Structure 2.3

Question 1

Is the process of removing valence electrons endothermic or exothermic

Answer 1

Endothermic, however the energy required is relatively low when compared to non-metals.

Question 2

Metallic bonding

Answer 2

the electrostatic attraction between a lattice of cations and delocalised electrons

Question 3

Electrical conductivity

Answer 3

The ability to carry electrical charge. Due to the movement of charged particles.

Question 4

Why are metals good conductors

Answer 4

The delocalised electrons are free to carry the charge. They have low electrical resistance.

Question 5

Does a chemical change take place when a metal conducts electricity

Answer 5

no

Question 6

Melting points of metals

Answer 6

They have high melting points which suggests that metallic bonding is quite strong.

Question 7

What does the strength of a metallic bond depend on?

Answer 7

The number of delocalised electrons, the charge on the cation and the radius of the cation.

Question 8

How does the size of the cation change the strength of a metallic bond?

Answer 8

The larger the cation the weaker the bond bc the attraction between the cations and electrons decreases.

Question 9

Strength of a metallic bond down a group

Answer 9

Decreases

Question 10

Strength of a metallic bond across a period

Answer 10

Increases, as the charge on the cation is increasing and the radius of it is decreasing

Question 11

Malleable

Answer 11

Can be shaped under pressure

Question 12

Ductile

Answer 12

Can be drawn into a wire

Question 13

Why are metals malleable and ductile?

Answer 13

The layers of cations can slide over each other without breaking. The movement of the delocalised electrons is non-directional and random throughout the lattice

Question 14

Why are metals shiny?

Answer 14

Delocalised electrons in metal crystal structures reflect light

Question 15

Why are metals good thermal conductors?

Answer 15

The delocalised electrons are free to move and closely packed ions enable efficient transfer of thermal energy.