What is calorimetry?

• A. The measurement of heat transfer in chemical reactions.
• B. The study of color changes in reactions.
• C. The measurement of gas volume changes.
• D. The calculation of reaction rates.

Answer: (A)

Calorimetry is the measurement of heat transfer that occurs during chemical reactions or physical changes, using a device called a calorimeter. By tracking the temperature change of the surroundings and knowing the amount of substance and its heat capacity, you can calculate the heat exchanged (q), using relationships like q = m c ΔT or q = C_cal ΔT. This tells you how much heat the system released or absorbed and whether the process is exothermic or endothermic. Real-world examples include a coffee cup calorimeter for simple reactions and a bomb calorimeter for combustion. The other ideas involve color changes, changes in gas volume, or reaction rates, which relate to different aspects of chemistry and not to heat transfer measured in calorimetry.