Question

difference between thermal and exothermic reaction​

Answer 1

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❥The difference between endothermic and exothermic reactions lies in the words themselves."Thermic" refers to heat, just as in the word "thermometer." "Exo" means "outside" and "endo" means "inside." Thus, an endothermic reaction pulls heat into an object or area, while an exothermic reaction expels heat.

Answer 2

Answer:

Such chemical reaction in which the energy is absorbed in the form of heat is known as the endothermic reaction, while such chemical reactions in which energy is released or evolved in the form of heat is known as the exothermic reaction. So the main difference between these terms lies in the form of energy used or released during any chemical reaction.

Chemical reactions not only takes place in laboratories, they happen in ones day to day routines, in our body also. For instance melting of ice cubes or evaporation of liquid water is an endothermic reaction, on the other hand, if the water freezes into ice cubes it is called as an exothermic reaction.

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ENDOTHERMIC REACTIONS

Chemical reactions involving the use of energy at the time of dissociation to form a new chemical bond is known as the endothermic reaction.

The endothermic process requires energy in the form of heat.

ΔH is positive, as heat is absorbed.

Eg :

1. Conversion of ice into water vapour through boiling, melting or evaporation.

2. Breaking of the gas molecules.

3. Production of anhydrous salt from hydrate.

EXOTHERMIC REACTIONS

Chemical reactions where the energy is released or evolved in the form of heat is known as the exothermic reaction.

The exothermic process evolves or releases in the form of heat.

ΔH is negative, as heat is evolved.

Eg : 1. Formation of ice from water.

2. Burning of coal (combustion).

3. The reaction between water and the strong acid.

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