Endothermic and exothermic are types of chemical reactions. It must be noted that chemical reactions do not happen only inside the four walls off a laboratory; it takes place in every aspect of one’s daily life including within the body of the living beings. The chemical reactions require a lot of energy to take place due to the existing bond which holds molecules together. Thus when any reaction takes place between such molecules and compounds, it results in breaking of the bonds and releases energy at immense amount.
As per Ricky, an subject matter expert at My Assignment Help, “After the reaction takes place. There is formation of new chemical bonds, they require their own energy which is why when energy is calculated. It is done by the number of bonds that are broken and then formed. This process is termed as heat of reaction known as enthalpy. And it is denoted by ‘ΔH’ which is expressed in kJ/mol“.
Figure: Exothermic vs. Endothermic Reactions
Endothermic Reaction Definition:
The word endothermic, when broken up into two fragments becomes ‘endo’ and ‘thermic’; ‘endo’ means to ‘absorb’ and the word ‘thermic’ denotes a meaning which refers to ‘heat’. Thus endothermic reaction can be defined as a type of chemical reaction where the conversion of reactant into some product creates an energy that is absorbed. The absorption of energy happens due to the dissociation of the bonds existing between the molecules. Later when new bonds are created then the energy is released.
In the type of endothermic reaction, the products comprises of more energy than the reactants possess. Endothermic reaction tend to take the heat up from the surroundings because of the temperature of system wherein thee reaction which is going on is seen to remain cooler. At the end of an endothermic reaction, even the enthalpy or ΔH becomes higher.
Examples of endothermic reactions include Photosynthesis, conversion of ice through melting, evaporating or boiling and also when ammonium chloride is taken in a test tube to dissolve in water, endothermic reaction takes place:
Exothermic Reaction Definition:
Exothermic reaction is exactly the opposite of endothermic reaction; it is that type of chemical reaction where the energy, unlike that in endothermic reaction, is released or even evolved. This kind of chemical reaction is warmer and at times they are even dangerous if the reaction takes place at a higher rate.
In this kind of reaction the value of enthalpy or ΔH is always in the negative grounds since the amount of energy released during the reaction and the formation of the new bonds is higher than the total amount of energy. Some examples of endothermic reactions include combustion, formation of ice, respiration or digestion of food and more.
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