ionic, metallic, molecular + giant covalent

Question 1

where are giant lattices present in?

Answer 1

ionic solids (giant ionic lattices)
covalently bonded solids e.g. diamond, graphite and silico (IV) oxide (giant covalent lattices)
solid metals (giant metal lattices)

Question 2

structure of diamond

Answer 2

tetrahedral arrangement of carbon atoms.
4 covalent bonds per atom

Question 3

structure of graphite

Answer 3

planar arrangement of carbon atoms in layers.
3 covalent bonds per atom in each layer.
4th outer electron per atom is delocalised.
delocalised electrons between layers

Question 4

why do macromolecular (giant covalent) structures have high melting points?

Answer 4

strong covalent forces in the giant structure.
it takes a lot of energy to break the many strong covalent bonds

Question 5

structure of metals

Answer 5

close packing ions
delocalised electrons