Question

Which reaction is a combustion?

A.Fe + S8 → FeS
B.H2O → H2 + O2
C.Zn + HCl → ZnCl2 + H2
D.NaCl + AgNO3 → NaNO3 + AgCl
E.HBr + NaOH → NaBr + H2O
F.C10H8 + 12 O2 → 10 CO2 + 4 H2O

Answer 1

F. C₁₀H₈ + 12 O₂ → 10 CO₂ + 4 H₂O

Explanation:

A combustion reaction is an oxidation reaction (usually oxidation of organic compounds). In this kind of reaction the organic compounds will react with oxygen to produce carbon dioxide and water along with heat which is generated by the reaction.

Of course if other elements beside carbon and hydrogen are in the chemical structure of the organic compound, other oxides are also generated.

A. 8 Fe + S₈ → 8 FeS  (combination reaction)

B. 2 H₂O → 2 H₂ + O₂  (decomposition reaction)

C. Zn + 2 HCl → ZnCl₂ + H₂ (single-replacement reaction)

D. NaCl + AgNO₃ → NaNO₃ + AgCl  (double-replacement reaction)

E. HBr + NaOH → NaBr + H₂O  (double-replacement reaction)

F. C₁₀H₈ + 12 O₂ → 10 CO₂ + 4 H₂O (combustion reaction)

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combustion reaction

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