I have decided to post the answer to last week questions because of 1 student. She is the only who ask me for the answer and therefore I decided to post the answer today.
Answers for last Sunday chemistry questions:
a) Iron has a giant metallic structure in which a lattice of positive ions and delocalised electrons are bound together by strong metallic bonds. A large amount of energy is needed to overcome the strong metallic bonds hence iron has a high melting and boiling point.
b) Aluminium has a giant metallic structure in which a lattice of positive ions and delocalised electrons are bound together by strong metallic bonds. The layers of positive ions can slide pass each other without breaking metallic bonds.
c) Copper has a giant metallic strucutre in which a lattice of positive ions is surrounded by a sea of mobile electrons. The presence of the sea of mobile electrons acts as mobile charged carriers which enable copper to conduct electricity.
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