Identify the type of each chemical reaction from the given equations on this educational worksheet.
Worksheet titled "Identifying the 5 Types of Chemical Reactions" with a list of chemical equations to classify as synthesis, decomposition, single replacement, double replacement, or combustion reactions.
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Step-by-step solution for: Identifying The 5 Types Of Chemical Reactions Worksheet
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Step-by-step solution for: Identifying The 5 Types Of Chemical Reactions Worksheet
Here's the completed worksheet with each reaction identified by type, along with a clear explanation for each.
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Identifying the 5 Types of Chemical Reactions
Reactions (identify pattern below)
Name of Reaction Type
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1. 2 Na + Cl₂ → 2 NaCl
✔ Synthesis *(Example given)*
*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), a more reactive metal, replaces iron (Fe) in the compound FeSO₄. Pattern: A + BC → AC + B.
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3. P₄ + 3 O₂ → 2 P₂O₃
✔ Synthesis
*Explanation:* Two elements (phosphorus and oxygen) combine to form one 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 positive ions (Na⁺ and K⁺) switch partners between the two compounds. 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:* Cyclohexane (or similar hydrocarbon) burns in oxygen to produce CO₂ and H₂O — textbook 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), more reactive than silver, replaces Ag⁺ in silver nitrate. 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. (Also a combustion reaction, but since “synthesis” is listed as a primary category and it fits perfectly, synthesis is appropriate here. In some contexts, this is also called a combustion reaction — but for this worksheet’s 5 types, synthesis is correct.)
> 📝 *Note: Some reactions can fit multiple categories. For example, #11 is both synthesis and combustion. But since the worksheet asks you to choose from 5 specific types, and synthesis is the most direct match for "two elements forming one compound," we classify it as synthesis. Combustion is typically reserved for reactions involving organic fuels or hydrocarbons reacting with O₂ to give CO₂ and H₂O — which #11 doesn’t do.*
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| # | 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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Let me know if you’d like a printable version or flashcards for studying these reaction types!
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Identifying the 5 Types of Chemical Reactions
Reactions (identify pattern below)
Name of Reaction Type
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1. 2 Na + Cl₂ → 2 NaCl
✔ Synthesis *(Example given)*
*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), a more reactive metal, replaces iron (Fe) in the compound FeSO₄. Pattern: A + BC → AC + B.
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3. P₄ + 3 O₂ → 2 P₂O₃
✔ Synthesis
*Explanation:* Two elements (phosphorus and oxygen) combine to form one 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 positive ions (Na⁺ and K⁺) switch partners between the two compounds. 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:* Cyclohexane (or similar hydrocarbon) burns in oxygen to produce CO₂ and H₂O — textbook 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), more reactive than silver, replaces Ag⁺ in silver nitrate. 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. (Also a combustion reaction, but since “synthesis” is listed as a primary category and it fits perfectly, synthesis is appropriate here. In some contexts, this is also called a combustion reaction — but for this worksheet’s 5 types, synthesis is correct.)
> 📝 *Note: Some reactions can fit multiple categories. For example, #11 is both synthesis and combustion. But since the worksheet asks you to choose from 5 specific types, and synthesis is the most direct match for "two elements forming one compound," we classify it as synthesis. Combustion is typically reserved for reactions involving organic fuels or hydrocarbons reacting with O₂ to give CO₂ and H₂O — which #11 doesn’t do.*
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✔ Final Answer Summary:
| # | 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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Let me know if you’d like a printable version or flashcards for studying these reaction types!
Parent Tip: Review the logic above to help your child master the concept of types of reactions worksheet.
