Final answer:
The fields of quantum mechanics, thermodynamics, and kinetics are all part of the broader branch of chemistry, specifically focused on subatomic particles, energy changes, and reaction rates respectively.
Step-by-step explanation:
The sub-fields of quantum mechanics, thermodynamics, and kinetics are specific areas within the branch of chemistry. Quantum mechanics, which deals with subatomic particles and the quantization of energy, is indispensable for understanding the behaviors and interactions at the atomic and molecular levels in chemistry. Thermodynamics, and specifically thermochemistry, pertains to the energy changes occurring during chemical reactions, encompassing both heat and work interactions. Kinetics involves the study of reaction rates and the factors that affect them, a crucial aspect of understanding how chemical reactions proceed over time.