chem 2 weak interactions and semiconductors

doping

adding a small amount of another element into semiconductor (metaloid)

intramolecular forces

combo of attractive and repulsive electrical forces between pairs of electrons within a molecule

intermolecular force

forces between molecules and between molecules and ions that have a large impact on physical properties of all substances

factors affecting intermolecular force strength

motion of molecules, distance between molecules - greater distance=weaker

boiling point trend

greater molecular mass=greater energy needed to reach gas phase, increases as atomic number increases

dispersion/London forces

intermolecular force between nonpolar molecules caused by a temporary dipole in molecules. weakest IM force, dipole-dipole interaction

strength of dispersion forces

1- size of atoms/molecule- large=more polarizable, dispersion increases w polarizability

2- shape of molecule- more surface area=more interactions between molecules, linear have higher dispersion