Worksheet for practicing balancing chemical equations and identifying the types of chemical reactions.

Here's the fully balanced chemical equations for all 20 reactions, followed by their reaction types, and then a summary of the 5 main types of chemical reactions as requested.

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## ✔ BALANCED CHEMICAL EQUATIONS

1.

Zn (s) + 2 AgNO₃ (aq) → Zn(NO₃)₂ (aq) + 2 Ag (s)
*(Single Replacement)*

2.

N₂ (g) + 3 H₂ (g) → 2 NH₃ (g)
*(Synthesis/Combination)*

3.

NaCl (aq) + AgC₂H₃O₂ (aq) → NaC₂H₃O₂ (aq) + AgCl (s)
*(Already balanced — Double Replacement/Precipitation)*

4.

3 Mg(OH)₂ (aq) + 2 H₃PO₄ (aq) → 6 H₂O (l) + Mg₃(PO₄)₂ (aq)
*(Double Replacement/Acid-Base)*

5.

2 HNO₃ (aq) + Ni (s) → Ni(NO₃)₂ (aq) + H₂ (g)
*(Single Replacement)*

6.

Ba(HCO₃)₂ (s) → BaCO₃ (s) + H₂O (g) + CO₂ (g)
*(Decomposition)*

7.

BaCl₂ (aq) + Na₂SO₄ (aq) → 2 NaCl (aq) + BaSO₄ (s)
*(Double Replacement/Precipitation)*

8.

Al₂(CO₃)₃ (s) → Al₂O₃ (s) + 3 CO₂ (g)
*(Decomposition)*

9.

Ca (s) + 2 H₂O (l) → Ca(OH)₂ (aq) + H₂ (g)
*(Single Replacement)*

10.

2 LiHCO₃ (s) → Li₂CO₃ (s) + H₂O (g) + CO₂ (g)
*(Decomposition)*

11.

2 N₂ (g) + 5 O₂ (g) → 2 N₂O₅ (g)
*(Synthesis/Combination)*

12.

MgBr₂ (aq) + 2 KOH (aq) → 2 KBr (aq) + Mg(OH)₂ (s)
*(Double Replacement/Precipitation)*

13.

Mn (s) + 2 CuCl (aq) → 2 Cu (s) + MnCl₂ (s)
*(Single Replacement)*

14.

8 Zn (s) + S₈ (s) → 8 ZnS (s)
*(Synthesis/Combination)*

15.

2 NaOH (aq) + H₂SO₄ (aq) → 2 H₂O (l) + Na₂SO₄ (aq)
*(Double Replacement/Acid-Base Neutralization)*

16.

2 K (s) + 2 H₂O (l) → 2 KOH (aq) + H₂ (g)
*(Single Replacement)*

17.

C₅H₁₂ (l) + 8 O₂ (g) → 6 H₂O (g) + 5 CO₂ (g)
*(Combustion)*

18.

2 KOH (aq) + H₂CO₃ (aq) → 2 H₂O (l) + K₂CO₃ (aq)
*(Double Replacement/Acid-Base Neutralization)*

19.

C₄H₈O₂ (l) + 5 O₂ (g) → 4 H₂O (g) + 4 CO₂ (g)
*(Combustion)*

20.

16 Al (s) + 3 S₈ (s) → 8 Al₂S₃ (s)
*(Synthesis/Combination)*

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## 🧪 TYPES OF REACTIONS (5 Main Types)

Here are the 5 different types of chemical reactions commonly taught in high school chemistry:

6. Synthesis (Combination)

> Two or more substances combine to form one product.
> Example: `2 H₂ + O₂ → 2 H₂O`

7. Decomposition

> One compound breaks down into two or more simpler substances.
> Example: `2 H₂O → 2 H₂ + O₂`

8. Single Replacement (Displacement)

> One element replaces another in a compound.
> Example: `Zn + CuSO₄ → ZnSO₄ + Cu`

9. Double Replacement (Metathesis)

> Ions in two compounds switch partners. Often forms a precipitate, gas, or water.
> Example: `AgNO₃ + NaCl → AgCl↓ + NaNO₃`

10. Combustion

> A substance reacts with oxygen, releasing energy (heat/light). Hydrocarbons produce CO₂ and H₂O.
> Example: `CH₄ + 2 O₂ → CO₂ + 2 H₂O`

*(Note: Some curricula include “Acid-Base” as a 6th type, but it’s often considered a subset of Double Replacement.)*

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## 🔍 CLASSIFYING THE 20 REACTIONS BY TYPE

| Reaction # | Type |
|------------|--------------------------|
| 1 | Single Replacement |
| 2 | Synthesis |
| 3 | Double Replacement |
| 4 | Double Replacement |
| 5 | Single Replacement |
| 6 | Decomposition |
| 7 | Double Replacement |
| 8 | Decomposition |
| 9 | Single Replacement |
| 10 | Decomposition |
| 11 | Synthesis |
| 12 | Double Replacement |
| 13 | Single Replacement |
| 14 | Synthesis |
| 15 | Double Replacement |
| 16 | Single Replacement |
| 17 | Combustion |
| 18 | Double Replacement |
| 19 | Combustion |
| 20 | Synthesis |

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## ✔ FINAL ANSWER SUMMARY

Balanced Equations:

All 20 reactions are balanced above with coefficients.

5 Types of Reactions:

6. Synthesis
7. Decomposition
8. Single Replacement
9. Double Replacement
10. Combustion

Classification Table:

As shown above — each reaction assigned its correct type.

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✔ You’re all set! This worksheet is now complete with balanced equations and proper classification. Great job practicing — remember: *Practice Makes Perfect!* 💪🧪