Covalent Bonds And structures Flashcards
Having a full outer shell gives atoms the electronic structure of ….
A noble gas
What is a covalent bond?
A shared pair of electrons. Each atom involved has to make enough covalent bonds to fill up its outer shell.
Giant covalent structures are known as …
Macromolecules
All atoms in a giant covalent structure are bonded to each other by..
Strong covalent bonds.
Do giant covalent structures conduct electricity?
No, not even when molten (apart from graphite).
Why do atoms only share electrons in their outer shells?
Both atoms feel like they have an outer shell.
In a diamond, how many carbon covalent bonds are formed?
Four, in a rigid giant covalent structure.
Diamond is what?
A rigid structure of carbon atoms . The hardest natural substance, used in drill tips.
What properties do giant covalent bonds pocess?
High melting and boiling points.
How many covalent bonds are formed in graphite?
3 , creating layers which slide over each other.
The layers in graphite are held together…
Loosely, because there are weak intermolecular forces between the layers.
Why is graphite a good conductor of electricity and heat even though it’s a non-metal?
Each carbon atom has one delocalised electron , allowing it to conduct heat and electricity.
What is silicon dioxide also known as?
Silica
The only difference between graphite and diamond is?
The difference in properties and the way there atoms are held together.
Atoms in simple molecular substances form….
Very strong covalent bonds, to form small molecules of several atoms.
