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what forces do all simple covalent molecules have
intermolecular
what 3 types of intermolecular forces are there
van Der walls, dipole-dipole, hydrogen
what is the weakest intermolecular force
van der walls
what forms a van der walls force
an instantaneous dipole due to electron distribution
why does electron distribution induce dipole
electrons repel
what can increase strength of van der walls
more electrons
what molecules have van der walls
all molecules
what forms a dipole-dipole force
permanent attraction between molecules due to electronegativity and bond polarity
what must the element be to have dipole-dipole
asymmetrical
why do symmetrical molecules not have dipole-dipole
polar bonds cancel out
what is the strongest type of inter molecular forces
hydrogen bonds
how strong are intermolecular forces
weak
what elements must be present for a hydrogen bond
hydrogen and fluorine, oxygen or nitrogen
what are hydrogen bonds
direct bonds with hydrogen and a highly electronegative element
does a lone pair affect hydrogen bonding
no
what angle must hydrogen bonds be drawn at
180 degrees
what is melting point affected by
strength of intermolecular bonds
Note 
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