There are three major categories of substances: mixtures, compounds, and elements.
The study of mixtures includes solutions and heterogenous mixtures including dispersions.
There are millions of known and potential chemical compounds; many of their properties are unknown, and only a few of the more important ones are considered here. Major categories include organic compounds and inorganic compounds.
An alphabetical list is included. Discussion of element classes and periodic groupings can be considered, and a version of the Periodic table of elements is included.
Early prehistory including Pliocene prehistory, early Pleistocene prehistory, early mid Pleistocene prehistory, mid Pleistocene prehistory, and late mid Pleistocene prehistory can be connected. Middle prehistory including the 5th decamillennium BP, 4th decamillennium BP, 3rd decamillennium BP, and 2nd decamillennium BP can be connected. Late prehistory including the 8th millennium BC, 7th millennium BC, 6th millennium BC, 5th millennium BC, and 4th millennium BC can be connected.
Observations of chemical substances in this period were non-scientific. The early 3rd millennium BC including the 30th century BC, 29th century BC, 28th century BC, 27th century BC, and 26th century BC can be connected. The late 3rd millennium BC including the 25th century BC, 24th century BC, 23rd century BC, 22nd century BC, and 21st century BC can be connected. The early 2nd millennium BC including the 20th century BC, 19th century BC, 18th century BC, 17th century BC, and 16th century BC can be connected. The late 2nd millennium BC including the 15th century BC, 14th century BC, 13th century BC, 12th century BC, and 11th century BC can be connected. The early 1st millennium BC including the 10th century BC, 9th century BC, 8th century BC, 7th century BC, and 6th century BC can be connected.
Early classical history including the 5th century BC, 4th century BC, 3rd century BC, 2nd century BC, and 1st century BC can be connected. Late classical history including the 1st century CE, 2nd century CE, 3rd century CE, 4th century CE, and 5th century CE can be connected. Early medieval history including the 6th century CE, 7th century CE, 8th century CE, 9th century CE, and 10th century CE can be connected. Late medieval history including the 11th century CE, 12th century CE, 13th century CE, 14th century CE, and 15th century CE can be connected.
The 16th century including the early 16th century, early mid 16th century, mid 16th century, late mid 16th century, and late 16th century can be connected. The 17th century including the early 17th century, early mid 17th century, mid 17th century, late mid 17th century, and late 17th century can be connected.
The 18th century including the early 18th century, early mid 18th century, and mid 18th century can be connected. The late mid 18th century including the early 1760s, late 1760s, early 1770s, and late 1770s can be connected. The late 18th century including the early 1780s, late 1780s, early 1790s, and late 1790s can be connected.
The 19th century including the early 19th century, early mid 19th century, mid 19th century, late mid 19th century, and late 19th century can be connected.
The early 19th century including the early 1800s, late 1800s, early 1810s, and late 1810s can be connected. The early mid 19th century including the early 1820s, late 1820s, early 1830s, and late 1830s can be connected. The mid 19th century including the early 1840s, late 1840s, early 1850s, and late 1850s can be connected. The late mid 19th century including the early 1860s, late 1860s, early 1870s, and late 1870s can be connected. The late 19th century including the early 1880s, late 1880s, early 1890s, and late 1890s can be connected.
The 20th century including the early 20th century, early mid 20th century, mid 20th century, late mid 20th century, late 20th century, and early 21st century can be connected.
The early 20th century including the early 1900s, late 1900s, early 1910s, and late 1910s can be connected. The early mid 20th century including the early 1920s, late 1920s, early 1930s, and late 1930s can be connected. The mid 20th century including the early 1940s, late 1940s, early 1950s, and late 1950s can be connected. The late mid 20th century including the early 1960s, late 1960s, early 1970s, and late 1970s can be connected. The late 20th century including the early 1980s, late 1980s, early 1990s, and late 1990s can be connected.
The early 21st century including the early 2000s, and late 2000s can be connected.
The future including the near future, middle future, and far future can be connected.
Sociology including peoples of the world, communities, and social structure and change can be connected.
Peoples of the world including nations and major groups of Western Civilization, Asiatic peoples, African peoples, and American Indian peoples can be connected.
Nations such as Russia, Bangladesh, Japan, Mexico, Philippines, Vietnam, Ethiopia, Egypt, Germany, Iran, Turkey, Congo DR, Thailand, France, United Kingdom, Italy, South Africa, South Korea, Burma, Colombia, Spain, Ukraine, Tanzania, Argentina, Kenya, Poland, Algeria, Canada, Iraq, Uganda, Morocco, Sudan, Peru, Uzbekistan, Malaysia, Venezuela, Saudi Arabia, Nepal, Yemen, Afghanistan, Ghana, North Korea, Mozambique, Taiwan, Australia, Syria, Côte d'Ivoire, Madagascar, Sri Lanka, Angola, Cameroon, Romania, Chile, Netherlands, Kazakhstan, Niger, Burkina Faso, Guatemala, Mali, Ecuador, Cambodia, Malawi, Zambia, Senegal, Zimbabwe, Chad, Cuba, Belgium, Greece, Rwanda, Tunisia, Portugal, Czech Republic, Bolivia, Guinea, Burundi, Haiti, Hungary, Somalia, Sweden, Belarus, Dominican Republic, Azerbaijan, Benin, Austria, can be connected.
Asiatic peoples such as those of Pakistan can be connected. South Asian peoples such as those of India can be connected. Oriental peoples such as those of China can be connected. Southeast Asian and Oceanic peoples such as those of Indonesia can be connected.
American Indian peoples such as those of Brazil can be connected. Middle American Indian peoples such as those of the southwestern United States can be connected. North American Indian peoples such as those of the United States can be connected.
Communities such as Tokyo, Seoul, Mexico City, New York City, Mumbai, Jakarta, Sao Paulo, Delhi, Shanghai, Manila, Karachi, Cairo, Beijing, Osaka, Canton, Moscow, Los Angeles, Calcutta, Dacca, Buenos Aires, Istanbul, Rio de Janeiro, Shenzhen, Lagos, Paris, Nagoya, Lima, Chicago, Kinshasa, Tianjin, Chennai, Bengaluru, London, Saigon, Donguan, Hyderabad, Chengdu, Lahore, Jonannesburg, can be connected.
Social change including particular changes and movements, social change factors, and social change processes can be connected. Social types including industrial societies, agrarian societies, horticultural societies, and hunting and gathering societies can be connected. Social structure including community and regional structure, class structure, institutional structure, cultural structure, and anthropological structure can be connected.
Religion including particular religions of the world, religious organization, religious practice, and religious belief can be connected. Government including particular governments, government activity, government structure, and law can be connected. Economics including economic systems, industries, and economic activity can be connected. Education including school systems, educational organization, cultural institutions, teaching, and research can be connected. Family studies including particular families, kinship, parenting, and marriage can be connected.
Behavioral culture including cultural events, recreation and entertainment, occupations, and customs can be connected. Conceptual culture including philosophy, applied science, mathematics, literature, graphic arts, and language can be connected. Material culture including miscellaneous artifacts, communications technology, transportation technology, clothing and dress, foodstuffs, building technology, and industrial technology can be connected.
Anthropology including particular groups, human geography, human ecology, physical anthropology, demography, and social foundations can be connected.
Particular groups can be connected. Human geography including Asian geography, European geography, African geography, North American geography, South American geography, and Oceanic geography can be connected. Human ecology including human effects on the environment, relations with other life forms, and environmental effects can be connected. Physical anthropology including human dispersion, racial variation, and human origins can be connected. Demography including population change, population size and structure, migration, death, and birth and fertility can be connected. Social foundations including social group behavior, social group types, social control, social interaction, and social presentation can be connected.
Personal studies including biography, psychology, and the human body can be connected.
Biography can be connected. Psychology including social psychology, personality, mental disorders, developmental psychology, behavior patterns, mind, and behavioral elements can be connected. The human body including form and appearance, disease, life cycle, body functions, and body systems can be connected.
Other science including biology, earth science, astronomy, chemistry, and physics can be connected.
Biology including biohistory, ecology, systematics, organism biology, cell biology, and molecular biology can be connected. Earth science including geohistory, physical geography, atmospheric science, hydrospheric science, and geology can be connected. Astronomy including galactic astronomy, stellar astronomy, and local astronomy can be connected. Other chemistry including chemical systems and chemical change can be connected. Physics including the structure of matter, quantum physics, relativity, electromagnetism, thermodynamics, and mechanics can be connected.
Created 22 Nov 2013 Last updated 22 Sep 2017