Final answer:
Physical chemistry is the branch of chemistry that relates substances' physical properties to their chemical composition and transformations, focusing on phenomena like reaction rates and molecular structures.
Step-by-step explanation:
Physical chemistry is the branch of chemistry that relates the physical properties of substances to their chemical composition and transformation. This field of chemistry is essential for understanding the physical changes and chemical reactions that matter undergoes. By studying physical chemistry, we can explore phenomena like reaction rates, energy transfers in reactions, and the molecular structure of materials.
Chemistry, as a broad science, includes the study of the composition, properties, and transformations of matter. Within chemistry, there are various subdivisions such as inorganic, organic, analytical, and biochemistry, but physical chemistry specifically bridges the gap between the physical and chemical sciences.