Question

A ____________ process in which a substance reacts with __________ to give off heat is called combustion.

• A. chemical
• B. oxygen

Answer 1

Combustion: A chemical process in which a substance reacts with Oxygen $\left({\mathrm{O}}_2\right)$ to give off heat is called combustion.

• Examples: Combustion of Methane is shown below in the form of a chemical equation
• $\underset{\left(\mathrm{Methane}\right)}{{\mathrm{CH}}_4\left(\mathrm{g}\right)}+\underset{\left(\mathrm{Oxygen}\right)}{2{\mathrm{O}}_2\left(\mathrm{g}\right)}\to \underset{(\mathrm{Carbon}\mathrm{dioxide})}{{\mathrm{CO}}_2(\mathrm{g}})+\underset{\left(\mathrm{Water}\right)}{2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right)+\mathrm{Heat}}$

Therefore, a chemical process in which a substance reacts with oxygen to give off heat is called combustion.