covalent bonding

Created by

Olivia-Grace

Cards (14)

what is a covalent bond? 
strong electrostatic attraction between a shared electron pair and neighbouring nuclei. non metals are similar in electronegativivty so they share outer shell electrons rather than transferring them.
what is a dative/coordinate covalent bond? 
where a pair of electrons donated by one atom to another atom,forming a shared electron pair.
what are the properties of graphite? 
electrical conductor
soft and slippery
high melting point
why does graphite have a high melting point? 
many strong covalent bonds that require large amounts of heat energy to overcome
why is graphite a good electrical conductor? 
one non bonded electrons per atom i delocalised , they flow through the structure when a voltage is applied.
why is graphite soft and slippery?
graphene layers are held together by weak van der waals intermolecular forces and so can slide over each with a small amount of force applied.
what are the properties of diamond? 
high melting point
hard material
electrical insulator
why does diamond have a high melting point? 
many strong covalent bonds that require a large amount of heat energy to overcome.
why is diamond a hard material?
many strong covalent bonds that require a large amount of force to break.
why is diamond a good electrical insulator?
diamond doesn't have any delocalised electrons that can flow through the structure and carry a charge when a voltage is applied?
what are the properties of silicon and silicon dioxide? 
high melting points
hard material
electrical insulator
why does silicon and silicon dioxide have a high melting point? 
many strong covalent bonds that require a large amount of heat energy to overcome
why is silicon and silicon dioxide a hard material?
they have many strong covalent bonds that require a large amount of force to break
why is silicon and silicon dioxide a good electrical insulator? 
there are no delocalised electrons that free to flow through the structure when a voltage is applied