Based on the reactions provided, here’s the classification of each reaction type:
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Zn + 2HCl ⟶ ZnCl₂ + H₂ - This is a Single-Replacement reaction because zinc (Zn) replaces the hydrogen (H) in hydrochloric acid (HCl).
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CH₄ + 2O₂ ⟶ CO₂ + 2H₂O + Heat - This is a Combustion reaction as it involves the burning of methane (CH₄) in oxygen (O₂), resulting in carbon dioxide (CO₂) and water (H₂O), and producing heat.
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2H₂O₂ ⟶ 2H₂O + O₂ - This is a Decomposition reaction as hydrogen peroxide (H₂O₂) breaks down into water (H₂O) and oxygen (O₂).
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Na₂S + CaCl₂ ⟶ CaS + 2NaCl - This is a Double-Replacement reaction because the ions in sodium sulfide (Na₂S) and calcium chloride (CaCl₂) switch partners to form calcium sulfide (CaS) and sodium chloride (NaCl).
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N₂ + 3H₂ ⟶ 2NH₃ - This is a Synthesis reaction since nitrogen gas (N₂) and hydrogen gas (H₂) combine to form ammonia (NH₃).
Here's a summary of the types of reactions:
- Single-Replacement
- Combustion
- Decomposition
- Double-Replacement
- Synthesis