Step 1: The part between N and M that should be heated first is the combustion tube. Step 2: In a combustion tube, the reaction between the substance (in this case, hydrogen) and the oxidizing agent (in this case, oxygen from the air) occurs when heat is applied. Step 3: The chemical equation for the reaction occurring in the combustion tube is: 2H₂ (g) + O₂ (g) → 2H₂O (g)
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