Which statement best describes the difference between intramolecular and intermolecular forces?

• A. Intramolecular forces are responsible for phase changes, while intermolecular forces determine molecular geometry.
• B. Intramolecular forces hold atoms together within a molecule, while intermolecular forces are attractions between separate molecules.
• C. Intermolecular forces occur only in ionic compounds, while intramolecular forces occur in covalent compounds.
• D. Intramolecular forces are weaker than intermolecular forces.

Answer: (B)

Verified step by step guidance

1. Step 1: Understand the definitions of intramolecular and intermolecular forces. Intramolecular forces are the forces that hold atoms together within a single molecule, such as covalent bonds or ionic bonds.
2. Step 2: Recognize that intermolecular forces are the forces of attraction or repulsion between separate molecules, such as hydrogen bonding, dipole-dipole interactions, and London dispersion forces.
3. Step 3: Note that intramolecular forces are generally much stronger than intermolecular forces because they involve the sharing or transfer of electrons to form chemical bonds within molecules.
4. Step 4: Understand that intermolecular forces influence physical properties like boiling point, melting point, and phase changes, while intramolecular forces determine the chemical identity and structure of the molecule.
5. Step 5: Conclude that the best description is that intramolecular forces hold atoms together within a molecule, while intermolecular forces are attractions between separate molecules.