needed → Cu₃As.
- #33 Vanadium(V) phosphate: V⁵⁺ and PO₄³⁻ → requires 3 V and 5 PO₄ → V₃(PO₄)₅.

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✔ Final Answer Sheet (Formatted for Submission):

```
Names & Formulas for Ionic Compounds

Give the name or formula of the following ionic compounds:

Name Formula
1) Sodium carbonate 21) Na₃P
2) Sodium hydroxide 22) Mg(NO₃)₂
3) Magnesium bromide 23) PbSO₃
4) Potassium chloride 24) Ca₃(PO₄)₂
5) Iron(II) chloride 25) (NH₄)₂SO₄
6) Iron(III) chloride 26) AgCN
7) Zinc hydroxide 27) Al₂S₃
8) Beryllium sulfate 28) BeCl₂
9) Chromium(II) fluoride 29) Cu₃As
10) Aluminum sulfide 30) Fe₂O₃
11) Lead(II) oxide 31) GaN
12) Lithium phosphate 32) FeBr₂
13) Titanium(IV) iodide 33) V₃(PO₄)₅
14) Cobalt(II) nitride 34) CaO
15) Magnesium phosphide 35) Mg(CH₃COO)₂
16) Gallium nitrite 36) Al₂(SO₄)₃
17) Silver sulfite 37) Cu₂CO₃
18) Ammonium hydroxide 38) BaO
19) Aluminum cyanide 39) (NH₄)₂SO₃
20) Beryllium acetate 40) AgBr
```

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