Pre AP Chemistry worksheet focusing on naming ionic compounds and writing their formulas, including examples like Na₃P, MgBr₂, and silver iodide.

Let's solve this step-by-step. This worksheet is about naming ionic compounds and writing formulas for ionic compounds, with special attention to Roman numerals (which indicate the charge of transition metals or metals that can have multiple charges).

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Part 1: Name the following ionic compounds

We'll go through each compound, identify the ions, determine charges, and name accordingly.

| Compound | Name |
|--------|------|
| Na₃P | Sodium phosphide *(Na⁺, P³⁻)* |
| Ag₂Se | Silver selenide *(Ag⁺, Se²⁻)* |
| Ca₃P₂ | Calcium phosphide *(Ca²⁺, P³⁻)* |
| Li₂O | Lithium oxide *(Li⁺, O²⁻)* |
| K₂S | Potassium sulfide *(K⁺, S²⁻)* |
| (NH₄)₂S | Ammonium sulfide *(NH₄⁺, S²⁻)* |
| Li₂CO₃ | Lithium carbonate *(Li⁺, CO₃²⁻)* |
| KCN | Potassium cyanide *(K⁺, CN⁻)* |
| Sb(NO₃)₅ | Antimony(V) nitrate *(Sb⁵⁺, NO₃⁻)* → Roman numeral needed because Sb has variable charge |
| Cu(NO₃)₂ | Copper(II) nitrate *(Cu²⁺, NO₃⁻)* → Cu has two common charges (I and II), so we need Roman numeral |
| Au(CN)₃ | Gold(III) cyanide *(Au³⁺, CN⁻)* → Au has variable charge |

| Compound | Name |
|--------|------|
| MgBr₂ | Magnesium bromide *(Mg²⁺, Br⁻)* |
| AlCl₃ | Aluminum chloride *(Al³⁺, Cl⁻)* |
| Ba₃N₂ | Barium nitride *(Ba²⁺, N³⁻)* |
| ZnF₂ | Zinc fluoride *(Zn²⁺, F⁻)* |
| SrI₂ | Strontium iodide *(Sr²⁺, I⁻)* |
| Ca₃(PO₄)₂ | Calcium phosphate *(Ca²⁺, PO₄³⁻)* |
| Al(C₂H₃O₂)₃ | Aluminum acetate *(Al³⁺, C₂H₃O₂⁻)* |
| AgNO₃ | Silver nitrate *(Ag⁺, NO₃⁻)* |
| NiS | Nickel(II) sulfide *(Ni²⁺, S²⁻)* → Ni has variable charge, so use Roman numeral |
| FeCl₂ | Iron(II) chloride *(Fe²⁺, Cl⁻)* → Fe has +2 and +3, so use Roman numeral |
| Pb(SO₄)₂ | Lead(IV) sulfate *(Pb⁴⁺, SO₄²⁻)* → Pb has variable charge; since it's Pb(SO₄)₂, Pb must be +4 |

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Part 2: Write the correct formulas for each ionic compound

Now, write formulas based on ion charges.

| Compound | Formula |
|--------|--------|
| silver iodide | AgI *(Ag⁺, I⁻)* |
| magnesium nitride | Mg₃N₂ *(Mg²⁺, N³⁻)* → LCM = 6 → Mg₃N₂ |
| zinc chloride | ZnCl₂ *(Zn²⁺, Cl⁻)* |
| aluminum fluoride | AlF₃ *(Al³⁺, F⁻)* |
| potassium permanganate | KMnO₄ *(K⁺, MnO₄⁻)* |
| cesium bromate | CsBrO₃ *(Cs⁺, BrO₃⁻)* |
| aluminum hypoiodite | Al(IO)₃ *(Al³⁺, IO⁻)* → Hypoiodite is IO⁻ |
| tin (IV) chlorate | Sn(ClO₃)₄ *(Sn⁴⁺, ClO₃⁻)* → Tin(IV) means +4 |
| copper (I) sulfide | Cu₂S *(Cu⁺, S²⁻)* → Two Cu⁺ needed to balance S²⁻ |
| lithium sulfide | Li₂S *(Li⁺, S²⁻)* |
| cadmium bromide | CdBr₂ *(Cd²⁺, Br⁻)* |
| barium phosphide | Ba₃P₂ *(Ba²⁺, P³⁻)* → LCM = 6 → Ba₃P₂ |
| strontium oxide | SrO *(Sr²⁺, O²⁻)* |
| strontium sulfate | SrSO₄ *(Sr²⁺, SO₄²⁻)* |
| magnesium cyanide | Mg(CN)₂ *(Mg²⁺, CN⁻)* |
| cadmium periodate | Cd(IO₄)₂ *(Cd²⁺, IO₄⁻)* |
| bismuth (III) carbonate | Bi₂(CO₃)₃ *(Bi³⁺, CO₃²⁻)* → LCM = 6 → Bi₂(CO₃)₃ |
| iron (III) oxide | Fe₂O₃ *(Fe³⁺, O²⁻)* → LCM = 6 → Fe₂O₃ |

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✔ Final Answer Table

#### Part 1: Naming Ionic Compounds

| Formula | Name |
|--------|------|
| Na₃P | Sodium phosphide |
| Ag₂Se | Silver selenide |
| Ca₃P₂ | Calcium phosphide |
| Li₂O | Lithium oxide |
| K₂S | Potassium sulfide |
| (NH₄)₂S | Ammonium sulfide |
| Li₂CO₃ | Lithium carbonate |
| KCN | Potassium cyanide |
| Sb(NO₃)₅ | Antimony(V) nitrate |
| Cu(NO₃)₂ | Copper(II) nitrate |
| Au(CN)₃ | Gold(III) cyanide |
| MgBr₂ | Magnesium bromide |
| AlCl₃ | Aluminum chloride |
| Ba₃N₂ | Barium nitride |
| ZnF₂ | Zinc fluoride |
| SrI₂ | Strontium iodide |
| Ca₃(PO₄)₂ | Calcium phosphate |
| Al(C₂H₃O₂)₃ | Aluminum acetate |
| AgNO₃ | Silver nitrate |
| NiS | Nickel(II) sulfide |
| FeCl₂ | Iron(II) chloride |
| Pb(SO₄)₂ | Lead(IV) sulfate |

#### Part 2: Writing Formulas

| Name | Formula |
|------|---------|
| silver iodide | AgI |
| magnesium nitride | Mg₃N₂ |
| zinc chloride | ZnCl₂ |
| aluminum fluoride | AlF₃ |
| potassium permanganate | KMnO₄ |
| cesium bromate | CsBrO₃ |
| aluminum hypoiodite | Al(IO)₃ |
| tin (IV) chlorate | Sn(ClO₃)₄ |
| copper (I) sulfide | Cu₂S |
| lithium sulfide | Li₂S |
| cadmium bromide | CdBr₂ |
| barium phosphide | Ba₃P₂ |
| strontium oxide | SrO |
| strontium sulfate | SrSO₄ |
| magnesium cyanide | Mg(CN)₂ |
| cadmium periodate | Cd(IO₄)₂ |
| bismuth (III) carbonate | Bi₂(CO₃)₃ |
| iron (III) oxide | Fe₂O₃ |

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🔍 Key Concepts Used:

- Monatomic ions: Use element names with suffix "-ide" for anions.
- Polyatomic ions: Memorize common ones (e.g., NO₃⁻ = nitrate, SO₄²⁻ = sulfate, CN⁻ = cyanide).
- Transition metals: Always use Roman numerals to indicate charge when applicable (e.g., Fe²⁺ = iron(II), Fe³⁺ = iron(III)).
- Charge balancing: Total positive charge = total negative charge.
- Parentheses: Used around polyatomic ions when more than one is present (e.g., Al(NO₃)₃).

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✔ All answers are now complete and accurate.
Make sure to fill in your name and check that at least 90% is completed for credit.