Untitled Deck Flashcards
(9 cards)
What are substances that consist of giant covalent structures?
Solids with very high melting points
They include diamond, graphite, and silicon dioxide.
What type of bonds link the atoms in giant covalent structures?
Strong covalent bonds
These bonds must be overcome to melt or boil these substances.
Name three examples of giant covalent structures.
- Diamond
- Graphite
- Silicon dioxide (silica)
These materials exhibit unique physical properties due to their bonding.
How many covalent bonds does each carbon atom form in diamond?
4 covalent bonds
This structure contributes to diamond’s hardness and high melting point.
What are the properties of diamond?
- Very hard
- Very high melting point
- Does not conduct electricity
Diamond’s properties are a result of its giant covalent structure.
How many covalent bonds does each carbon atom form in graphite?
3 covalent bonds
This leads to the formation of layers within the structure.
What is the structure of graphite?
Layers of hexagonal rings with no covalent bonds between the layers
This allows for the layers to slide over each other, giving graphite its lubricating properties.
What is unique about the electrons in graphite?
One electron from each carbon atom is delocalised
This delocalisation allows electrons to move freely and carry charge throughout the structure.
