H2+ ½ O2 → H2O + 285kJ is an example of a(n)

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Exothermic reaction

Explanation:

Notice that the energy component is located on the right side of the reaction. The right side is always known as the product side. Whenever energy is located there, the reaction is known to give off energy - essentially, we can say that energy is a product, as well. Reactions that give off energy are known as exothermic reactions.

On the other hand, if the energy component was located on the left side, or reactant side, of the equation, it would be known as an endothermic reaction.

Here, it's exothermic.

Hope this helps!

while cooking a piece of 1/2 pound beef steak, a cast iron pan (2.4kg in weight) was heated 260 celsius.