3.1.3 (b&s) metallic bonding

Question 1

what does a giant metallic lattice look like?

Answer 1

Question 2

what increases the melting point?

Answer 2

as the number of delocalised electrons increases, the strength of the metallic bond increases and the melting point increases

Question 3

the more energy needed to change state the ………….

Answer 3

stronger the bonding

Question 4

what does the size of the cation effect?

Answer 4

the strength of the bonding

the larger the cation the weaker the bonding

and so the lower the melting points

Question 5

melting points tend to ………… down the group for metals

Answer 5

down

Question 6

example:

explain, in terms of its structure and bonding, why titanium has a high melting point

Answer 6

titanium has strong, electrostatic forces of attraction between the delocalised electrons

Which requires a lot of energy to overcome

Question 7

are metals malleable and ductile?

Answer 7

yes

Question 8

define: malleable

define: ductile

Answer 8

malleable: can be shaped

ductile: can be drawn into wires

Question 9

example:

and can be hammered into objects with different shapes that have similar strengths.

Suggest why titanium can be hammered into different shapes

Answer 9

the layers can slide over each other

Question 10

are metals good thermal conductors and electrical conductors?

Answer 10

metals are good, thermal conductors as the delocalised electrons can pass kinetic energy to each other

metals are good electrical conductors because the delocalised electrons are free to move through the metal

Question 11

the greater the number of delocalised electrons per atom, the ……. conductivity of the metal will be

Answer 11

better