C2 Flashcards
what are the 3 types of chemical bonding
ionic covelant metallic
what is ionic bonding
transfer of electrons from a metal to a non-metal,forming positive and negative ions
what type of structure do ionic compounds form
giant ioinc lattice
properties of ionic compounds
high melting and boiling points,conduct electricity when molten or dissolved
what is covelant bonding
the sharing of electron pairs between non-metal atoms
whats a simple molecular substance
small molecules held together by covelant bonds with weak intermolecular forces
what are the properties of simple molecular substances
low melting and boiling points,dont conduct electricity
what are the properties of diamond
very hard,high melting point,doesnt conduct electricity
properties of graphite
layer that slide,conduct electricity,high melting point
why can graphite conduct electricity
it has delocalised electrons between layers
whats graphene
a single layer of graphite-very strong,light and conducts electricity
what are fullerenes
molecules of carbon in hollow shapes or tubes
what is metallic bonding
positive metal ions surrounded by a sea of delocalised electrons
why do metals conduct electricity
delocalised electrons carry charge through the structure
what are the properties of metals
high melting points,good conductors,malleable and ductile
why are metals malleable
layers of atoms can slide over each other
what are alloys
mixture of metals with other elements to make them harder
3 states of matter
solid,liquid,gas
what changes occur during melting and boiling
particles gain energy and move more freely
what is a polymer
a long chain molecule made from many repeating units
why do polymers have high melting points
strong intermolecular forces between large molecules
what determines the properties of a substance
the type of bonding and structure it has
