covalent bonding Flashcards
explain covalent bonding
atoms make covalanet bonds by sharing pairs of electrons with other atoms.
Each covalent bond provides one extra sharded electron for each atom.
In covalent bonding there is a strong electrostatic attraction between the negativly sharged shared electrons and the posativly charged nuclei of the atoms involved
what are atoms that are joined by strong covalent bonds called
simple molecular substances
what is between simple molecular substances
weak intermolecular forces which are easily broken
what are atoms within a molecule held together by
very strong covalent bonds
what are the attarctions between molecules that are covalently bonded
weak inter molecular forces
what are giant covalent substances
substances that bonded to each other by strong covalent bonds. There are lots of these bonds so alot of energy is needed to break them, so they haev high melting and boiling points.
do giant covant substances conduct
no not even when moulten except for graphite
what are giant covalent sunstances made by
carbon atoms
why doesnt diamond conduct electricity
there are no free electrons or ions
why can graphite conduct electricty
only three out of each carbon’s four outer electrons are used in bobs, so each carbon atom has one electron that’s delocalised and can move.
what is the defonition of a covalent bond
the electrostatic attractions between the nuclei atoms
what are the 2 things substances containing covalent bonds can be
simple molecular or giant covalent
why is diamond hard
beacuse there are strong covalent bonds hold the atoms in a very rigid lattice so its really hard
what is graphite soft
the layers of carbon atoms are only held together by weak inter moleculer forces so are free to slide over each other this makes graphite soft and slippy
