going through book need to knows Flashcards
why are Graphite and buckminsterfullerene able to conduct electricity?
as they have delocalised electrons that are able to move around freely and conduct electricity.
Which out of graphite and buckminsterfullerene has a higher melting point?
Graphite would have a higher melting point as it has forces in between its layers as well while buckminsterfullerene just has the covalent bonds to break.
What qualities does a thermosetting polymer have?
It has strong cross-linking, which makes it rigid and not stretchy.
What qualities does a thermosoftening polymer have?
It is easy to mould, and it is flexible.
What qualities do simple molecular substances have?
They generally have a lower melting point and boiling point than polymers or ionic compounds.
When can ionic compounds conduct electricity?
When they are molten or in solution.
Why do covalent bonds have a higher melting point?
Because you have to break the strong covalent bonds, holding the atoms together.
What are the typical properties of a metal?
Good conductor of heat, high, melting point, malleable, crystal structure when solid
Why do metals normally have a high melting point?
Because a large amount of energy is needed to overcome the strong electrostatic attraction between the positive ions and the delocalised electrons.
how does the structure of the metal allow them to conduct electricity?
the delocalised electrons are free to move, so they carry a charge through the solid metal
