Identify the type of chemical reaction for each equation on this worksheet.
Types of Chemical Reactions Worksheet with ten chemical equations to identify as synthesis, decomposition, single replacement, double replacement, or combustion.
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Step-by-step solution for: Types of Chemical Equations Worksheet worksheet
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Show Answer Key & Explanations
Step-by-step solution for: Types of Chemical Equations Worksheet worksheet
Here is the solution to the “Types of Chemical Reactions Worksheet”, with each reaction identified and explained.
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1. 2KClO₃ → 2KCl + 3O₂
✔ Type: Decomposition
Explanation: One compound (potassium chlorate, KClO₃) breaks down into two or more simpler substances (KCl and O₂). This is a classic decomposition reaction, often seen in the thermal decomposition of metal chlorates.
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2. N₂ + 3H₂ → 2NH₃
✔ Type: Synthesis (or Combination)
Explanation: Two elements (nitrogen and hydrogen) combine to form a single compound (ammonia, NH₃). This fits the definition of a synthesis reaction: A + B → AB.
*(Note: Problem #4 is identical to #2 — likely a typo in the worksheet.)*
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3. CH₄ + 2O₂ → CO₂ + 2H₂O
✔ Type: Combustion
Explanation: A hydrocarbon (methane, CH₄) reacts with oxygen (O₂) to produce carbon dioxide and water. This is the standard form of a combustion reaction for organic compounds: fuel + O₂ → CO₂ + H₂O.
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4. N₂ + 3H₂ → 2NH₃
✔ Type: Synthesis (or Combination)
Explanation: Same as #2 — nitrogen and hydrogen combine to form ammonia. This is the Haber process, a key industrial synthesis reaction.
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5. 2Al(OH)₃ + 3H₂SO₄ → Al₂(SO₄)₃ + 6H₂O
✔ Type: Double Replacement (or Double Displacement)
Explanation: The positive ions (Al³⁺ and H⁺) and negative ions (OH⁻ and SO₄²⁻) switch partners. Aluminum hydroxide and sulfuric acid react to form aluminum sulfate and water. Water is a product, which often indicates an acid-base neutralization — a subtype of double replacement.
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6. 2HgO → 2Hg + O₂
✔ Type: Decomposition
Explanation: Mercury(II) oxide breaks down into its elements: mercury metal and oxygen gas. Another classic decomposition reaction, historically used to discover oxygen.
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7. Zn + 2HCl → ZnCl₂ + H₂
✔ Type: Single Replacement (or Single Displacement)
Explanation: Zinc (Zn), a more reactive metal, replaces hydrogen in HCl to form zinc chloride and hydrogen gas. General form: A + BC → AC + B.
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8. Fe₂(SO₄)₃ + 6KOH → 3K₂SO₄ + 2Fe(OH)₃
✔ Type: Double Replacement (or Double Displacement)
Explanation: Iron(III) sulfate and potassium hydroxide exchange ions to form potassium sulfate and iron(III) hydroxide. The formation of a precipitate (Fe(OH)₃ is insoluble) confirms this is a double replacement reaction.
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9. C₇H₁₆ + 11O₂ → 7CO₂ + 8H₂O
✔ Type: Combustion
Explanation: Heptane (C₇H₁₆), a hydrocarbon, burns in oxygen to produce carbon dioxide and water — textbook combustion reaction.
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10. 2Na + 2H₂O → 2NaOH + H₂
✔ Type: Single Replacement (or Single Displacement)
Explanation: Sodium metal replaces hydrogen in water to form sodium hydroxide and hydrogen gas. Very reactive metals like Na, K, Ca can displace H from water. Form: A + BC → AC + B.
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## ✔ Final Answer Summary:
1. Decomposition
2. Synthesis
3. Combustion
4. Synthesis
5. Double Replacement
6. Decomposition
7. Single Replacement
8. Double Replacement
9. Combustion
10. Single Replacement
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📌 *Note: Reactions #2 and #4 are identical — both are synthesis reactions. This appears to be a duplication error in the worksheet.*
Let me know if you’d like a printable version or further explanations!
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1. 2KClO₃ → 2KCl + 3O₂
✔ Type: Decomposition
Explanation: One compound (potassium chlorate, KClO₃) breaks down into two or more simpler substances (KCl and O₂). This is a classic decomposition reaction, often seen in the thermal decomposition of metal chlorates.
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2. N₂ + 3H₂ → 2NH₃
✔ Type: Synthesis (or Combination)
Explanation: Two elements (nitrogen and hydrogen) combine to form a single compound (ammonia, NH₃). This fits the definition of a synthesis reaction: A + B → AB.
*(Note: Problem #4 is identical to #2 — likely a typo in the worksheet.)*
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3. CH₄ + 2O₂ → CO₂ + 2H₂O
✔ Type: Combustion
Explanation: A hydrocarbon (methane, CH₄) reacts with oxygen (O₂) to produce carbon dioxide and water. This is the standard form of a combustion reaction for organic compounds: fuel + O₂ → CO₂ + H₂O.
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4. N₂ + 3H₂ → 2NH₃
✔ Type: Synthesis (or Combination)
Explanation: Same as #2 — nitrogen and hydrogen combine to form ammonia. This is the Haber process, a key industrial synthesis reaction.
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5. 2Al(OH)₃ + 3H₂SO₄ → Al₂(SO₄)₃ + 6H₂O
✔ Type: Double Replacement (or Double Displacement)
Explanation: The positive ions (Al³⁺ and H⁺) and negative ions (OH⁻ and SO₄²⁻) switch partners. Aluminum hydroxide and sulfuric acid react to form aluminum sulfate and water. Water is a product, which often indicates an acid-base neutralization — a subtype of double replacement.
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6. 2HgO → 2Hg + O₂
✔ Type: Decomposition
Explanation: Mercury(II) oxide breaks down into its elements: mercury metal and oxygen gas. Another classic decomposition reaction, historically used to discover oxygen.
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7. Zn + 2HCl → ZnCl₂ + H₂
✔ Type: Single Replacement (or Single Displacement)
Explanation: Zinc (Zn), a more reactive metal, replaces hydrogen in HCl to form zinc chloride and hydrogen gas. General form: A + BC → AC + B.
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8. Fe₂(SO₄)₃ + 6KOH → 3K₂SO₄ + 2Fe(OH)₃
✔ Type: Double Replacement (or Double Displacement)
Explanation: Iron(III) sulfate and potassium hydroxide exchange ions to form potassium sulfate and iron(III) hydroxide. The formation of a precipitate (Fe(OH)₃ is insoluble) confirms this is a double replacement reaction.
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9. C₇H₁₆ + 11O₂ → 7CO₂ + 8H₂O
✔ Type: Combustion
Explanation: Heptane (C₇H₁₆), a hydrocarbon, burns in oxygen to produce carbon dioxide and water — textbook combustion reaction.
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10. 2Na + 2H₂O → 2NaOH + H₂
✔ Type: Single Replacement (or Single Displacement)
Explanation: Sodium metal replaces hydrogen in water to form sodium hydroxide and hydrogen gas. Very reactive metals like Na, K, Ca can displace H from water. Form: A + BC → AC + B.
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## ✔ Final Answer Summary:
1. Decomposition
2. Synthesis
3. Combustion
4. Synthesis
5. Double Replacement
6. Decomposition
7. Single Replacement
8. Double Replacement
9. Combustion
10. Single Replacement
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📌 *Note: Reactions #2 and #4 are identical — both are synthesis reactions. This appears to be a duplication error in the worksheet.*
Let me know if you’d like a printable version or further explanations!
Parent Tip: Review the logic above to help your child master the concept of types of chemical reactions worksheet.
