What happens when peanuts burn?

Peanuts are composed of various organic compounds, including fats, proteins, and carbohydrates. When these compounds are exposed to high temperatures, they undergo chemical changes, resulting in the process of combustion. During combustion, the oxygen in the air reacts with the carbon and hydrogen atoms present in peanuts, releasing energy in the form of heat and light.

Here is a more detailed explanation of the chemical reactions that occur when peanuts burn:

1. Decomposition of Organic Compounds:

When peanuts are exposed to high temperatures, they begin to decompose. This means that the complex organic molecules break down into smaller molecules, including volatile hydrocarbons, carbon monoxide, and water vapor.

2. Ignition:

As the temperature continues to rise, the volatile hydrocarbons reach their ignition point, which is the temperature at which they spontaneously ignite and start burning. This ignition typically occurs around 200 degrees Celsius (392 degrees Fahrenheit).

3. Oxidation and Exothermic Reactions:

Once the hydrocarbons ignite, they react with oxygen in the air through a process called oxidation. This reaction produces carbon dioxide, water vapor, and additional heat. The heat released during these exothermic reactions sustains the combustion process, causing the fire to spread and intensifying it.

4. Formation of Soot and Smoke:

During the combustion process, some of the carbon particles produced do not completely burn and form soot. Soot is a fine black powder that can escape into the air as smoke. Smoke also consists of other combustion byproducts, including water vapor, carbon monoxide, and nitrogen oxides.

5. Ash and Charring:

As the peanuts continue to burn, the organic material gradually gets consumed, leaving behind a charred residue. This residue primarily consists of mineral matter, such as potassium, calcium, and phosphorus, which form ash.

It's important to note that the specific composition of the combustion products can vary depending on factors like the exact type of peanuts, the temperature, the availability of oxygen, and the presence of other substances in the environment.