Combustion of Ethanol
When ethanol (C2H5OH) is burnt in the presence of oxygen, a chemical reaction takes place, resulting in the formation of carbon dioxide (CO2), water (H2O), and the release of heat energy. This reaction is known as combustion.

Chemical Equation
The chemical equation for the combustion of ethanol can be represented as:
C2H5OH + 3O2 → 2CO2 + 3H2O + heat energy

Explanation
- When ethanol is burnt, it reacts with oxygen (O2) from the air.
- The carbon atoms in ethanol combine with oxygen to form carbon dioxide (CO2), while the hydrogen atoms combine with oxygen to form water (H2O).
- The heat energy is released during this exothermic reaction, which is why combustion reactions are often used as a source of heat or energy.

Importance of Combustion
- Combustion of ethanol is a common method used to produce heat energy in industries and households.
- The heat energy released during combustion can be harnessed to generate electricity or for heating purposes.
- Ethanol is also a renewable fuel source, making it a more sustainable option compared to fossil fuels.

Environmental Impact
- While ethanol combustion produces carbon dioxide, a greenhouse gas, it is considered a cleaner alternative to fossil fuels as it is derived from plant sources.
- The carbon dioxide released during ethanol combustion is offset by the carbon dioxide absorbed by the plants during photosynthesis, making it a carbon-neutral fuel option.
In conclusion, the combustion of ethanol results in the formation of carbon dioxide, water, and the release of heat energy. This reaction plays a vital role in energy production and is a more sustainable option compared to traditional fossil fuels.