Structure & Bondig

Structure and bonding

Can a giant ionic lattice conduct electricity?

No this is due to the strong electrostatic forces of attraction which lock the ions in place.

However when melted or dissolved in water these ionic bonds are broken and the ions can carry a charge as they are free to move.

Why do Giant ionic lattice have high melting and boiling points?

Due to the strong electrostatic forces of attraction , a great deal of heat energy is needed to break them.

Do small molecules have high melting and boiling points?

No, this is because they have weak intermolecular forces which do not require a great deal of heat energy to break

Does diamond conduct electricity?

No this is because diamond is made up of carbon atoms and each carbon atom is covalently bonded to 4 other carbon atoms. This means all of the outer electrons are in covalent bonds and there are no free electrons to carry a charge.

Why does graphite have a high boiling point?

Graphite contains a lot of covalent bonds which will require a lot of energy to break

Why is graphite soft and slippery?

The hexagonal rings of graphite are arranged into layers with no covalent bonds between them. This means the layers can slide over each other.

Why does graphite conduct electricity?

Graphite is made up of carbon atoms and each carbon atoms are covaelntly bonded to only 3 other carbon atoms. Therefore there is one more electron on the outermost shell that is not in a covaelnt bond. These electrons are released becoming delocalised electrons so they can carry a charge around the structure.

Why does the boiling point increase as you go down group 7?

-Molecules get bigger as you go down the group

-Bigger molecules=more intermolecular forces between the different molecules

-More energy is required to break all of them

What are the properties of carbon nanotubes

High tensile strenght -able to apply a great deal of stretching force before it breaks.

Good conductor of electricity -they have delocalised electrons

What are the uses of fullerenes?

-Deliver drugs into the body -Catalyst to speed up chemical reactions -lubricant in machines