Question

Define endothermic reaction with examples.

Answer 1

Endothermic reactions are those in which heat is being taken up from the surroundings to complete the reaction.

Examples of endothermic reactions are:

• Photosynthesis is an example of an endothermic reaction

$6{\mathrm{CO}}_2+6{\mathrm{H}}_2\mathrm{O}+\mathrm{sunlight}\to {\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_6+6{\mathrm{O}}_2$

Photosynthesis is an endothermic reaction. It can not be completed without sunlight. This light energy from the sun is absorbed by a green pigment called chlorophyll in the leaves.

• Formation of nitric oxide

$$\begin{gathered} {\mathrm{N}}_2\left(\mathrm{g}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)\stackrel{∆}{\to }2{\mathrm{NO}}_{}\left(\mathrm{g}\right) \\ \left(\mathrm{nitrogen}\right)\left(\mathrm{oxygen}\right)(\mathrm{nitric}\mathrm{oxide}) \end{gathered}$$

Here nitrogen and oxygen will combine together in the presence of heat to form nitric oxide