What is the chemical change happening to tobacco leaves when left exposed in the air? and what happens to the molecules in each object as they change?

Answer 1

When tobacco leaves are exposed to air, there are several chemical changes that occur. These changes are primarily due to oxidative reactions.

1. Oxidation of sugars: The sugars present in tobacco leaves undergo oxidation when exposed to air. This process leads to the breakdown of complex sugars into simpler molecules, such as carbon dioxide and water, along with the release of energy.

2. Polymerization of phenols: Tobacco leaves contain phenolic compounds, which can undergo polymerization reactions in the presence of oxygen. This process results in the formation of dark-colored compounds known as polyphenols. These polyphenols contribute to the characteristic flavor and aroma of tobacco.

3. Oxidation of nicotine: Nicotine, the primary addictive compound in tobacco, is also subject to oxidation when exposed to air. This oxidation leads to the formation of nicotine oxide and other degradation products.

Overall, the exposure of tobacco leaves to air triggers various chemical reactions, resulting in the breakdown, polymerization, and oxidation of different compounds present in the leaves. The specific changes in molecules and their structures depend on the composition of the tobacco leaves and the atmospheric conditions.