1. Energy

2. Carbon Atomic number : 6 Group: IV Most common isotope: C12
Electron configuration: 2,4
Bonding: covalent

3. Allotropes
Allotropes are forms of the same element (in the same physical state) which have distinctly different physical properties (eg: colour, density, hardness)
Diamond and graphite are allotropes of carbon.
Allotropes have different physical properties because the atoms are joined in different ways to form molecules or crystals

4. Diamond Covalent network structure
Carbon atoms are arranged in the shape of a tetrahedron
One carbon atom in the centre surrounded by four other carbon atoms
Each carbon atom shares a pair of electrons with four other carbon atoms
Covalent bonds

5. Graphite Carbon atoms are arranged in flat parallel layers.
Dispersion forces
Carbon atoms are arranged in
flat parallel layers.
Each carbon atom is covalently
bonded to three other atoms
forming hexagonal rings
The fourth electron is delocalised
The strong covalent bonds hold the carbon atoms together in the rings, however, bonding between layers is relatively weak and consists of dispersion forces

6. Bonding in carbon compounds
In organic compounds carbon atoms almost always
form four bonds. These may be:
Single bonds eg: methane
Double bonds eg: ethene

7. Bonding in carbon compounds
Triple bonds eg: ethyne

8. Representing structures
The bonding and structure of carbon compounds can
be represented by ball and stick, electron dot diagrams,
structural formula etc.
The following diagram
represents the three
dimensional structure of
the compounds.

9. Hydrocarbons Compounds that contain only carbon and hydrogen.
Aliphatic hydrocarbons have either straight chain or branched chain structures and include:
- alkanes: all the bonds are single bonds
- alkenes: contain a carbon-carbon double bond
- alkynes: contain a carbon-carbon triple bond

10. Nomenclature
The name for a carbon compound consists of a stem which tells us the number of carbon atoms in the chain and a suffix that tells us the family the compound belongs to (alkane, alkene, alkyne)

11. What are the names and formula of each of these alkanes?
When naming take the usual stem name to indicate the number of carbon atoms in the chain and then add the suffix ‘ane’
Structural formula CnH2n+2
What are the names and formula of each of these alkanes?

12. Alkenes Structural formula CnH2n When naming:
1. Take the usual stem name to indicate the number of carbon atoms in the chain and then add the suffix ‘ene’
2. Show the location of the double bond by putting in front of the name the number of the carbon atom at which the double bond starts
3. Begin numbering the carbon chain from the end of the molecule that minimises the number for the double bond
Structural formula CnH2n

13. Example
1. Number of atoms in the chain = 4 therefore the stem name is ‘but’
2. Putting in front of the name the number of the carbon atom at which the double bond starts – remembering to begin numbering the carbon chain from the end
of the molecule that minimises the number for the double bond
Start numbering at this end

14. Isomers
Alkenes containing more than 4 carbon atoms may have different structures. For example:
This is called structural isomerism.
Isomers have the same molecular formula but the atoms in the molecule are arranged differently