Chemistry worksheet for writing chemical formulas with answer keys.

The image contains three sections related to writing chemical formulas. Below, I will explain the solution for each section and provide a detailed breakdown.

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Section 1: Writing Chemical Formulas (Part A)

#### Task:
- Determine the chemical formula for each cation and anion combination.
- The anions are: Chloride (Cl⁻), Bromide (Br⁻), Oxide (O²⁻), Fluoride (F⁻).
- The cations are: Potassium (K⁺), Sodium (Na⁺), Magnesium (Mg²⁺), Calcium (Ca²⁺), Aluminum (Al³⁺), Copper (Cu²⁺), Zinc (Zn²⁺), Lead (Pb²⁺).

#### Solution:
To determine the chemical formula, we need to balance the charges of the cations and anions. Here's how it works:

1. Potassium (K⁺):
- K⁺ + Cl⁻ → KCl
- K⁺ + Br⁻ → KBr
- K⁺ + O²⁻ → K₂O (2 K⁺ ions needed to balance 1 O²⁻)
- K⁺ + F⁻ → KF

2. Sodium (Na⁺):
- Na⁺ + Cl⁻ → NaCl
- Na⁺ + Br⁻ → NaBr
- Na⁺ + O²⁻ → Na₂O (2 Na⁺ ions needed to balance 1 O²⁻)
- Na⁺ + F⁻ → NaF

3. Magnesium (Mg²⁺):
- Mg²⁺ + Cl⁻ → MgCl₂ (2 Cl⁻ ions needed to balance 1 Mg²⁺)
- Mg²⁺ + Br⁻ → MgBr₂
- Mg²⁺ + O²⁻ → MgO
- Mg²⁺ + F⁻ → MgF₂

4. Calcium (Ca²⁺):
- Ca²⁺ + Cl⁻ → CaCl₂
- Ca²⁺ + Br⁻ → CaBr₂
- Ca²⁺ + O²⁻ → CaO
- Ca²⁺ + F⁻ → CaF₂

5. Aluminum (Al³⁺):
- Al³⁺ + Cl⁻ → AlCl₃ (3 Cl⁻ ions needed to balance 1 Al³⁺)
- Al³⁺ + Br⁻ → AlBr₃
- Al³⁺ + O²⁻ → Al₂O₃ (2 Al³⁺ ions needed to balance 3 O²⁻)
- Al³⁺ + F⁻ → AlF₃

6. Copper (Cu²⁺):
- Cu²⁺ + Cl⁻ → CuCl₂
- Cu²⁺ + Br⁻ → CuBr₂
- Cu²⁺ + O²⁻ → CuO
- Cu²⁺ + F⁻ → CuF₂

7. Zinc (Zn²⁺):
- Zn²⁺ + Cl⁻ → ZnCl₂
- Zn²⁺ + Br⁻ → ZnBr₂
- Zn²⁺ + O²⁻ → ZnO
- Zn²⁺ + F⁻ → ZnF₂

8. Lead (Pb²⁺):
- Pb²⁺ + Cl⁻ → PbCl₂
- Pb²⁺ + Br⁻ → PbBr₂
- Pb²⁺ + O²⁻ → PbO
- Pb²⁺ + F⁻ → PbF₂

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Section 2: Writing Chemical Formulas (Part B)

#### Task:
- Determine the chemical formula for each cation and anion combination.
- The anions are: Hydroxide (OH⁻), Nitrate (NO₃⁻), Sulfate (SO₄²⁻), Carbonate (CO₃²⁻).
- The cations are: Potassium (K⁺), Sodium (Na⁺), Magnesium (Mg²⁺), Calcium (Ca²⁺), Aluminum (Al³⁺), Copper (Cu²⁺), Zinc (Zn²⁺), Lead (Pb²⁺), Iron (Fe²⁺), Iron (Fe³⁺), Silver (Ag⁺).

#### Solution:
Again, we balance the charges of the cations and anions.

1. Potassium (K⁺):
- K⁺ + OH⁻ → KOH
- K⁺ + NO₃⁻ → KNO₃
- K⁺ + SO₄²⁻ → K₂SO₄ (2 K⁺ ions needed to balance 1 SO₄²⁻)
- K⁺ + CO₃²⁻ → K₂CO₃

2. Sodium (Na⁺):
- Na⁺ + OH⁻ → NaOH
- Na⁺ + NO₃⁻ → NaNO₃
- Na⁺ + SO₄²⁻ → Na₂SO₄
- Na⁺ + CO₃²⁻ → Na₂CO₃

3. Magnesium (Mg²⁺):
- Mg²⁺ + OH⁻ → Mg(OH)₂ (2 OH⁻ ions needed to balance 1 Mg²⁺)
- Mg²⁺ + NO₃⁻ → Mg(NO₃)₂
- Mg²⁺ + SO₄²⁻ → MgSO₄
- Mg²⁺ + CO₃²⁻ → MgCO₃

4. Calcium (Ca²⁺):
- Ca²⁺ + OH⁻ → Ca(OH)₂
- Ca²⁺ + NO₃⁻ → Ca(NO₃)₂
- Ca²⁺ + SO₄²⁻ → CaSO₄
- Ca²⁺ + CO₃²⁻ → CaCO₃

5. Aluminum (Al³⁺):
- Al³⁺ + OH⁻ → Al(OH)₃ (3 OH⁻ ions needed to balance 1 Al³⁺)
- Al³⁺ + NO₃⁻ → Al(NO₃)₃
- Al³⁺ + SO₄²⁻ → Al₂(SO₄)₃ (2 Al³⁺ ions needed to balance 3 SO₄²⁻)
- Al³⁺ + CO₃²⁻ → Al₂(CO₃)₃

6. Copper (Cu²⁺):
- Cu²⁺ + OH⁻ → Cu(OH)₂
- Cu²⁺ + NO₃⁻ → Cu(NO₃)₂
- Cu²⁺ + SO₄²⁻ → CuSO₄
- Cu²⁺ + CO₃²⁻ → CuCO₃

7. Zinc (Zn²⁺):
- Zn²⁺ + OH⁻ → Zn(OH)₂
- Zn²⁺ + NO₃⁻ → Zn(NO₃)₂
- Zn²⁺ + SO₄²⁻ → ZnSO₄
- Zn²⁺ + CO₃²⁻ → ZnCO₃

8. Lead (Pb²⁺):
- Pb²⁺ + OH⁻ → Pb(OH)₂
- Pb²⁺ + NO₃⁻ → Pb(NO₃)₂
- Pb²⁺ + SO₄²⁻ → PbSO₄
- Pb²⁺ + CO₃²⁻ → PbCO₃

9. Iron (Fe²⁺):
- Fe²⁺ + OH⁻ → Fe(OH)₂
- Fe²⁺ + NO₃⁻ → Fe(NO₃)₂
- Fe²⁺ + SO₄²⁻ → FeSO₄
- Fe²⁺ + CO₃²⁻ → FeCO₃

10. Iron (Fe³⁺):
- Fe³⁺ + OH⁻ → Fe(OH)₃
- Fe³⁺ + NO₃⁻ → Fe(NO₃)₃
- Fe³⁺ + SO₄²⁻ → Fe₂(SO₄)₃ (2 Fe³⁺ ions needed to balance 3 SO₄²⁻)
- Fe³⁺ + CO₃²⁻ → Fe₂(CO₃)₃

11. Silver (Ag⁺):
- Ag⁺ + OH⁻ → AgOH
- Ag⁺ + NO₃⁻ → AgNO₃
- Ag⁺ + SO₄²⁻ → Ag₂SO₄ (2 Ag⁺ ions needed to balance 1 SO₄²⁻)
- Ag⁺ + CO₃²⁻ → Ag₂CO₃

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Section 3: Quick Test - Writing Chemical Formulas

#### Task:
- Write the chemical formulas for the given compounds.

#### Compounds:
1. Iron(III) hydroxide
2. Sodium chloride
3. Potassium carbonate
4. Lead(II) iodide
5. Aluminum sulfate
6. Zinc nitrate
7. Copper(II) bromide
8. Potassium hydroxide
9. Calcium oxide
10. Magnesium sulfide
11. Silver chloride
12. Ammonium carbonate
13. Iron(III) sulfate
14. Lead(II) nitrate
15. Magnesium fluoride
16. Sodium hydrogen carbonate
17. Iron(III) phosphate
18. Iron(III) carbonate
19. Calcium nitrate
20. Zinc phosphate

#### Solution:
1. Iron(III) hydroxide → Fe(OH)₃
2. Sodium chloride → NaCl
3. Potassium carbonate → K₂CO₃
4. Lead(II) iodide → PbI₂
5. Aluminum sulfate → Al₂(SO₄)₃
6. Zinc nitrate → Zn(NO₃)₂
7. Copper(II) bromide → CuBr₂
8. Potassium hydroxide → KOH
9. Calcium oxide → CaO
10. Magnesium sulfide → MgS
11. Silver chloride → AgCl
12. Ammonium carbonate → (NH₄)₂CO₃
13. Iron(III) sulfate → Fe₂(SO₄)₃
14. Lead(II) nitrate → Pb(NO₃)₂
15. Magnesium fluoride → MgF₂
16. Sodium hydrogen carbonate → NaHCO₃
17. Iron(III) phosphate → FePO₄
18. Iron(III) carbonate → Fe₂(CO₃)₃
19. Calcium nitrate → Ca(NO₃)₂
20. Zinc phosphate → Zn₃(PO₄)₂

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Final Answer:

\boxed{
\begin{array}{l}
\text{Section 1:} \\
\text{KCl, KBr, K₂O, KF, NaCl, NaBr, Na₂O, NaF, MgCl₂, MgBr₂, MgO, MgF₂, CaCl₂, CaBr₂, CaO, CaF₂, AlCl₃, AlBr₃, Al₂O₃, AlF₃, CuCl₂, CuBr₂, CuO, CuF₂, ZnCl₂, ZnBr₂, ZnO, ZnF₂, PbCl₂, PbBr₂, PbO, PbF₂} \\
\text{Section 2:} \\
\text{KOH, KNO₃, K₂SO₄, K₂CO₃, NaOH, NaNO₃, Na₂SO₄, Na₂CO₃, Mg(OH)₂, Mg(NO₃)₂, MgSO₄, MgCO₃, Ca(OH)₂, Ca(NO₃)₂, CaSO₄, CaCO₃, Al(OH)₃, Al(NO₃)₃, Al₂(SO₄)₃, Al₂(CO₃)₃, Cu(OH)₂, Cu(NO₃)₂, CuSO₄, CuCO₃, Zn(OH)₂, Zn(NO₃)₂, ZnSO₄, ZnCO₃, Pb(OH)₂, Pb(NO₃)₂, PbSO₄, PbCO₃, Fe(OH)₂, Fe(NO₃)₂, FeSO₄, FeCO₃, Fe(OH)₃, Fe(NO₃)₃, Fe₂(SO₄)₃, Fe₂(CO₃)₃, AgOH, AgNO₃, Ag₂SO₄, Ag₂CO₃} \\
\text{Section 3:} \\
\text{Fe(OH)₃, NaCl, K₂CO₃, PbI₂, Al₂(SO₄)₃, Zn(NO₃)₂, CuBr₂, KOH, CaO, MgS, AgCl, (NH₄)₂CO₃, Fe₂(SO₄)₃, Pb(NO₃)₂, MgF₂, NaHCO₃, FePO₄, Fe₂(CO₃)₃, Ca(NO₃)₂, Zn₃(PO₄)₂}
\end{array}
}