Ionic compound naming practice worksheet for chemistry students.

Let's solve this step-by-step. The task is to name the ionic compounds given their formulas (on the left) and to write the correct formula for the named ionic compounds (on the right). We'll go through each one, explaining the rules as we go.

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🔹 Rules for Naming Ionic Compounds:

1. Cation (positive ion) comes first, then anion (negative ion).
2. For metals with variable charges (like Fe, Cu, Pb), use Roman numerals in parentheses to indicate charge.
3. Anions end in -ide (e.g., chloride, oxide).
4. Polyatomic ions have specific names (e.g., sulfate, nitrate, hydroxide).
5. When writing formulas, balance charges so that total positive = total negative.

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## ✔ Left Side: Name the Formula

1) Na₂CO₃
→ Sodium + carbonate → Sodium carbonate

2) NaOH
→ Sodium + hydroxide → Sodium hydroxide

3) MgBr₂
→ Magnesium + bromide → Magnesium bromide

4) KCl
→ Potassium + chloride → Potassium chloride

5) FeCl₂
→ Iron has two possible charges. Cl⁻ is -1, so two Cl⁻ = -2 → Fe must be +2 → Iron(II) chloride

6) FeCl₃
→ Three Cl⁻ = -3 → Fe = +3 → Iron(III) chloride

7) Zn(OH)₂
→ Zinc + hydroxide → Zn²⁺, OH⁻ → Zinc hydroxide (Zn always +2)

8) Be₂SO₄
→ Beryllium + sulfate → Be²⁺, SO₄²⁻ → Beryllium sulfate

9) CrF₂
→ Chromium + fluoride → F⁻ = -1, two F = -2 → Cr = +2 → Chromium(II) fluoride

10) Al₂S₃
→ Aluminum + sulfide → Al³⁺, S²⁻ → Aluminum sulfide

11) PbO
→ Lead + oxide → O²⁻, so Pb = +2 → Lead(II) oxide

12) Li₃PO₄
→ Lithium + phosphate → Lithium phosphate

13) TiI₄
→ Titanium + iodide → I⁻ = -1, four I = -4 → Ti = +4 → Titanium(IV) iodide

14) Co₃N₂
→ Cobalt + nitride → N³⁻, so three Co must balance two N³⁻ → total negative = -6 → each Co = +2 → Cobalt(II) nitride

15) Mg₃P₂
→ Magnesium + phosphide → Mg²⁺, P³⁻ → Magnesium phosphide

16) Ga(NO₂)₃
→ Gallium + nitrite → NO₂⁻ is nitrite → Ga³⁺ → Gallium nitrite

17) Ag₂SO₃
→ Silver + sulfite → Ag⁺, SO₃²⁻ → need two Ag⁺ to balance → Silver sulfite

18) NH₄OH
→ Ammonium + hydroxide → Ammonium hydroxide

19) Al(CN)₃
→ Aluminum + cyanide → CN⁻ → Aluminum cyanide

20) Be(CH₃COO)₂
→ Beryllium + acetate → CH₃COO⁻ = acetate → Beryllium acetate

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## ✔ Right Side: Write the Formula from the Name

21) Sodium phosphide
→ Na⁺ + P³⁻ → Need 3 Na⁺ to balance one P³⁻ → Na₃P

22) Magnesium nitrate
→ Mg²⁺ + NO₃⁻ → Need two NO₃⁻ → Mg(NO₃)₂

23) Lead(II) sulfite
→ Pb²⁺ + SO₃²⁻ → Charges balance directly → PbSO₃

24) Calcium phosphate
→ Ca²⁺ + PO₄³⁻ → LCM of 2 and 3 is 6 → 3 Ca²⁺ = +6, 2 PO₄³⁻ = -6 → Ca₃(PO₄)₂

25) Ammonium sulfate
→ NH₄⁺ + SO₄²⁻ → Need two NH₄⁺ → (NH₄)₂SO₄

26) Silver cyanide
→ Ag⁺ + CN⁻ → AgCN

27) Aluminum sulfide
→ Al³⁺ + S²⁻ → LCM of 3 and 2 is 6 → 2 Al³⁺ = +6, 3 S²⁻ = -6 → Al₂S₃

28) Beryllium chloride
→ Be²⁺ + Cl⁻ → Need two Cl⁻ → BeCl₂

29) Copper(I) arsenide
→ Cu⁺ + As³⁻ → Need 3 Cu⁺ and 1 As³⁻ → Cu₃As

30) Iron(III) oxide
→ Fe³⁺ + O²⁻ → LCM of 3 and 2 is 6 → 2 Fe³⁺ = +6, 3 O²⁻ = -6 → Fe₂O₃

31) Gallium nitride
→ Ga³⁺ + N³⁻ → Charges balance → GaN

32) Iron(II) bromide
→ Fe²⁺ + Br⁻ → Need two Br⁻ → FeBr₂

33) Vanadium(V) phosphate
→ V⁵⁺ + PO₄³⁻ → Find LCM of 5 and 3 = 15 → 3 V⁵⁺ = +15, 5 PO₄³⁻ = -15 → V₃(PO₄)₅

34) Calcium oxide
→ Ca²⁺ + O²⁻ → CaO

35) Magnesium acetate
→ Mg²⁺ + CH₃COO⁻ → Need two acetate → Mg(CH₃COO)₂

36) Aluminum sulfate
→ Al³⁺ + SO₄²⁻ → LCM of 3 and 2 = 6 → 2 Al³⁺ = +6, 3 SO₄²⁻ = -6 → Al₂(SO₄)₃

37) Copper(I) carbonate
→ Cu⁺ + CO₃²⁻ → Need 2 Cu⁺ and 1 CO₃²⁻ → Cu₂CO₃

38) Barium oxide
→ Ba²⁺ + O²⁻ → BaO

39) Ammonium sulfite
→ NH₄⁺ + SO₃²⁻ → Need two NH₄⁺ → (NH₄)₂SO₃

40) Silver bromide
→ Ag⁺ + Br⁻ → AgBr

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## ✔ Final Answer Key:

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

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✔ All answers are now complete and correctly formatted.

Let me know if you'd like this as a printable PDF or want explanations for any specific compound!