chp 6 gen chem DAT Flashcards
liquids and solids —
type of intramolecular forces …
metallic bonding : Cu , Cr,Fe and Be
ion ion bonding : Nacl , Li2O
cov network bonding : Carbon and Si
types of intermolecular
hydrogen bonding : H-F , H-N , H-O
dipole dipole : H-Cl , C-O, S-H
dispersions forces : also called London / van Der was
CnHx ( hydrocarbon to another non polar
types of intermolecular bonding strength
hydrogen bonds are strongest , dipole dipole , and weakest is dispersion
hydrogen bonds
when an H atom is bonded to N , O or F
dipole dipole
when a molecule has a polar bond in it , it causes a partial charge pos or neg
dispersion
non polar molecules that don’t have a dipole or hydrogen bond
strong intermolecular forces means ..
high boiling point
high viscosity
high surface tension and
low vapor pressure
high boiling point
HIGH IM FORCE
molecules with intermolecular forces are more attracted together , therefore it will take MORE heat to separate them
HIGH BP
=
HEAT OF VAPORIZATION
high viscosity
HIGH IM FORCE
the thicker the substance is the slower it pours.
HIGH VISCOSITY
high surface tension
the water molecules are experiencing downward and side to side attraction more molecules = creating a thin film in surface
HIGH IM = HIGH SURFACE TENSION
vapor pressure
when vaporization happens gas molecules escape permanently ( this is boiling )
boiling occurs when the pressure exerted by the liquid molecules upward against the atmosphere equals the pressure exerted by the atmosphere downward
HIGH IM = HIGH BP = LOW VAPOR PRESSURE
types of solids
metallic, ionic , covalent network , molecular
metallic
metallic bonding
hardness varies
melting point varies and conductivity varies
ex - Fe and Mg
ionic
Ionic boding
high melting point
brittle
hard
ex- NaCl
