Respuesta :
Exothermic Reaction:
Releases heat.
Example: A + B → C + D + heat
Endothermic Reaction:
Absorbs heat.
Example: X + Y + heat → Z + W
Exothermic reactions release energy (positive value), while endothermic reactions absorb energy (negative value).
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Exothermic and endothermic reactions are terms used to describe the direction of heat flow during a chemical reaction:
Exothermic Reaction:
In an exothermic reaction, heat is released or given off to the surroundings. This means that the products of the reaction have lower energy than the reactants, resulting in a net release of energy in the form of heat.
Examples of exothermic reactions include:
Combustion reactions such as burning wood or gasoline.
Neutralization reactions, like the reaction between hydrochloric acid and sodium hydroxide to form water and salt.
Many oxidation reactions, like the rusting of iron.
Endothermic Reaction:
In an endothermic reaction, heat is absorbed from the surroundings. This means that the products of the reaction have higher energy than the reactants, requiring an input of energy, usually in the form of heat, to proceed.
Examples of endothermic reactions include:
The dissolution of ammonium chloride in water.
Photosynthesis, where carbon dioxide and water are converted into glucose and oxygen in the presence of sunlight.
The decomposition of calcium carbonate into calcium oxide and carbon dioxide when heated.
In summary, exothermic reactions release heat energy, while endothermic reactions absorb heat energy from the surroundings.
