A reaction is said to be an endothermic reaction when any chemical reaction occurs while breaking up the molecular bonds and forming new bonds. An endothermic reaction results in the net decrease in the temperature while absorbing heat from the surrounding and storing theme to form the bonds during reaction. An endothermic reaction often occurs when the energy that is used to break the bonds is greater than that of the energy getting released while forming the products. This means the overall temperature is taken up during the reaction causing the decrease in the overall temperature of the surroundings.
A chemical reaction is said to an exothermic reaction when the energy gets released in the form of light or heat. In exothermic reaction, the energy gets released to the surroundings. The absolute amount of energy in a chemical reaction is difficult measure. In that case, a bomb calorimeter is used for measuring the energy change during the exothermic reaction. In exothermic reaction, the change in enthalpy is negative ie., ΔH < 0 since the energy that is released during the exothermic reaction is subtracted from the energy that s used up with in the reaction.
Endothermic reaction is defined as the reaction that is accompanied by absorption of heat. It can happen in our day to day life. For example- while cooking egg, soldering metal, ejecting deodorant and many more. Other examples of endothermic reaction include:
2. Melting of Ice
3. Evaporating liquid water
4. Cracking of alkanes
5. Thermal decomposition reactions
6. Dissolving ammonium chloride in water
7. Electrolytic decomposition of sodium chloride into sodium hydroxiode and hydrogen chloride.
The equation for endothermic reaction includes:
Reactant + Heat energy ---Products
The difference between endothermic reaction and exothermic reaction lies in the words themselves. The word thermic refers to the heat or in other words thermometer. While the word Exo means outside and Endo means inside. Thus in endothermic reaction, heat is pulled inside into an object area while in exothermic reaction; heat is expelled or released outside of an object area into the surrounding. Endothermic reaction causes an cooling effect in the overall surrounding while exothermic reaction causes makes the surrounding more hotter. Endothermic reaction draws and stores energy in the form of chemical bonds that is produced during the reaction. The product of endothermic reaction usually has more volume of energy stored within the reaction. In exothermic reaction the energy is removed from the entire chemical bonds in the reactants. In exothermic reaction, the energy that is released from the reaction makes the entire surrounding area warmer. Thus it can be stated as; Endothermic reaction contains more energy while exothermic reaction contains less energy. In endothermic process, energy is released in the form of heat and in exothermic the energy is evolved or released in the form of heat. In endothermic reaction the enthalpy is positive while in exothermic reaction, the enthalpy is negative.
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