Question

What is an endothermic change?

Answer 1

Endothermic change:

Those chemical changes in which heat energy is required to carry out the reaction or to initiate the reactions,are called endothermic changes.

Example of endothermic change/ reaction is:

Decomposition of limestone to produce calcium oxide and carbon dioxide.

${\mathrm{CaCO}}_3\stackrel{}{\left(\mathrm{s}\right)\stackrel{∆}{\to }\mathrm{CaO}\left(\mathrm{s}\right)+{\mathrm{CO}}_2\left(\mathrm{g}\right)}$