Writing an extended essay in chemistry is a great opportunity to explore a particular field of study in more depth than it is possible in the more constrained confines of the standard chemistry syllabus. There is a wide range of topics that can be explored, however, some examples include the following:

The Effect of pH on the Rate of Enzyme Activity: This project could involve testing different enzymes at different pH levels to determine their rate of activity. It could then be related to the structure and functionality of the enzyme.

The Chemistry of Food: Exploring the chemical composition of different foods, such as carbohydrates, proteins, and fats, as well as their role in human nutrition.

Synthesis of Organic Compounds: Investigating the synthesis of organic compounds, including the use of catalysts, reagents, and solvents.

Catalytic Reactivity: Exploring different catalysts and their ability to increase the rate of reaction or cause changes in product yields.

Spectral Characterization of Molecules: Using spectroscopic data to investigate the structure and reactivity of molecules.

These are just a few of the many possible topics that could be explored in an extended essay in chemistry. It is important to remember that an extended essay requires an argument to be presented and supported with evidence. Therefore, it is essential to make sure that the topic chosen has enough literature available to draw from and to ensure that the argument is well-constructed and supported by evidence. Additionally, it is essential to follow the guidelines provided by the International Baccalaureate organization when writing an extended essay in chemistry.