Question

Differentiate between an exothermic and an endothermic reaction.
(A) Endothermic releases heat and exothermic absorbs energy.
(B) Exothermic releases heat and endothermic absorbs energy.
(C) Hydrogen gas is evolved in exothermic but not in endothermic.
(D) Hydrogen gas is evolved in endothermic but not in exothermic.

Answer 1

Hint: There are a number of chemical reactions in chemistry and they are divided into many sub and main reactions. They release energy in the form of sound, light, cold or heat. On the basis of heat two types of reactions are known, one is endothermic and the other is exothermic. Let us discuss these both.

Complete answer:
In simple terms, the endothermic reactions absorb energy from the surrounding that is in the form of heat. Since endothermic reactions draw in heat from the surrounding, they tend to cause their environment to cool down. They are also generally non-spontaneous since endothermic reactions field products that are higher in energy than the reactants. As such, the change in enthalpy for an endothermic reaction is always positive.
An exothermic reaction releases energy into the surrounding of the system. In an exothermic reaction, energy is released because the total energy of the products is less than the total energy of the reactions.

ENDOTHERMIC	EXOTHERMIC
The reaction which absorbs heat energy from the surrounding is termed as Endothermic reaction.	The reactions which releases heat energy from the surrounding is termed as Exothermic reaction
With the progress in such reactions, temperature decreases.	With the progress in such reactions, temperature increases.
Energy is supplied to the system.	System releases the energy.
The value of change in enthalpy is positive.	The value of change in enthalpy is negative.
Enthalpy of products is more than reactant.	Enthalpy of products is less than reactant.

Hence, the correct answer is (B) exothermic reactions heat and endothermic absorb energy.

Note: It should be noted that, Entropy and Enthalpy are distinctive terms, so the change in entropic energy or power can conquer a contrary change in enthalpic energy and make an endothermic reaction ideal.