Chemical Bonding, structure and properties Flashcards
What happens when a non-metal reacts with a metal?
there’s a transfer of electrons
metal atoms lose e-
non-metals gain e-
these ions formed will have a full outer shell like noble gases
and this forms an ionic compound with a giant lattice of positive and negative ions
with ionic bonding
What is ionic bonding?
overall electrostatic attraction between positive and negative ions
what happens when non-metals react with non metals?
they share electrons to form molecules with covalent bonding
What is a covalent bond?
pair of electrons shared between two atoms
What is the formula for Nitrate ions?
NO3-
What type of melting points do ionic compounds have?
high melting points therefore solid at room temperature
Can ionic compounds conduct electricity?
no as there are no free ions in solid ionic compounds
however if molten yes as ions can carry the charge
What is the charge of:
Na,Mg, Al, O,F,Li,K,Ba,S,Ca,Cl,Br,I?
1,2,3,2-,1-,1,1,2,2-,2,1-,1-,1-
Melting and Boiling points of covalent structure?
low b.p and m.p as it’s to overcome the weak intermolecular forces between molecules
the conductivity of electricity in covalent structures?
do not conduct electricity
no delocalised electrons to carry charge
B.p and M.p of giant lattice covalent structures?
very high b.p and m.p
lots of strong covalent bonds to over come
Does graphite and graphene conduct electricity
yes as it contains delocalised e- but not many giant structures do conduct electricity
Are diamond, silicon and graphite hard?
graphite is not hard as the layers of the covalently bonded molecules are bonded together therefore can slide over each other
melting points of metals?
high m.p
metallic bonding is strong as there is a strong attraction between positive metal ions and the delocalised electrons
can metals conduct electricity?
yes as the delocalised e- can carry charge
