IMFA

• Forces holding solids and liquids together. Intermolecular Forces
• Intermolecular forces are the attraction and repulsion between molecules.
• Intermolecular forces are chemical bonds. True or False?

  False
• IMF substance may exhibit a function of charge, polarity, and molar mass.
• IMF is important in determining solubility of gases, liquids and solids in various solvents.
• IMF is crucial in determining biologically important molecules like DNA and proteins.
• STAGES OF MATTER:

  ordered, low kinetic energy. Solid
• STAGES OF MATTER:

  relatively close, moderate kinetic energy. liquid
• STAGES OF MATTER:

  far apart, high kinetic energy. gas
• Chemical bonds = intra molecular forces
• particle attraction = inter molecular forces
• Intramolecular forces focus on molecular stability (ionic and covalent)
• Intermolecular forces focus on bulk properties (freezing/boiling point)
• Collective name of IMF. van der waals forces
• occurs between ions and polar solvents. ion - dipole
• occurs between polar molecules. dipole - dipole
• occurs between all molecules, mostly seen on non-polar molecules. london dispersion
• occurs between O-H, N-H, F-H bonds. Hydrogen bonding
• Boiling point increases with molecular weight and surface area
• IMFA increases with increasing polarization of bonds
• forces that govern charged particles are defined by coulomb 's law
• Dipole-dipole forces bind molecules having permanent dipoles to one another
• The measure of polarity of a bond. debye
• Hydrogen bonding explains the phenomena of capillary action, surface tension and floatation of ice
• water reaches maximum density at 4 C
• Polar molecules (e.g. water) can temporarily induce or create dipoles in molecules without permanent dipoles. induced dipole forces (debye forces)
• formation of dipoles in 2 nonpolar molecules due to asymmetrical distribution of electron cloud. induced dipole - induced dipole
• larger molecule = easily polarized
• degree of electron cloud to be distorted. polarizability