Chemistry: Environmental Systems - Fertilizers, Ozone Formation, and Ozone Depletion

Fertilizers are substances added to soil to provide essential nutrients for plant growth, primarily Nitrogen ($N$), Phosphorus ($P$), and Potassium ($K$). Nitrogen is crucial for leaf growth and protein synthesis.

The Haber Process is the industrial method used to produce ammonia ($NH_3$), which is a primary component of nitrogen-based fertilizers. It involves the reversible reaction: $N_{2(g)} + 3H_{2(g)} \rightleftharpoons 2NH_{3(g)}$.

Eutrophication is an environmental issue where excess fertilizers wash into water bodies (leaching), causing rapid growth of algae (algal bloom). This leads to oxygen depletion and the death of aquatic life.

Ozone ($O_3$) in the stratosphere is formed naturally when high-energy Ultraviolet ($UV$) radiation splits oxygen molecules ($O_2$) into individual atoms, which then react with other $O_2$ molecules.

Ozone Depletion occurs when Chlorofluorocarbons (CFCs) reach the stratosphere and are broken down by $UV$ light to release chlorine radicals ($Cl \cdot$). These radicals act as catalysts that break down ozone into oxygen gas.

Ground-level ozone (tropospheric ozone) is a pollutant and a major component of photochemical smog, formed by reactions between nitrogen oxides ($NO_x$) and volatile organic compounds ($VOCs$) in the presence of sunlight.