C3.7 Giant Covalent Structures (Finished)
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In giant covalent structures how are atoms held together?
They are bonded to each other by strong covalent bonds
Why do giant covalent structures have very high melting points?
A lot of energy is needed to break the covalent bonds between atoms
Do giant covalent structures conduct electricity?
No since they don’t contain charged particles. Appart from graphite which does
Describe the structure of diamond
Each carbon atom forms four covalent bonds in a very rigid giant covalent structure
Describe the structure of graphite
Each carbon atom forms three covalent bonds to create two layers of hexagons. Each carbon atom also has one free electron
What atoms is silicon dioxide made of?
Silicon and oxygen
What are the properties of giant covalent structures?
• They have high melting and boiling points • They are insolvable in water • They do not conduct electricity (appart from granite) • They are hard
Why can you write using graphite? (Pencil)
There aren’t any covalent bonds between the layers of graphite, so they are held together weakly being free to move over each other. One layer will slide off and stay on paper when you write with a pencil
Why does graphite conduct electricity and thermal energy?
Only three of each of carbon’s for outer electrons are in bonds so each carbon atom has one electron which is delocalised, making it free to move around and conduct energy
What are the free electrons of graphene called?
Delocalised electrons