Printable chemistry worksheet for practicing naming and writing formulas of ionic compounds.

This worksheet involves naming ionic compounds and writing their chemical formulas. Below is a detailed explanation of how to approach this task, followed by the solutions for the first few examples.

Key Concepts for Naming Ionic Compounds

1. Metal + Nonmetal:
- The metal is named first, followed by the nonmetal.
- Nonmetals change their ending to "-ide" (e.g., chlorine → chloride).

2. Polyatomic Ions:
- Polyatomic ions are groups of atoms that behave as a single unit with a charge (e.g., NO₃⁻, SO₄²⁻).
- Common polyatomic ions include: nitrate (NO₃⁻), sulfate (SO₄²⁻), hydroxide (OH⁻), etc.

3. Roman Numerals:
- Transition metals can have multiple oxidation states. Roman numerals indicate the charge on the metal ion (e.g., Iron(III) = Fe³⁺).

4. Ammonium Ion:
- Ammonium is a cation with the formula NH₄⁺.

5. Acids and Hydroxides:
- Acids contain hydrogen and a nonmetal or polyatomic ion (e.g., HCl, H₂SO₄).
- Hydroxides contain a metal and hydroxide (OH⁻).

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Steps to Solve

1. Identify the Cations and Anions:
- Determine the positively charged ions (cations) and negatively charged ions (anions).

2. Balance Charges:
- Ensure the total positive charge equals the total negative charge in the compound.

3. Apply Naming Rules:
- Use the appropriate naming conventions based on the type of compound.

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Solutions for the First Few Examples

#### 1. Sodium Nitrate
- Cation: Sodium (Na⁺)
- Anion: Nitrate (NO₃⁻)
- Formula: NaNO₃
- Name: Sodium nitrate

#### 2. Calcium Carbonate
- Cation: Calcium (Ca²⁺)
- Anion: Carbonate (CO₃²⁻)
- Formula: CaCO₃
- Name: Calcium carbonate

#### 3. Magnesium Oxide
- Cation: Magnesium (Mg²⁺)
- Anion: Oxide (O²⁻)
- Formula: MgO
- Name: Magnesium oxide

#### 4. Ammonium Sulfide
- Cation: Ammonium (NH₄⁺)
- Anion: Sulfide (S²⁻)
- Formula: (NH₄)₂S
- Name: Ammonium sulfide

#### 5. Lead(II) Sulfate
- Cation: Lead(II) (Pb²⁺)
- Anion: Sulfate (SO₄²⁻)
- Formula: PbSO₄
- Name: Lead(II) sulfate

#### 6. Sodium Cyanide
- Cation: Sodium (Na⁺)
- Anion: Cyanide (CN⁻)
- Formula: NaCN
- Name: Sodium cyanide

#### 7. Potassium Hydroxide
- Cation: Potassium (K⁺)
- Anion: Hydroxide (OH⁻)
- Formula: KOH
- Name: Potassium hydroxide

#### 8. Silver Chloride
- Cation: Silver (Ag⁺)
- Anion: Chloride (Cl⁻)
- Formula: AgCl
- Name: Silver chloride

#### 9. Iron(III) Hydroxide
- Cation: Iron(III) (Fe³⁺)
- Anion: Hydroxide (OH⁻)
- Formula: Fe(OH)₃
- Name: Iron(III) hydroxide

#### 10. Potassium Hydroxide
- Cation: Potassium (K⁺)
- Anion: Hydroxide (OH⁻)
- Formula: KOH
- Name: Potassium hydroxide

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Writing Formulas from Names

#### 26. Aluminum Chloride
- Cation: Aluminum (Al³⁺)
- Anion: Chloride (Cl⁻)
- Formula: AlCl₃

#### 27. Iron(III) Hydroxide
- Cation: Iron(III) (Fe³⁺)
- Anion: Hydroxide (OH⁻)
- Formula: Fe(OH)₃

#### 28. Sodium Acetate
- Cation: Sodium (Na⁺)
- Anion: Acetate (CH₃COO⁻)
- Formula: CH₃COONa

#### 29. Calcium Hydroxide
- Cation: Calcium (Ca²⁺)
- Anion: Hydroxide (OH⁻)
- Formula: Ca(OH)₂

#### 30. Sodium Iodate
- Cation: Sodium (Na⁺)
- Anion: Iodate (IO₃⁻)
- Formula: NaIO₃

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Final Answers for the First Few Questions

| Number | Name/Formula | Formula/Name |
|--------|-----------------------|----------------------|
| 1 | Sodium nitrate | NaNO₃ |
| 2 | Calcium carbonate | CaCO₃ |
| 3 | Magnesium oxide | MgO |
| 4 | Ammonium sulfide | (NH₄)₂S |
| 5 | Lead(II) sulfate | PbSO₄ |
| 6 | Sodium cyanide | NaCN |
| 7 | Potassium hydroxide | KOH |
| 8 | Silver chloride | AgCl |
| 9 | Iron(III) hydroxide | Fe(OH)₃ |
| 10 | Potassium hydroxide | KOH |
| 26 | Aluminum chloride | AlCl₃ |
| 27 | Iron(III) hydroxide | Fe(OH)₃ |
| 28 | Sodium acetate | CH₃COONa |
| 29 | Calcium hydroxide | Ca(OH)₂ |
| 30 | Sodium iodate | NaIO₃ |

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General Tips

- Always balance charges when writing formulas.
- Memorize common polyatomic ions and their charges.
- Pay attention to Roman numerals for transition metals.

If you need solutions for more questions, let me know!