strcuture and bonding Flashcards
(19 cards)
why do covalent substances have low melting points
.weak intermolecular forces
.small amount of energy needed to break
why are covalent substances not able to conduct electricity
no free charged particles/ ions to form a current and carry charge through structure
why do ionic compounds have high melting points
. strong electrostatic forces
. requires high amount of energy to break
why are ionic compounds hard and brittle
the ions are in a fixed place and can’t slide off eachother
name a substance with a giant covalent structure
. diamond
.graphite
.silicon dioxide
why does a diamond have a high melting point
.4 strong covalent bonds
. require a lot of energy to break
why can graphite conduct electricity
. has a delocalised electron that carries charge though the structure
what is the formula of buckminsteefullerene
c60
what are the two polymers
thermosetting and thermosoftening
which type of polymer will burn instead of melt
thermeosetting
what type of bonding do metals do
metallic bonding
why are metals malleable
. same sized atoms
. slide past eachother
why are alloys harder than metals
. different sized atoms make it harder to slide
what is a single layer of graphite
graphine
why is graphite hard to break
as it has strong covalent bonds
what are polymers made of
thousandths of small identical monemers
why are polymers solid at room temperature
as they have strong intermolecular forces
