Here's the solution to identifying the 5 types of chemical reactions for each equation, with explanations:
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1. 2 Na + Cl₂ → 2 NaCl
✔ Synthesis (Given as example)
*Explanation:* Two elements (Na and Cl₂) combine to form one compound (NaCl). Pattern: A + B → AB.
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2. Pb + FeSO₄ → PbSO₄ + Fe
✔ Single Replacement
*Explanation:* Lead (Pb) replaces iron (Fe) in iron sulfate (FeSO₄), forming lead sulfate and free iron. Pattern: A + BC → AC + B.
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3. P₄ + 3 O₂ → 2 P₂O₃
✔ Synthesis
*Explanation:* Phosphorus and oxygen combine to form a single compound (diphosphorus trioxide). Pattern: A + B → AB.
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4. 2 NO₂ → 2 O₂ + N₂
✔ Decomposition
*Explanation:* One compound (NO₂) breaks down into two simpler substances (O₂ and N₂). Pattern: AB → A + B.
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5. Na₃PO₄ + 3 KOH → 3 NaOH + K₃PO₄
✔ Double Replacement
*Explanation:* The cations (Na⁺ and K⁺) switch partners between anions (PO₄³⁻ and OH⁻). Pattern: AB + CD → AD + CB.
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6. C₃H₆O + 4 O₂ → 3 CO₂ + 3 H₂O
✔ Combustion
*Explanation:* A compound (likely acetone or similar organic molecule) reacts with oxygen to produce carbon dioxide and water — classic combustion. Pattern: Fuel + O₂ → CO₂ + H₂O.
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7. MgCl₂ + Li₂CO₃ → MgCO₃ + 2 LiCl
✔ Double Replacement
*Explanation:* Magnesium and lithium switch anions (Cl⁻ and CO₃²⁻). Pattern: AB + CD → AD + CB.
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8. C₆H₁₂ + 9 O₂ → 6 CO₂ + 6 H₂O
✔ Combustion
*Explanation:* Hydrocarbon (cyclohexane or similar) burns in oxygen to produce CO₂ and H₂O. Classic combustion reaction.
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9. CaCO₃ → CaO + CO₂
✔ Decomposition
*Explanation:* Calcium carbonate breaks down into calcium oxide and carbon dioxide (often upon heating). Pattern: AB → A + B.
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10. 2 AgNO₃ + Cu → Cu(NO₃)₂ + 2 Ag
✔ Single Replacement
*Explanation:* Copper (Cu) replaces silver (Ag) in silver nitrate, forming copper(II) nitrate and elemental silver. Pattern: A + BC → AC + B.
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11. 2 H₂ + O₂ → 2 H₂O
✔ Synthesis
*Explanation:* Hydrogen and oxygen combine to form water. Pattern: A + B → AB.
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✔ Final Answer Summary:
| Reaction # | Type |
|------------|------------------------|
| 1 | Synthesis |
| 2 | Single Replacement |
| 3 | Synthesis |
| 4 | Decomposition |
| 5 | Double Replacement |
| 6 | Combustion |
| 7 | Double Replacement |
| 8 | Combustion |
| 9 | Decomposition |
| 10 | Single Replacement |
| 11 | Synthesis |
Let me know if you’d like the patterns written out for each!
Parent Tip: Review the logic above to help your child master the concept of identifying types of reactions worksheet.
