structure and bonding Flashcards
What is an ionic bond?
STRONG electrostatic attraction
between oppositely charged ions
physical properties of ionic bonding
high melting and boiling points
how can ionic compounds conduct electricity
when melted or dissolved in water
(aqueous)
when is a covalent bond formed?
when a pair of electrons is shared
between 2 atoms leading to noble gas configurations.
what 2 types of covalent bonding are there ?
Giant, Simple
Giant covalent structures have…
Many atoms and bonds
Simple molecules have…
A small group of atoms
Graphite is a lubricant because…
the layers can easily slide over each other
In graphite……each ——–
is bonded to —- other
carbons by —— covalent
bonds. It forms layers of
hexagonal rings and —- ——. Between layers
there are ——- forces.
In graphite……each carbon is bonded to 3 other carbons by strong covalent bonds. It forms layers of hexagonal rings and free electrons. Between layers there are weak forces.
Graphite conducts electricity because…free
free electrons can move through layers.
In diamond each carbon is bonded to…
4 other carbons by strong covalent bonds.
Diamond is very — due to —- —- bonds so can
be used in —– —–.
Diamond is very hard due to many strong bonds so can
be used in cutting tools.
Simple covalent molecules do not…
Molecules do not conduct electricity because they have no charged particles.
simple covalent molecules have low melting and boiling points because…
intermolecular forces are overcome and these are weak forces.
