What term describes the study of energy changes in chemical reactions by applying thermodynamics?

What term describes the study of energy changes in chemical reactions by applying thermodynamics?

• A. Kinetics
• B. Thermochemistry
• C. Electrochemistry
• D. Spectroscopy

Answer: (B)

Thermochemistry deals with how energy is exchanged as heat when chemical reactions occur, using thermodynamic principles. It focuses on the heat absorbed or released during reactions, quantified by changes in enthalpy (ΔH). At constant pressure, the heat flow into or out of the system equals ΔH, which we can measure directly with calorimetry or predict from standard enthalpies of formation and Hess’s Law. This makes thermochemistry the field that specifically analyzes energy changes in chemical processes. Kinetics looks at reaction rates and mechanisms, not the energy exchanged. Electrochemistry studies energy changes in redox processes related to electrical work, while spectroscopy investigates how matter absorbs or emits light to reveal structure. So the term that best describes studying energy changes in chemical reactions via thermodynamics is thermochemistry.

Thermochemistry deals with how energy is exchanged as heat when chemical reactions occur, using thermodynamic principles. It focuses on the heat absorbed or released during reactions, quantified by changes in enthalpy (ΔH). At constant pressure, the heat flow into or out of the system equals ΔH, which we can measure directly with calorimetry or predict from standard enthalpies of formation and Hess’s Law. This makes thermochemistry the field that specifically analyzes energy changes in chemical processes.

Kinetics looks at reaction rates and mechanisms, not the energy exchanged. Electrochemistry studies energy changes in redox processes related to electrical work, while spectroscopy investigates how matter absorbs or emits light to reveal structure. So the term that best describes studying energy changes in chemical reactions via thermodynamics is thermochemistry.