Balancing Chemical Reactions Practice worksheet with solutions for identifying reaction types.

The image you've uploaded is a "Balancing Chemical Reactions – Practice" worksheet. It contains 8 chemical reactions that have already been balanced, and the types of reactions are identified in red. Below is a detailed explanation of each reaction, including how it was balanced and why it belongs to the stated type of reaction.

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🔬 1) N₂ + H₂ → NH₃

Balanced Equation:
1 N₂ + 3 H₂ → 2 NH₃

- Balancing Explanation:
Nitrogen (N₂) has 2 nitrogen atoms, and ammonia (NH₃) has 1 nitrogen per molecule. So we need 2 NH₃ to balance nitrogen. That gives us 6 hydrogen atoms on the right. To get 6 hydrogens on the left, we use 3 H₂ molecules.

- Type of Reaction: Synthesis
Two or more substances combine to form a single product. Here, nitrogen and hydrogen combine to form ammonia.

✔ Correct

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🔬 2) MgF₂ + Li₂CO₃ → MgCO₃ + LiF

Balanced Equation:
1 MgF₂ + 1 Li₂CO₃ → 1 MgCO₃ + 2 LiF

- Balancing Explanation:
Mg and CO₃ are already balanced with one each. But on the right, LiF has only one Li, but Li₂CO₃ has two Li atoms. So we need 2 LiF on the right. That means 2 F atoms on the right — so we need 1 MgF₂ on the left (which provides 2 F). All atoms now balance.

- Type of Reaction: Double Replacement
Ions exchange partners: Mg²⁺ pairs with CO₃²⁻, and Li⁺ pairs with F⁻.

✔ Correct

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🔬 3) P₄ + O₂ → P₂O₃

Balanced Equation:
1 P₄ + 3 O₂ → 2 P₂O₃

- Balancing Explanation:
P₄ has 4 P atoms. Each P₂O₃ has 2 P atoms, so 2 P₂O₃ gives 4 P atoms. On the right, 2 P₂O₃ has 6 O atoms. So we need 3 O₂ (6 oxygen atoms).

- Type of Reaction: Synthesis
Phosphorus and oxygen combine to form phosphorus trioxide.

✔ Correct

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🔬 4) RbNO₃ + BeF₂ → Be(NO₃)₂ + RbF

Balanced Equation:
2 RbNO₃ + 1 BeF₂ → 1 Be(NO₃)₂ + 2 RbF

- Balancing Explanation:
Be(NO₃)₂ needs 2 NO₃⁻ ions, so we need 2 RbNO₃ on the left. That gives 2 Rb⁺ ions, which require 2 RbF on the right. Be and F are balanced.

- Type of Reaction: Double Replacement
Rb⁺ and Be²⁺ swap anions: NO₃⁻ and F⁻.

✔ Correct

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🔬 5) AgNO₃ + Cu → Cu(NO₃)₂ + Ag

Balanced Equation:
2 AgNO₃ + 1 Cu → 1 Cu(NO₃)₂ + 2 Ag

- Balancing Explanation:
Cu(NO₃)₂ has 2 NO₃⁻ groups, so we need 2 AgNO₃. That gives 2 Ag atoms on the left, so 2 Ag on the right. Copper is balanced.

- Type of Reaction: Single Replacement
Copper replaces silver in silver nitrate because copper is more reactive than silver.

✔ Correct

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🔬 6) H₂O₂ → H₂O + O₂

Balanced Equation:
2 H₂O₂ → 2 H₂O + 1 O₂

- Balancing Explanation:
Left: 2 H₂O₂ = 4 H, 4 O
Right: 2 H₂O = 4 H, 2 O; O₂ = 2 O → total 4 O
So atoms balance.

- Type of Reaction: Decomposition
One compound breaks down into simpler substances.

✔ Correct

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🔬 7) HCN + CuSO₄ → H₂SO₄ + Cu(CN)₂

Balanced Equation:
2 HCN + 1 CuSO₄ → 1 H₂SO₄ + 1 Cu(CN)₂

- Balancing Explanation:
Cu(CN)₂ requires 2 CN⁻ ions → so 2 HCN needed. That gives 2 H⁺, forming H₂SO₄. SO₄²⁻ comes from CuSO₄. Cu and S are balanced.

- Type of Reaction: Double Replacement
H⁺ and Cu²⁺ exchange anions: CN⁻ and SO₄²⁻.

✔ Correct

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🔬 8) GaF₃ + Cs → CsF + Ga

Balanced Equation:
1 GaF₃ + 3 Cs → 3 CsF + 1 Ga

- Balancing Explanation:
GaF₃ has 3 F⁻ ions → need 3 CsF on the right. That requires 3 Cs atoms on the left. Ga and F are balanced.

- Type of Reaction: Single Replacement
Cesium (Cs) replaces gallium (Ga) in GaF₃ because Cs is more reactive (alkali metal).

✔ Correct

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✔ Final Summary:

All the equations are correctly balanced, and the types of reactions are accurately identified as follows:

| # | Reaction Type |
|---|--------------------------|
| 1 | Synthesis |
| 2 | Double Replacement |
| 3 | Synthesis |
| 4 | Double Replacement |
| 5 | Single Replacement |
| 6 | Decomposition |
| 7 | Double Replacement |
| 8 | Single Replacement |

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🟢 Conclusion: The worksheet has been completed correctly. Every equation is balanced, and each reaction type is properly classified. Great job! 🎉