The Language of Chemistry: Classification and Nomenclature of Compounds

Classification of Chemical Compounds

Introduction to Chemical Compounds

Chemical compounds are substances formed from two or more elements chemically bonded together. In chemistry, compounds are broadly classified as organic or inorganic based on the presence of carbon atoms.

• Inorganic compounds generally do not contain the element carbon. Exceptions include carbon monoxide (CO), carbon dioxide (CO2), and carbonates (which contain the ion CO32−).

• Organic compounds do contain carbon, such as glucose (C6H12O6).

Common Classes of Inorganic Compounds

Inorganic compounds and acids are commonly divided into five classes:

• Binary ionic compounds (contain two elements: a metal and a nonmetal)

• Ternary ionic compounds (contain three elements, typically a metal, a nonmetal, and oxygen)

• Binary molecular compounds (contain two nonmetals)

• Binary acids (aqueous solutions of hydrogen and a nonmetal)

• Ternary oxyacids (aqueous solutions of hydrogen, oxygen, and another nonmetal)

Binary means "two" and ternary means "three" elements.

Classification Diagram

The following diagram summarizes the classification of inorganic compounds and acids:

INORGANIC COMPOUNDS and ACIDS
Ionic - Binary ionic compound - Ternary ionic compound	Molecular - Binary molecular compound	Aqueous acid - Binary acid - Ternary oxyacid

Nomenclature: The Language of Chemistry

IUPAC and Chemical Naming

The International Union of Pure and Applied Chemistry (IUPAC) has established systematic rules for naming chemical compounds. These rules ensure that each compound has a unique and universally understood name.

• IUPAC stands for International Union of Pure and Applied Chemistry.

• Systematic naming helps avoid confusion and ensures clear communication among chemists worldwide.

Summary Table: Classes of Inorganic Compounds

Class	Elements Involved	Example
Binary ionic	Metal + Nonmetal	NaCl (sodium chloride)
Ternary ionic	Metal + Nonmetal + Oxygen	KNO3 (potassium nitrate)
Binary molecular	Nonmetal + Nonmetal	CO2 (carbon dioxide)
Binary acid	Hydrogen + Nonmetal (in aqueous solution)	HCl(aq) (hydrochloric acid)
Ternary oxyacid	Hydrogen + Oxygen + Nonmetal (in aqueous solution)	HNO3(aq) (nitric acid)

Key Terms

• Compound: A substance formed when two or more elements are chemically bonded together.

• Organic compound: Contains carbon atoms, usually bonded to hydrogen, oxygen, or other carbons.

• Inorganic compound: Generally does not contain carbon (with some exceptions).

• Binary: Composed of two different elements.

• Ternary: Composed of three different elements.

• Acid: A substance that produces hydrogen ions (H+) in aqueous solution.

Example: Classification of Glucose

• Glucose (C6H12O6) is an organic compound because it contains carbon.

Additional info:

• Further sections of the notes (not shown in the images) likely cover detailed rules for naming each class of compound, including the use of prefixes, suffixes, and the handling of polyatomic ions.