Substances possess several microscopic forms of energy due to rotation, vibration, translation, and interactions among ______ of the substance.

Substances possess several microscopic forms of energy due to rotation, vibration, translation, and interactions among ______ of the substance.

• A. Atoms
• B. Molecules
• C. Ions
• D. Quarks

Answer: (B)

Energy at the microscopic level comes from the motions and interactions of the units that make up the substance. These units are molecules. A molecule can translate as a whole through space, rotate about its axes, and vibrate as bonds stretch and bend. In addition, there is potential energy from forces between neighboring molecules (intermolecular interactions) that influences the overall energy of the system. This combination—translation, rotation, vibration, and intermolecular interactions—arises from the behavior of molecules, not just individual atoms or subatomic particles. Monoatomic atoms don’t have the same rotational and vibrational modes in the way molecules do, and quarks are subnuclear; the described microscopic energy forms pertain to interactions among molecules.

Energy at the microscopic level comes from the motions and interactions of the units that make up the substance. These units are molecules. A molecule can translate as a whole through space, rotate about its axes, and vibrate as bonds stretch and bend. In addition, there is potential energy from forces between neighboring molecules (intermolecular interactions) that influences the overall energy of the system. This combination—translation, rotation, vibration, and intermolecular interactions—arises from the behavior of molecules, not just individual atoms or subatomic particles. Monoatomic atoms don’t have the same rotational and vibrational modes in the way molecules do, and quarks are subnuclear; the described microscopic energy forms pertain to interactions among molecules.