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For each reaction, determine whether it is an example of combustion or not.

C+02 -> + CO2 Choose...
CO2 + 4H2 -> CH4 + 2 H2O Choose...
2N2O5—> 4NO2 + O2 Choose...
2 NO + 02 —> 2 NO2 Choose...
2 C2H6 + 702 —> 4CO2 + 6H2O Choose...

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Answer:

2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O

General Formulas and Concepts:

Chemistry - Reactions

  • Synthesis Reactions: A + B → AB
  • Decomposition Reactions: AB → A + B
  • Single-Replacement Reactions: A + BC → AB + C
  • Double-Replacement Reactions: AB + CD → AD + BC
  • Combustion Reactions: CₓHₙ + O₂ → CO₂ + H₂O

Explanation:

Step 1: Define

RxN A:   C + O₂ → CO₂

RxN B:   CO₂ + 4H₂ → CH₄ + 2H₂O

RxN C:   2N₂O₅ → 4NO₂ + O₂

RxN D:   2NO + O₂ → 2NO₂

RxN E:   2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O

Step 2: Identify

RxN A:   Synthesis Reaction

RxN B:   Half of an Equilibrium equation for Combustion

RxN C:   Decomposition Reaction

RxN D:   Synthesis Reaction

RxN E:   Combustion Reaction

Only reaction that is a combustion reaction is RxN E. Every other RxN is not a combustion reaction.

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