A bond between a metal and a non metal - the sharing of a pair of electrons between two atoms
1 of 16
Are the melting and boiling points of Giant Covalent Structures high or low? Why?
They are very high because all of the strong covalent bonds need to be broken for the structure to change form
2 of 16
Are the melting and boiling points of Simple Covalent Structures low or high? Why
They are low because it is the weak intermolecular bonds being broken rather than the strong covalent bonds
3 of 16
Do Covalent Structures conduct electricity?
Usually no because there are no free electrons
4 of 16
Do Giant Covalent Structures dissolve in water?
No, the covalent bonds are stronger than the ions attraction to the water molecules
5 of 16
Do Simple Covalent Structures dissolve in water?
Since the intermolecular bonds are much weaker most simple covalent structures dissolve in water however some are still insoluble
6 of 16
What is an Allotrope?
A different form of the same element
7 of 16
Name three Allotropes of Carbon
Diomand, Graphite and Fullerenes
8 of 16
In diamond, how many other atoms is one atom bonded to?
Each carbon atom is bonded to 4 other carbon atoms
9 of 16
What are the properties of diamond?
Extremely hard, has a very high melting point, doesn't conduct electricity
10 of 16
In graphite, how many other atoms is one atom bonded to?
3 other carbon atoms, creating a layered structure
11 of 16
What are the properties of Graphite?
Soft, Slippery, Good conductor of electricity
12 of 16
Why is Graphite soft and slippery?
When an atom only bonds to 3 other atoms one electron is left spare. These electrons become delocalised and are found between the layers of the structure. These intermolecular forces hold the layers together and aren't as strong as covalent bonds.
13 of 16
(Continued)
This means the layers can slide over each other making graphite soft and slippery
14 of 16
Why can Graphite conduct electricity?
The delocalised electrons allow graphite to conduct an electrical charge as the electrons can move to the positive terminal
15 of 16
What are fullerenes?
A group of molecules made up of differing numbers of atoms. They exist as a cage-like or tubular structure. They are not giant covalent structures.
16 of 16
Other cards in this set
Card 2
Front
Are the melting and boiling points of Giant Covalent Structures high or low? Why?
Back
They are very high because all of the strong covalent bonds need to be broken for the structure to change form
Card 3
Front
Are the melting and boiling points of Simple Covalent Structures low or high? Why
Comments
No comments have yet been made