4. Fossil fuels such as coal, petroleum,
and natural gas.
This is because fossil fuels are
themselves formed from remains of
dead organism.

5. Carbon has four valence electrons
which means that each carbon
atom can form bonds with four
other atoms.

6. Because of its position on the
Periodic Table, most of the bonds
that carbon forms with other atoms
are “covalent”

7. • Dot´s Lewis structures
• Structural formula
• Condensed structural formula
• Molecular formula

8. It is possible for two organic
compounds to have tha same
molecular formula but a different
structural formula.

9. In chemistry, isomers are molecules
with tha same molecular formula
and often with the same kinds of
chemical bonds between atoms,
but in which the atoms are
arranged differently.