Regents Chemistry Exam August 2024 Question 44
44 Which equation represents a combustion reaction?
(1) Cl2 + 2NaBr → 2NaCl + Br2
(2) 2CH3OH + 3O2 → 2CO2 + 4H2O
(3) 2K + 2H2O → 2KOH + H2
(4) BaS + 2H2O → Ba(OH)2 + H2S
Solution:
In a combustion reaction, hydrocarbon reacts with oxygen to produce carbon dioxide and water. Choice 2 is the correct answer. A combustion reaction will always have O2 on the reactant side.
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