Domain 3: Chemical Reactions & Chemical Bonds

Predicting Molecular Properties

Substances have molecular properties that can be predicted.
Molecular properties are determined by intermolecular forces that are determined by intramolecular chemical bonds.
Intramolecular forces (chemical bonds) are stronger than intermolecular forces (forces between molecules).
Molecular properties include melting point, boiling point, volatility, and viscosity.
Substances with high melting points and high boiling points have strong intermolecular forces and thus require more energy to break the intermolecular forces (not bonds).
The greater the viscosity of a liquid, the stronger the intermolecular forces are and the slower the flow of the liquid.
Liquids that are volatile evaporated quickly because the intermolecular forces are weak and easily broken (not bonds).

Use this Quizlet review to learn key terms related to the content.

Predicting Molecular Properties Images

Predicting Molecular Properties - GMC

This video discusses London Dispersion forces, Ion-Dipole forces, Dipole-dipole forces, and Hydrogen Bonding.

This video describes the difference between melting points and boiling points using examples.

This video talks about ionic, covalent, metallic bonds, and discusses the properties as a result of each type of bond.

This video discusses covalent and ionic bonds and teaches how to tell the difference between the two by looking at a compound.

This video describes volatility using water and ethanol and explains how volatility occurs.

Boiling point, melting point, volatility (rate of evaporation) and viscosity are molecular properties.

Molecular properties are determined by intermolecular forces which are determined by intramolecular chemical bonds.
The boiling point is the temperature at which a material changes from a liquid to a gas (boils) .