Final answer:
The scenario most likely pertains to the subject of Physics, where a chemist would study aspects of physics in order to discover new chemical reactions.
Step-by-step explanation:
Based on the scenario provided, the subject that is most likely being referred to is Physics. Physics is involved in understanding the amount of energy released or required in a chemical reaction, as well as the types of ions produced in a chemical reaction. It also plays a role in determining the physical principles involved in various fields of study. In the context of the scenario, it is likely that a chemist would study aspects of physics in order to discover new chemical reactions.