Physical Properties and Intermolecular Forces (Grade 12 NSC Matric Physical Sciences): Flashcards
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Intermolecular forces
Intermolecular forces
Attractive forces between molecules
Phase when intermolecular forces are weak
Phase when intermolecular forces are weak
Gas (particles move far apart)
Phase when intermolecular forces are strong
Phase when intermolecular forces are strong
Solid (particles held closely together)
Atoms H bonds to for hydrogen bonding
Atoms H bonds to for hydrogen bonding
Oxygen (O), nitrogen (N), or fluorine (F)
Intermolecular force strength order (weakest to strongest)
Intermolecular force strength order (weakest to strongest)
van der Waals < dipole-dipole < hydrogen bonding
Viscosity
Viscosity
How much a liquid resists flowing
Viscosity with stronger intermolecular forces
Viscosity with stronger intermolecular forces
Higher viscosity (more resistance to flow)
Boiling point with stronger intermolecular forces
Boiling point with stronger intermolecular forces
Higher (more energy needed to overcome forces)
Vapour pressure with weaker intermolecular forces
Vapour pressure with weaker intermolecular forces
Higher (molecules escape more easily)
Flash point with higher vapour pressure
Flash point with higher vapour pressure
Lower flash point (more flammable)