Chemical substance - Wikipedia

A chemical substance is a unique form of matter with constant chemical composition and characteristic properties. Learn about the definition, types, examples, and history of chemical substances in different fields of chemistry.

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PubChem

PubChem is the world's largest collection of freely accessible chemical information. Search chemicals by name, molecular formula, structure, and other identifiers. Find chemical and physical properties, biological activities, safety and toxicity information, patents, literature citations and more.

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What Is a Chemical? Definition and Examples - Science Notes and Projects

Learn what a chemical is and how to identify it based on its composition, properties, and reactions. Explore the role of chemicals in medicine, food, environment, and more.

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What Is a Chemical and What Isn't a Chemical? - ThoughtCo

Learn the definition of a chemical and examples of natural and artificial chemicals. Find out how chemicals affect our daily lives and the environment.

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What is a Chemical - NRC

Learn the definition of a chemical, the difference between physical and chemical changes, and the law of conservation of mass. See examples of chemical reactions and how to identify them.

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Chemistry | Definition, Topics, Types, History, & Facts | Britannica

Plastics are a prime example, as are many drugs and agricultural chemicals. A continuing challenge for synthetic chemists is the structural complexity of most organic substances. To synthesize a desired substance, the atoms must be pieced together in the correct order and with the proper three-dimensional relationships.

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Chemicals, Pesticides and Toxics Topics | US EPA

Find information about chemicals, pesticides and toxics regulated by the US Environmental Protection Agency (EPA). Learn how to protect yourself and the environment from harmful substances and access databases and resources.

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10 Types Of Chemicals and How to Manage Them - Occupational Health and ...

Chemicals are the backbone of countless industries—from manufacturing and agriculture to healthcare and research. However, with their widespread use comes the inevitable risk of chemical hazards that can seriously affect human health and the environment. Whether you’re a safety officer, lab technician, factory worker, or employer ...

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Chemistry - Wikipedia

Chemistry is the study of matter and its properties, structure, behavior and reactions. Learn about the history, branches, concepts and applications of chemistry, from atoms and elements to compounds and reactions.

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Chemical compound | Definition, Examples, & Types | Britannica

Water, which is a chemical compound of hydrogen and oxygen in the ratio two hydrogen atoms for every oxygen atom, contains H 2 O molecules. Sodium chloride is a chemical compound formed from sodium (Na) and chlorine (Cl) in a 1:1 ratio. Although the formula for sodium chloride is NaCl, the compound does not contain actual NaCl molecules. Rather, it contains equal numbers of sodium ions with a ...

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Chemical substance

A chemical substance is a unique form of matter with constant chemical composition and characteristic properties. Learn about the definition, types, examples, and history of chemical substances in different fields of chemistry.

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