1. Analytical Chemistry: Focuses on the identification and quantification of chemical substances. Techniques include chromatography, spectroscopy, and electrophoresis.

2. Biochemistry: Studies the chemical processes occurring within living organisms, including the structure, function, and interactions of biological molecules.

3. Chemical Engineering: Applies chemistry principles to design, build, and operate chemical processes and equipment, including the production of chemicals, pharmaceuticals, and fuels.

4. Computational Chemistry: Utilizes computer simulations and theoretical models to study and predict chemical phenomena, including reaction mechanisms, molecular properties, and material behavior.

5. Environmental Chemistry: Examines the composition and behavior of chemicals in the environment, including air, water, and soil, and their impact on ecosystems and human health.

6. Inorganic Chemistry: Studies the properties and reactions of inorganic compounds, which are substances not containing carbon-hydrogen bonds, including metals, minerals, and semiconductors.

7. Materials Chemistry: Develops and studies new materials with specific properties for various applications, including electronics, energy storage, and medicine.

8. Organic Chemistry: Focuses on the study of carbon-containing compounds, including their structure, properties, reactions, and synthesis.

9. Physical Chemistry: Investigates the fundamental physical principles underlying chemical phenomena, including thermodynamics, kinetics, and spectroscopy.

10. Polymer Chemistry: Studies the synthesis, properties, and applications of polymers, large molecules composed of repeating structural units, with applications in plastics, fibers, and adhesives.