Question

which statement defines calorimetry?
the conservation of energy
a unit of energy that is used when calculating energy exchange
a device that is used to measure the heat that is gained or lost during a chemical change
the measurement of energy that is given off or absorbed in a physical or chemical process

Explanation:

• "The conservation of energy" is the law of conservation of energy, not calorimetry.
• "A unit of energy..." is incorrect as calorimetry is not a unit.
• "A device..." describes a calorimeter (the device), not calorimetry (the process of measurement).
• "The measurement of energy... in a physical or chemical process" correctly defines calorimetry, as it is the process of measuring heat (energy) changes in such processes.

Answer:

D. the measurement of energy that is given off or absorbed in a physical or chemical process (assuming the last option is D; if option labels are different, adjust accordingly with the correct identifier and text)