Endothermic vs. Exothermic Reactions: What's the Difference?

Key Difference

Chemical reactions by transmission of heat and energy are classified into two basic kinds of reactions that are Endothermic and Exothermic Reactions. Endothermic Reactions are those reactions which absorb heat and energy from surrounding during the reaction. The most common example of the endothermic reaction is melting of ice. On the other hand, exothermic reactions are those reactions which release heat and energy during the reaction. Making or freezing of ice and rusting of iron are the two most common examples of exothermic reactions.

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Comparison Chart

Endothermic Reaction Exothermic Reaction
Definition Endothermic process or reaction is the reaction in which energy is absorbed as heat by the reaction itself. Exothermic process or reaction is the reaction in which energy is released as heat by the reaction.
Result The energy in the form of heat is absorbed from the environment by the reaction. The energy in the form of heat is released into the environment from the reaction.
Energy Form Energy is always absorbed as a form of heat. Most of the time energy is released in the form of heat but can be in the form of light, sound, and even electricity.
Used In These reactions are applied in thermodynamics which is a branch of physics and chemistry collectively. These reactions are applied in thermodynamics which is a branch of physics and chemistry collectively.
Etymology Endothermic is a term that is derived from two Greek words Endo means inside, and thermal means heat. Exothermic is a term that is derived from two Greek words Exo means outside, and thermal means heat.
Common Examples Common examples of endothermic reactions include photosynthesis, melting of ice, evaporation process, cooking, etc. Common examples of exothermic reactions include the freezing of ice, explosions, rusting of iron, nuclear fission, and fusion reaction.
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What is Endothermic?

Endothermic reactions are the kind of chemical reaction that absorb energy as heat from the surrounding via reaction process. Endothermic is the term which is developed by the combination of two Greek words, Endo means inside, and thermasi means heat. These terms are most widely used in chemical sciences and physical sciences i.e. physics and chemistry. The application of such reaction are widely found in the field of thermodynamics which is a collective branch of physics and chemistry. In any reaction, the main concern is of energy that how it travels and passed from one side to the other side and in which form. In the endothermic reaction, energy is always absorbed in the form of heat. The most common examples relating Endothermic reactions are melting of ice, photosynthesis, cooking, evaporation, etc. In all the reaction mentioned above, heat is absorbed from the environment by the components and products of the reaction and is thus consumed as fuel or energy. The easiest way to judge and check a process or reaction whether it is an endothermic reaction or not we can just simple check by the environment and system components. If environment become cool and system components become hot, it depicts that reaction endothermic and heat is absorbed.

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What are Exothermic Reactions?

Exothermic Reactions are chemical and physical reactions in which energy is released in the form of energy. The word exothermic is also a combination of two Greek words expo which means outside, and thermal means heat. As it is mentioned above that energy in the endothermic reaction is always absorbed as heat, but unlike to that in an exothermic reaction, the case is bit different. Although most of the exothermic reaction energy is released in the form of heat, it is not compulsory like the endothermic reaction that it will always be in the form of heat. There are a variety of different kinds of exothermic reactions in which energy is released in another form such as light, sound and even electricity rather than the heat. Common sort of exothermic reaction includes the rusting of iron, freezing of ice, breaking of chemical bonds and nuclear-based fission and fusion reaction. Exothermic reactions can easily be differentiated and identified as their surrounding become hot after the release of energy and the container or the system components carrying out the reaction themselves become cool. Exothermic reactions are studies under the thermodynamics which is a collective branch of physics and chemistry. Endothermic reaction are often mixed up with endothermic reaction as in some cases the environment seems to be cold and the reaction is exothermic in nature, it can be due to the by products that absorb the energy again that is released by the reaction in from of heat.

Endothermic vs. Exothermic Reactions

  • Endothermic reactions are chemical reactions that absorb energy from the environment.
  • An exothermic reaction is kind of chemical reaction that release energy into the environment.
  • In endothermic reactions, energy is always absorbed in the form of
  • In exothermic reactions, energy is usually released in the form of heat, but it can be in the form of light sound and even electricity.

Explanatory Video

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