L7.5 - Metallic Compounds

Question 1

What is a metallic compound?

Answer 1

metal + metal

Question 2

What is the structure of metallic compounds?

Answer 2

a lattice of positive ions existing in a ‘sea’ of outer delocalised electrons

Question 3

What are the properties of metallic compounds?

5

Answer 3

high melting/boiling points

can conduct electricity + heat

malleable

ductile

Question 4

Why do metallic compounds have high melting/boiling points?

Answer 4

Strong attraction between metal Ions + delocalised sea of electrons meaning lots of energy needed to weaken or break

Question 5

Why can metallic compounds conduct electricity?

Answer 5

delocalised electrons can move throughout structure

meaning an electron from the negative terminal of the supply joins the electron sea at one end of the metal wire whilst at the same time a different electron leaves the wire at a positive terminal

Question 6

Why can metallic compounds conduct heat?

Answer 6

they have high thermal conductivities because the energy is spread by increasing vigorous vibrations of the closely packed ions

Question 7

Why are metallic compounds malleable + ductile?

Answer 7

after small distortion, each metal ion still in same environment

Question 8

what does malleable mean?

Answer 8

they can be beaten into shape

Question 9

what does ductile mean?

Answer 9

they can be pulled into thin wires