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Complete combustion is combustion in the presence of excess air
1. Methane 2. Air 3. Production of carbon dioxide and water vapor $ CH_4 + 2O_2 \; \rightarrow \; CO_2 + 2H_2O$
$ 2 \; C_nH_{2n + 2} + (3n + 1) \; O_2 \; \rightarrow \; 2n \; CO_2 + (2n + 2) \; H_2O $
Look at → a video that shows the complete combustion of butane and tests the products of this reaction.
Incomplete combustion is combustion in air in default.
1. Methane 2. No air inlet 3. Carbon production (which colors the yellow flame) and water vapor $ CH_4 + O_2 \; \rightarrow \; C + 2H_2O$
$ 2 \; C_nH_{2n + 2} + (n + 1) \; O_2 \; \rightarrow \; 2n \; C + (2n + 2) \; H_2O $
Look at → a video that shows the incomplete combustion of butane and the products of this reaction.