Organic Chemistry: Carbon, Hydrocarbons, and Petroleum Refining

Origins: Fossil fuels are derived from the remains of dead plants and animals that lived millions of years ago.
Formation Conditions: The conversion of organic matter into fossil fuels occurs underground under a set of highly specific "special conditions":
- High temperature.
- High pressure.
- Absence of oxygen ( $O_2$ ).
- Presence of microorganisms.
Classification by State of Matter:
- Solid: Coal is the primary solid fossil fuel.
- Liquid: Petroleum (also referred to as crude oil) is described as a sticky, smelly liquid mixture consisting of hundreds of different hydrocarbons.
- Gas: Natural gas, which consists primarily of methane ( $CH_4$ ).

Verbatim Definition: Hydrocarbons are organic compounds that contain only the elements hydrogen ( $H$ ) and carbon ( $C$ ).
Solubility: Hydrocarbons are characterized by being insoluble in water.

Purpose: Fractional distillation is employed to ensure the best use of petroleum by separating the complex mixture into simpler mixtures called "fractions."
Mechanism: The separation process is based on the different boiling points of the various hydrocarbons contained within the petroleum.
Fractions and Their Applications:
- Tars: These are collected during distillation but are noted as not being used for fuel.
- Naphtha: Extensively used in the chemical industry, specifically for the production of plastics.
- Jansen: Specified as a fraction used for aircraft (commonly understood as aviation fuel/kerosene).
- Paraffin: Utilized as a fuel source.
- Diesel Oil: Utilized specifically as fuel for diesel engines.
- Fuel Oil: Utilized as fuel for ships.
- Lubricating Oil: Used for the production of lubricants, wax, and polish. This fraction is explicitly categorized as not being a fuel.
- Bitumen: A heavy fraction used for industrial applications, including road surfacing and roofing.
- Comparison of Fuel vs. Non-Fuel: Fractions such as naphtha, lubricating oil, wax, and bitumen are primarily used for industrial and structural purposes rather than as combustible energy sources.