One example is the reaction between magnesium and oxygen to form magnesium oxide, which releases heat and is both a combination reaction and exothermic.
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An example of an exothermic combination reaction is the formation of water from its elements hydrogen and oxygen:
2H₂(g) + O₂(g) → 2H₂O(l)
In this reaction, hydrogen and oxygen molecules combine to form water molecules, releasing heat energy to the surroundings. The formation of new bonds in water releases more energy than is required to break the bonds in hydrogen and oxygen, resulting in an exothermic process.
Certainly, the combustion of hydrogen gas (H₂) with oxygen gas (O₂) to form water (H₂O) is an example of a combination reaction that is also exothermic. The balanced chemical equation for this reaction is:
2H₂(g) + O₂(g) → 2H₂O(l)
This reaction releases a significant amount of heat energy to the surroundings. It is not only a combination reaction, as simpler substances combine to form a more complex compound (water), but also exothermic, as indicated by the heat release during the process.