Which of the following bulk properties of substances are affected by intermolecular forces?

• A. Atomic number
• B. Isotopic abundance
• C. Boiling point
• D. Molar mass

Answer: (C)

Verified step by step guidance

1. Understand that bulk properties of substances are macroscopic characteristics that depend on how molecules interact with each other.
2. Recognize that intermolecular forces are the attractions between molecules, such as hydrogen bonding, dipole-dipole interactions, and London dispersion forces.
3. Analyze each property: Atomic number is a property of individual atoms and does not depend on intermolecular forces.
4. Isotopic abundance relates to the distribution of isotopes in a sample and is independent of molecular interactions.
5. Boiling point is a bulk property that depends on the strength of intermolecular forces because stronger forces require more energy (higher temperature) to separate molecules into the gas phase.