Examples of endothermic reactions

To understand the differences between endothermic and exothermic reactions, it is necessary to keep in mind the following:

• An endothermic reaction absorbs energy, while an exothermic chemical reaction releases it as heat.
• If the energy comes from the environment, it is an endothermic reaction. On the other hand, if its energy comes from the combination of reactants, it is an exothermic reaction .
• When the energy production is not spontaneous, it is an endothermic reaction. When it occurs spontaneously, it is exothermic.
• If the temperature decreases after the process, it is an endothermic reaction. If the temperature rises, it is exothermic.

Examples of Endothermic Chemical Reactions

There are countless examples of endothermic chemical reactions . The most common and easiest to observe is photosynthesis. Through this reaction, plants capture energy from sunlight and thus can produce glucose from carbon dioxide and oxygen. Other examples of endothermic reactions are:

• Chemical decomposition of water (H ₂ O) into hydrogen and oxygen.
• Mixture of water and ammonium nitrate.
• Decomposition of calcium carbonate (CaCO ₃ ).
• Ozone production (O ₃ ).
• Reaction of iron with sulfur to produce ferrous sulfide.
• Decomposition of carbon dioxide to obtain carbon and oxygen.
• Mixture of water with potassium chloride.
• Decomposition of ammonia (NH ₃ ) into hydrogen and nitrogen.
• Decomposition of proteins by the action of heat.

Examples of endothermic processes

In addition to exothermic reactions, there are endothermic processes, in which heat absorption occurs . Some examples of endothermic processes are:

• Melt ice cubes.
• Melt solid salts.
• Evaporate liquid water.
• Convert frost to water vapor.
• Synthesize an anhydrous salt from a hydrate.

Bibliography

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• Valenzuela Calahorro, C. General and inorganic chemistry for pharmacy students. (2002). Spain. Editorial University of Granada.
• Petrucci, R. General Chemistry . (2017). Spain. pearson.