bonding and structure Flashcards
what is ionic bonding
electrostatic attraction between positive and negative ions
how are ionic compounds held together
giant lattice
electrostatic between positive and negative ions holds structure together
properties of ionic substances
high melting points
do not conduct electricity when solid
conduct when molten or dissolved
what is a covalent bond
shared pair of electrons between 2 atoms
usually both non metal
structures of simple covalent
small molecules
c
don’t conduct electricity
low melting and boiling
weak intermolecular forces
what is a polymer
very larger molecules with atoms linked by covalent bonds
what are giant covalent substances
atoms bonded together in a giant lattice
example of giant covalent substances
diamond
graphite
silicon dioxide
properties of diamond
4 strong covalent bonds for each C atom
very strong
very high melting point
doesn’t conduct electricity
properties of graphite
c
why can graphite conduct electricity
one delocalised per carbon atom
properties of fullerenes
hollow shaped molecules
what carbon fullerene has a spherical shape
C60
(buckminsterfullerene)
what is graphene
single layer of graphite