Question

WHAT IS EXOTHERMIC REACTION??


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Answer 1

Answer:

An exothermic reaction is a "reaction for which the overall standard enthalpy change ΔH⚬ is negative." Exothermic reactions usually release heat and entail the replacement of weak bonds with stronger ones. ... Most of the spectacular chemical reactions that are demonstrated in classrooms are exothermic and exergonic.

Answer 2

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⚽ WHAT IS EXOTHERMIC REACTION?

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⚽ An exothermic reaction is a reaction in which energy is released in the form of light or heat. Thus in an exothermic reaction, energy is transferred into the surroundings rather than taking energy from the surroundings as in an endothermic reaction. In an exothermic reaction, change in enthalpy ( ΔH) will be negative.

⚽ Therefore, it can be understood that the net amount of energy required to initiate an exothermic reaction is less than the net amount of energy released by the reaction. When a calorimeter, a device used to measure the heat released by a chemical reaction, the net amount of heat energy that flows through the device is equal to the negative of the total energy change of the system.

⚽ However, it is extremely difficult to measure or even calculate the absolute total of energy in a given chemical system. Therefore, the energy change (or the enthalpy change, denoted by ΔH) is measured instead. The relation between the value of ΔH and the bond energies of the reaction can be given by the following equation.

✨ ΔH = (energy used in the bond formation that yields products) – (energy released when the reactant bonds are broken)

✔️ Therefore, it can be understood that an exothermic reaction will always have a negative value for the change in enthalpy, i.e. ΔH < 0.

⚽ For the measurement of the enthalpy change of combustion reactions, bomb calorimeters are very suitable devices.