Naming Chemical Compounds Worksheet for practicing nomenclature of ionic compounds.

Problem: Naming Chemical Compounds Worksheet

The task involves naming ionic compounds and writing their formulas based on their names. Below is the solution with explanations for each part.

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#### Part 1: Naming Ionic Compounds

Rules for Naming Ionic Compounds:
1. The first element in the formula is named as its element name (e.g., sodium, calcium).
2. The second element is named by changing its ending to "-ide" (e.g., bromide, oxide).
3. If the compound contains a metal that can form multiple ions (e.g., iron), Roman numerals are used to specify the charge.
4. For polyatomic ions, use their specific names (e.g., hydroxide, nitrate).

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##### Solutions:

1. NaBr
- Sodium (Na) + Bromide (Br)
- Name: Sodium bromide

2. CaO
- Calcium (Ca) + Oxide (O)
- Name: Calcium oxide

3. Li₂S
- Lithium (Li) + Sulfide (S)
- Name: Lithium sulfide

4. MgBr₂
- Magnesium (Mg) + Bromide (Br)
- Name: Magnesium bromide

5. Be(OH)₂
- Beryllium (Be) + Hydroxide (OH)
- Name: Beryllium hydroxide

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#### Part 2: Writing Formulas for Ionic Compounds

Rules for Writing Formulas:
1. Identify the charges of the ions involved.
2. Balance the total positive charge with the total negative charge to achieve electrical neutrality.
3. Use subscripts to indicate the number of atoms or ions needed to balance the charges.
4. For polyatomic ions, treat them as a single unit with their overall charge.

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##### Solutions:

6. Potassium iodide
- Potassium (K⁺) + Iodide (I⁻)
- Charges balance as 1+ and 1–.
- Formula: KI

7. Magnesium oxide
- Magnesium (Mg²⁺) + Oxide (O²⁻)
- Charges balance as 2+ and 2–.
- Formula: MgO

8. Aluminum chloride
- Aluminum (Al³⁺) + Chloride (Cl⁻)
- To balance charges: 1 × Al³⁺ = 3+, and 3 × Cl⁻ = 3–.
- Formula: AlCl₃

9. Sodium nitrate
- Sodium (Na⁺) + Nitrate (NO₃⁻)
- Charges balance as 1+ and 1–.
- Formula: NaNO₃

10. Calcium carbonate
- Calcium (Ca²⁺) + Carbonate (CO₃²⁻)
- Charges balance as 2+ and 2–.
- Formula: CaCO₃

11. Lithium sulfate
- Lithium (Li⁺) + Sulfate (SO₄²⁻)
- To balance charges: 2 × Li⁺ = 2+, and 1 × SO₄²⁻ = 2–.
- Formula: Li₂SO₄

12. Beryllium phosphate
- Beryllium (Be²⁺) + Phosphate (PO₄³⁻)
- To balance charges: 3 × Be²⁺ = 6+, and 2 × PO₄³⁻ = 6–.
- Formula: Be₃(PO₄)₂

13. Magnesium hydroxide
- Magnesium (Mg²⁺) + Hydroxide (OH⁻)
- To balance charges: 1 × Mg²⁺ = 2+, and 2 × OH⁻ = 2–.
- Formula: Mg(OH)₂

14. Sodium phosphate
- Sodium (Na⁺) + Phosphate (PO₄³⁻)
- To balance charges: 3 × Na⁺ = 3+, and 1 × PO₄³⁻ = 3–.
- Formula: Na₃PO₄

15. Aluminum carbonate
- Aluminum (Al³⁺) + Carbonate (CO₃²⁻)
- To balance charges: 2 × Al³⁺ = 6+, and 3 × CO₃²⁻ = 6–.
- Formula: Al₂(CO₃)₃

16. Calcium chloride
- Calcium (Ca²⁺) + Chloride (Cl⁻)
- To balance charges: 1 × Ca²⁺ = 2+, and 2 × Cl⁻ = 2–.
- Formula: CaCl₂

17. Sodium cyanide
- Sodium (Na⁺) + Cyanide (CN⁻)
- Charges balance as 1+ and 1–.
- Formula: NaCN

18. Aluminum oxide
- Aluminum (Al³⁺) + Oxide (O²⁻)
- To balance charges: 2 × Al³⁺ = 6+, and 3 × O²⁻ = 6–.
- Formula: Al₂O₃

19. Magnesium acetate
- Magnesium (Mg²⁺) + Acetate (CH₃COO⁻)
- To balance charges: 1 × Mg²⁺ = 2+, and 2 × CH₃COO⁻ = 2–.
- Formula: Mg(CH₃COO)₂

20. Ammonium chloride
- Ammonium (NH₄⁺) + Chloride (Cl⁻)
- Charges balance as 1+ and 1–.
- Formula: NH₄Cl

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Final Answers:

1. NaBr: Sodium bromide
2. CaO: Calcium oxide
3. Li₂S: Lithium sulfide
4. MgBr₂: Magnesium bromide
5. Be(OH)₂: Beryllium hydroxide

6. Potassium iodide: KI
7. Magnesium oxide: MgO
8. Aluminum chloride: AlCl₃
9. Sodium nitrate: NaNO₃
10. Calcium carbonate: CaCO₃
11. Lithium sulfate: Li₂SO₄
12. Beryllium phosphate: Be₃(PO₄)₂
13. Magnesium hydroxide: Mg(OH)₂
14. Sodium phosphate: Na₃PO₄
15. Aluminum carbonate: Al₂(CO₃)₃
16. Calcium chloride: CaCl₂
17. Sodium cyanide: NaCN
18. Aluminum oxide: Al₂O₃
19. Magnesium acetate: Mg(CH₃COO)₂
20. Ammonium chloride: NH₄Cl

Boxed Final Answer:
\[
\boxed{
\begin{array}{ll}
1. & \text{Sodium bromide} \\
2. & \text{Calcium oxide} \\
3. & \text{Lithium sulfide} \\
4. & \text{Magnesium bromide} \\
5. & \text{Beryllium hydroxide} \\
6. & \text{KI} \\
7. & \text{MgO} \\
8. & \text{AlCl}_3 \\
9. & \text{NaNO}_3 \\
10. & \text{CaCO}_3 \\
11. & \text{Li}_2\text{SO}_4 \\
12. & \text{Be}_3(\text{PO}_4)_2 \\
13. & \text{Mg(OH)}_2 \\
14. & \text{Na}_3\text{PO}_4 \\
15. & \text{Al}_2(\text{CO}_3)_3 \\
16. & \text{CaCl}_2 \\
17. & \text{NaCN} \\
18. & \text{Al}_2\text{O}_3 \\
19. & \text{Mg}(\text{CH}_3\text{COO})_2 \\
20. & \text{NH}_4\text{Cl} \\
\end{array}
}
\]