Final answer:
Oxygen is essential for combustion reactions to occur. Hydrogen gas produces water when burned, emitting minimal greenhouse gases. Combustion analysis involves heating compounds with oxygen to determine elemental composition.
Explanation:
Oxygen is the gaseous element required for combustion reactions to take place. In combustion reactions, oxygen acts as a crucial reactant and is present in the products formed.
Hydrogen gas, when burned, produces only water (H₂O) as a byproduct, making it an ideal fuel with minimal greenhouse gas emissions.
Combustion analysis in chemistry involves heating a compound in the presence of oxygen gas to determine its elemental composition based on the gaseous products formed.
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