chem chapt 12 rev

which one is weaker, IMFs or covalent/ionic bonds

IMFs

(intermolecular forces)

explain intramolecular forces and give examples

occurs within molecules

covalent and ionic bonding

stronger

remains after a physical process

explain intermoelcular forces

occurs between molecules

weaker

affected from physical processes

which has permanent and nonpermanent dipole moment

options: polar and nonpolar molecules

polar molecules: have permanent dipole moment

nonpolar molecules: nonpermanent dipole moment

explain dipole-dipole attraction

polar molecules interact with other polar molecules

partial neg attracts partial positive and creates permanent bonds

explain hydrogen bonding

when hydrogen bonds with an electronegative atom

ex: O, N, F ushe and also other molecules

they easily pull H+ and create a stronger bond

explain london dispersion forces

electrons surrounding atoms are in constant random motion and can have an immediate(instantaneous( temporary dipole moment with neighobring molecules

the ____ the molecule, the ____ the LDF

because the electrons=….

bigger, stronger

fjrther away from the nucleus so it’s easier to deviate/move around

when does size come into play

when the type of IMF is the same

what are ion-dipole interactions

an interaction between an ion and a polar molecule

happens when it’s dissolved in water

strongest type of IMF

list the IMF forces from strongest to lowest

ion-dipole interaction

hydrogen bonding

dipole-dipole bonding

London dispersion forces

what is sublimation

solid to gas

what is deposition

gas to solid

what is gas to liquid

condensation

what phase changes have a positive enthalpy

solid to liquid

liquid to gas

solid gas

what has a negative enthalpy

gas-liquid

liquid-solid

gas-solid

where does a phase change occur on a heating curve

the flat parts ——

what does the enthalpy of fsublimation equal

the enthalpy of fusion + vaporization

which of endothermic and exothermic is negative and positive

endothermic=positive

exothermic=negative

what is melting also called

fusion

Calculate the energy required to melt 17.5g of ice at 0C for water if the delta H=6.2 kj/mol

6.0 kj

the ___ the IMF, the ____ the vapor pressure

stronger, weaker

the ____ the temperature, the ____ the vapor pressure

hgiher, stronger

what 2 thinigs does vapor pressure rely on

IMF and temperature

what is boiling point

the temperature at which the equilibrium pressure=the atmospheric pressure

Calculate the energy required to melt 10.0 g of ice at 0 °C. The molar enthalpy of fusion of water is ΔH_fus = 6.2 kJ/mol.

3.44 kJ