How do Endothermic and Exothermic Reactions Differ?

Students need to understand the meaning of endothermic and exothermic reactions. The terms are common to science subjects, including chemistry and physics. Students may calculate the time for a particular reaction. Sciences are common across all learning institutions in the world. Students need to understand how to solve certain life issues through calculations available in science subjects. The teachers need to teach students the proper ways of solving mathematical and scientific calculations. 

Science contains different topics that concern calculations. Math is a subject that nobody ac run away from because it is used to solve complex issues concerning the living and non-living components of the environment. Endothermic and exothermic reactions involve the transfer of heat from one body to another. There are various media across which heat currents are transferred. When heat is transferred from a body, the medium relaxes, and when a body receives heat, it expands. Heat makes particles in a particular area disintegrate, and when the medium is cooled, the particles settle. 

What is the meaning of exothermic and endothermic reactions?

The prefix “Exo” in exothermic means “out of or outside,” while the prefix “endo” in endothermic means “containing, inner, absorbing or within.” The word thermic usually refers to “heat.” Therefore, an endothermic reaction means a reaction that absorbs heat from the environment, while an exothermic reaction refers to a reaction that releases heat into the environment. The two common words are used to refer to the movement of heat from one media to another. 

The scientific definition of exothermic and endothermic reactions

  • Exothermic reaction refers to any chemical change or reaction whereby heat energy is absorbed from a particular body.
  • Endothermic reaction refers to any chemical change or reaction whereby heat energy is released from a particular body.

How do the reactions work?

Chemical reactions happen on a molecular level when enough heat is supplied to reactant molecules. Enough heat breaks down chemical bonds that exist to form new bonds. All chemical reactions must contain similar components, including energy change and more than two reactants. There are different examples to illustrate how exothermic and endothermic reaction works.  

How do exothermic and endothermic reactions differ?

Examples of endothermic reactions

Melting ice – ice is in the form of a solid component arranged molecules firmly hold that. When the energy in the form of heat is introduced, the ice will absorb heat. The heat will cause the firmly held bonds to break and force water molecules to collide and move quickly. The temperature causes the solid water to transform into a liquid form. The melting of ice is an endothermic reaction because the ice absorbs heat and melts into liquid water. 

Photosynthesis  plants absorb the sun’s heat energy, transform it to NADPH and ATP, and release oxygen.

Evaporation – heat causes water molecules to be excited and causes them to collide faster; therefore, liquid changes into a gas.

Sublimation – dry ice has lower temperatures compared to ice. Exposing dry ice to higher temperatures causes it to change from solid-state to gas directly. 

An example of an exothermic reaction

Combustion: The fire to start in a chain reaction requires three components: fuel, oxygen, and heat. The reaction can take place in the endothermic and exothermic reactions lab. You need to arrange firewood, add gasoline, and light a matchstick. As the firewood burn, carbon dioxide and carbon monoxide are released.

Other exothermic reactions include condensation and oxidation.


The students studying the two reactions can compete in the endothermic and exothermic reactions science project. 

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