Chem Module 6 Flashcards
ideal gas equation is valid for all gases at…
sufficiently low pressures
What causes deviations from the ideal gas equation
- when the pressure on a given quantity of gas is increased
what is the compressibility factor for ideal gas
1
Ideal gas neglects
- the sizes of the molecules themselves
- intermolecular forces
What do we expect of the volume to be for real gases
to be greater than or equal to an equivalent number of moles of liquid
what do we expect of the pressure for real gases
for pressure to be less than the pressure predicted by the ideal gas equation because intermolecular forces cause the molecules to be drawn inwards
What does Van der Waals equation incorporate?
a- provides a measure of the strength of the intermolecular forces
b. provides a measure of the sizes of the molecules
what processes requires energy
- vaporization (liquid to gas)
- sublimation (solid to gas)
- fusion (solid to liquid)
What processes releases energy
- condensation (gas to liquid)
- freezing (liquid to solid)
- deposition ( gas to solid)
describe dipole moment
if the centre of positive charge does not coincide with the centre of negative charge
describe polarizability of a molecule
a measure of the extent to which its charge cloud can be distorted (polarized) by another molecule .
- the larger the molecule, the larger the polarizability
London Dispersion Forces
temporary/ instantaneous dipole moment
- most attractive when molecules are large
H- bonds
this bonding carries a charge that is strongly attracted to a lone pair on another molecule (bridging two molecules)
Describe how H bonds create intermolecular (between) forces
hydrogen bond “bridges” two molecules
Describe how H bonds create intramolecular (within) forces
H bond bridges two parts of the same molecule
