Aromatics: 

Aromatics are types of hydrocarbons derived from petroleum, characterized by one or more six-carbon rings (benzene rings) molecular structure and 'sweet' or aromatic odor
Benzene, toluene, and xylenes are the most common aromatics, and are extensively used in the chemical industry as chemical feedstocks, solvents, and as additives to gasoline to raise its octane rating

Chemicals:

Chemicals are substances formed by chemical union of two or more elements or ingredients in definite proportion by weight. They are produced by or used in a reaction involving changes in atoms or molecules.
Generally, "chemicals" refers to a much wider class of substances that includes many mixtures of chemical substances that often find application in many vocations.
There are two major types of chemicals:
• Inorganic Chemicals are compounds that do not contain hydrocarbon groups.
• Organic Chemicals are compounds containing hydrocarbon groups.
Chemicals are used to make a wide variety of consumer goods, as well as thousands inputs to agriculture, manufacturing, construction, and service industries.

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