Q. 3 A3.6( 37 Votes )

Explain the following terms with examples.

Endothermic reaction

Answer :

Endothermic reaction: In endothermic reaction, heat is either absorbed from the surroundings or heat has to supplied from outside. It means an endothermic reaction needs or takes in heat to continue.

For example: When a solid ammonium chloride (NH4Cl) is dissolved into water, you will observe that the tube becomes colder.

NH4Cl (s) + H2O NH4Cl (aq) – Heat

In the above reaction, heat is absorbed from surroundings.

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Match the column in the following table.

MHB - Science and Technology Part-1

Identify the endothermic and exothermic reaction.

a. HCl + NaOH NaCl + H2O + heat

b. 2KClO3(s) 2KCl(s) + 3O2

c. CaO + H2O Ca(OH)2 + heat

d. CaCO3(s) CaO(s) + CO2

MHB - Science and Technology Part-1