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

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 needed.

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🔹 Key Rules for Naming Ionic Compounds:

1. Cations (positive ions):
- Metals with fixed charges: use element name (e.g., Na⁺ → sodium).
- Metals with variable charges: use Roman numerals in parentheses to indicate charge (e.g., Fe²⁺ → iron(II)).
2. Anions (negative ions):
- Monatomic anions: change ending to "-ide" (e.g., Cl⁻ → chloride).
- Polyatomic ions: use known names (e.g., SO₄²⁻ → sulfate).
3. Polyatomic Ions: Memorize common ones like:
- NO₃⁻ = nitrate
- CO₃²⁻ = carbonate
- PO₄³⁻ = phosphate
- OH⁻ = hydroxide
- CN⁻ = cyanide
- NH₄⁺ = ammonium
- C₂H₃O₂⁻ or CH₃COO⁻ = acetate

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✔ Left Column: Give Names for Formulas

| Formula | Name |
|--------|------|
| 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 | Beryllium sulfate |
| 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 | Cobalt(II) nitride |
| 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 |

> Explanation:
- For transition metals like Fe, Cr, Ti, Co, Pb: check oxidation state from anion.
- Example: In FeCl₂, Cl⁻ is -1, so two Cl⁻ = -2 ⇒ Fe must be +2 → Iron(II)
- In FeCl₃: three Cl⁻ = -3 ⇒ Fe = +3 → Iron(III)
- For polyatomic ions: NO₂⁻ is nitrite, not nitrate (NO₃⁻)
- Acetate is CH₃COO⁻ or C₂H₃O₂⁻ — both are acceptable.

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✔ Right Column: Write Formulas from Names

| Name | Formula |
|------|---------|
| 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 |
| 30) Iron(III) oxide | Fe₂O₃ |
| 31) Gallium nitride | GaN |
| 32) Iron(II) bromide | FeBr₂ |
| 33) Vanadium(V) phosphate | V₃(PO₄)₅ |
| 34) Calcium oxide | CaO |
| 35) Magnesium acetate | Mg(CH₃COO)₂ or Mg(C₂H₃O₂)₂ |
| 36) Aluminum sulfate | Al₂(SO₄)₃ |
| 37) Copper(I) carbonate | Cu₂CO₃ |
| 38) Barium oxide | BaO |
| 39) Ammonium sulfite | (NH₄)₂SO₃ |
| 40) Silver bromide | AgBr |

> Explanation:
- Phosphide = P³⁻ → Na⁺ needs 3 to balance → Na₃P
- Nitrate = NO₃⁻ → Mg²⁺ requires two → Mg(NO₃)₂
- Sulfite = SO₃²⁻ → Pb²⁺ → PbSO₃
- Phosphate = PO₄³⁻ → Ca²⁺ → need 3 Ca²⁺ and 2 PO₄³⁻ → Ca₃(PO₄)₂
- Ammonium = NH₄⁺ → SO₄²⁻ → (NH₄)₂SO₄
- Silver is always +1 → AgCN
- Aluminum is +3, sulfur is -2 → Al₂S₃ (LCM of 3 and 2 is 6)
- Copper(I) = Cu⁺, arsenide = As³⁻ → need 3 Cu⁺ and 1 As³⁻ → Cu₃As
- Iron(III) = Fe³⁺, oxide = O²⁻ → Fe₂O₃ (2×3 = 6+, 3×2 = 6−)
- Vanadium(V) = V⁵⁺, phosphate = PO₄³⁻ → LCM of 5 and 3 is 15 → V₃(PO₄)₅
- Magnesium acetate: Mg²⁺, CH₃COO⁻ → Mg(CH₃COO)₂
- Aluminum sulfate: Al³⁺, SO₄²⁻ → Al₂(SO₄)₃
- Copper(I) = Cu⁺, carbonate = CO₃²⁻ → Cu₂CO₃
- Barium oxide: Ba²⁺, O²⁻ → BaO
- Ammonium sulfite: NH₄⁺, SO₃²⁻ → (NH₄)₂SO₃
- Silver bromide: Ag⁺, Br⁻ → AgBr

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✔ Final Answer Sheet:

#### Left Side – Names

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

#### Right Side – Formulas

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 or Mg(C₂H₃O₂)₂
36) Al₂(SO₄)₃
37) Cu₂CO₃
38) BaO
39) (NH₄)₂SO₃
40) AgBr

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✔ All answers are now complete and explained using standard ionic compound naming rules. Let me know if you'd like a printable version or flashcards!