Covalent Bonding Flashcards
what is a fullerene
hollow cage of carbon atoms arranged in a sphere or tube
3 uses of fullerenes
-lubricants
-drug delivery (spheres)
-High-tech electronics
2 properties of numbers
-high tensile strength
-conducts electricity
what is a nanotube
hollow cylinder of carbon atoms
2 properties of graphene
-strong
-conducts electricity
what is graphene
a single layer of graphite
what is graphite soft
Layers aren’t bonded so they can slide
describe structure and bonding of graphite
each carbon atom bonded to three others in hexagonal rings arranged in layers
-has delocalised electrons and weak forces
why do most covalent substances not conduct electricity
don’t have delocalised electrons (aren’t molten/aqueous)
why do giant covalent substances have high melting points
takes a lot of energy to break the bonds
describe structure and bonding of polymers
many identical molecules joined together by strong covalent bonds in a long chain, with weak intermolecular forces
describe structure and bonding of small molecules
small numbers of atoms group together with strong covalent bonds and weak intermolecular forces between molecules
what type of atoms form covalent bonds
non-metals
