Question

A chemical reaction in which heat and light/ flame are given out is called ___ .

Answer 1

1. Combustion is defined as the rapid oxidation/burning of any substance to produce heat and light.
2. Because heat is released during combustion, combustion is an exothermic process.
3. Example: Burning of wood
4. In wood, cellulose is present which burn in presence of Oxygen to form Carbon dioxide and water.
5. The reaction is shown below.
   $$\begin{gathered} {\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_6\left(\mathrm{s}\right)+6{\mathrm{O}}_2\left(\mathrm{g}\right)\stackrel{∆}{\to }6{\mathrm{CO}}_2\left(\mathrm{g}\right)+6{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right) \\ \mathrm{Cellulose}\mathrm{Oxygen}\mathrm{Carbon} \\ \mathrm{dioxide} \end{gathered}$$
6. Therefore, a chemical reaction in which heat and light/ flame is given out is called ___combustion__.