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Intermolecular force

part 1

what does covalent bonds determine? molecular shape, bond energies, chemical properties
Intermolecular forces (non-covalent bonds) influences what? physical properties of liquids and solids
the lack of significant attractive force between gas molecules, allow a gas to do what? to fill its container
What if the attractive forces of gas molecules become significant? (like under high pressure) the gases exhibit non-ideal behavior
why can liquid assume the shape of their containers? because the attractive forces are not strong enough to keep neighboring molecules in a fixed position and molecules are free to move past or slide over one another
crystalline the molecules in a solid adopt a packing arrangement
Why are solid rigid? because of the strong intermolecular forces between neighboring molecules
kinetic energy keeps molecules apart and moving around
intermolecular forces try to do what? draw particles together
what 2 things can change the state of a substance temperature and pressure
heating and cooling can change the (blank) of particles in a substance kinetic energy
how does increasing the P increase the strength of intermolecular forces? by forcing the molecules closer together
what if you increase the pressure on a liquid? it may change to a solid
What if you decrease T and increase P? the molecules are closer (tighter) together
what if you increase T and decrease P? the molecules are farther from each other
is intermolecular force weaker or stronger than covalent bonds? weaker
How does a molecular substance states while the atoms within the molecule are unchange? because intermolecular bonds are much weaker than covalent bonds.
the temperature at which liquid boils reflects what? the kinetic energy needed to overcome the attractive intermolecular force
the strength of the intermolecular forces determines what? the physical properties of the substance
Name the attractive forces between neutral molecules dipole-dipole, London dispersion, hydrogen bonding
van der Waals forces dipole-dipole and dispersion forces
name the force between neutral and charged (ionic) molecules ion-dipole forces
Ion dipole force charged ion and polar molecule interaction; cations are attracted to the neg. end of the dipole and anion to the pos. end;
dipole-dipole forces between neutral polar molecules; weaker than ion-dipole forces;
for substances with similar molecular mass, how do you increase its boiling point? by increasing dipole moment
London dispersion force are only significant when atoms are close together
polarizability means what? how easy it is for an electric field to induce a dipole with a molecule
dispersion forces increase with what? with increasing molecular mass
hydrogen bonding a hydrogen atom experience an attractive force with a neighboring electronegative molecule/ion which has an unshared pair of electrons
Are hydrogen bonds weak or strong? weaker than typical covalent bonds, but stronger than dipole-dipole and/or dispersion forces
dispersion force increase in strength with what? increasing molecular weight
Created by: Tiffastic