7.3 Bonding and structure

Question 1

what is metallic bonding?

Answer 1

strong electrostatic force of attraction between positively charged metal ions and delocalised electrons

Question 2

what structure is produced by metallic bonding?

Answer 2

a giant metallic lattice

Question 3

what are the properties of metals?

Answer 3

strong metallic bonds
high electrical conductivity
high melting and boiling points

Question 4

why can metals conduct electricity?

Answer 4

metals contain delocalised electrons which are free to move and can carry a charge

Question 5

why do metals have a high melting point?

Answer 5

high temperatures are needed to provide energy to overcome the strong metallic bonds

Question 6

how soluble are metals?

Answer 6

they are insoluble

metallic bonds are too strong to be broken

Question 7

what is a covalent bond?

Answer 7

strong electrostatic force of attraction between a shared pair of electrons and the nuclei

Question 8

what giant structure is composed of covalent bonds?

Answer 8

giant covalent lattice

Question 9

why do giant covalent structures have high melting and boiling points?

Answer 9

covalent bonds are very strong and require a lot of energy to overcome

Question 10

how soluble are giant covalent lattices?

Answer 10

insoluble

covalent bonds too strong to be broken by solvent interactions

Question 11

what giant covalent structures can conduct electricity and why?

Answer 11

graphite and graphene can

it is a type of carbon which only uses 3 of it’s 4 electrons for covalent bonding

the 4th electron becomes delocalised so it can move and carry a charge

Question 12

what is the trend in melting points across periods

Answer 12