Here's the solution to the worksheet, identifying each reaction as one of the five types:
Synthesis,
Decomposition,
Single Replacement,
Double Replacement, or
Combustion.
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✔ Reaction Type Definitions (for reference):
-
Synthesis: Two or more substances combine to form
one product.
Pattern: `A + B → AB`
-
Decomposition: One compound breaks down into
two or more simpler substances.
Pattern: `AB → A + B`
-
Single Replacement: One element replaces another in a compound.
Pattern: `A + BC → AC + B` (element replaces ion)
-
Double Replacement: Ions from two compounds “swap partners.”
Pattern: `AB + CD → AD + CB`
-
Combustion: A hydrocarbon (or organic compound) reacts with oxygen to produce
CO₂ and H₂O.
Pattern: `Fuel + O₂ → CO₂ + H₂O`
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## 🔍
Solutions:
1. `2 Na + Cl₂ → 2 NaCl`
✔ Synthesis — Two elements combine to form one compound.
*(Given as example)*
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2. `Pb + FeSO₄ → PbSO₄ + Fe`
✔ Single Replacement — Lead (Pb) replaces iron (Fe) in FeSO₄.
Pattern: `A + BC → AC + B`
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3. `P₄ + 3 O₂ → 2 P₂O₃`
✔ Synthesis — Phosphorus and oxygen combine to form phosphorus trioxide.
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4. `2 NO₂ → 2 O₂ + N₂`
✔ Decomposition — Nitrogen dioxide breaks down into oxygen and nitrogen gas.
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5. `Na₃PO₄ + 3 KOH → 3 NaOH + K₃PO₄`
✔ Double Replacement — Sodium and potassium ions swap anions (PO₄³⁻ and OH⁻).
Pattern: `AB + CD → AD + CB`
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6. `C₃H₆O + 4 O₂ → 3 CO₂ + 3 H₂O`
✔ Combustion — Organic compound (C₃H₆O) reacts with oxygen to produce CO₂ and H₂O.
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7. `MgCl₂ + Li₂CO₃ → MgCO₃ + 2 LiCl`
✔ Double Replacement — Magnesium and lithium swap anions (Cl⁻ and CO₃²⁻).
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8. `C₆H₁₂ + 9 O₂ → 6 CO₂ + 6 H₂O`
✔ Combustion — Hydrocarbon (cyclohexane or similar) burns in oxygen to form CO₂ and H₂O.
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9. `CaCO₃ → CaO + CO₂`
✔ Decomposition — Calcium carbonate breaks down into calcium oxide and carbon dioxide.
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10. `2 AgNO₃ + Cu → Cu(NO₃)₂ + 2 Ag`
✔ Single Replacement — Copper replaces silver in silver nitrate.
Pattern: `A + BC → AC + B`
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11. `2 H₂ + O₂ → 2 H₂O`
✔ Synthesis — Hydrogen and oxygen combine to form water.
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## 📝 Final Answer Key:
| # | Reaction | Type |
|---|-------------------------------------------|------------------------|
| 1 | 2 Na + Cl₂ → 2 NaCl | Synthesis |
| 2 | Pb + FeSO₄ → PbSO₄ + Fe | Single Replacement |
| 3 | P₄ + 3 O₂ → 2 P₂O₃ | Synthesis |
| 4 | 2 NO₂ → 2 O₂ + N₂ | Decomposition |
| 5 | Na₃PO₄ + 3 KOH → 3 NaOH + K₃PO₄ | Double Replacement |
| 6 | C₃H₆O + 4 O₂ → 3 CO₂ + 3 H₂O | Combustion |
| 7 | MgCl₂ + Li₂CO₃ → MgCO₃ + 2 LiCl | Double Replacement |
| 8 | C₆H₁₂ + 9 O₂ → 6 CO₂ + 6 H₂O | Combustion |
| 9 | CaCO₃ → CaO + CO₂ | Decomposition |
|10 | 2 AgNO₃ + Cu → Cu(NO₃)₂ + 2 Ag | Single Replacement |
|11 | 2 H₂ + O₂ → 2 H₂O | Synthesis |
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✔ All reactions identified correctly based on standard chemical reaction patterns. Let me know if you want explanations for any specific one!
Parent Tip: Review the logic above to help your child master the concept of classifying chemical reaction types worksheet.
