Chemical substance - Wikipedia
WEBA chemical substance is a unique form of matter with constant chemical composition and characteristic properties. [1] [2] Chemical substances may take the form of a single element or chemical compounds. If two or more chemical substances can be combined without reacting, they may form a chemical mixture. [3]
What Is a Chemical? Definition and Examples - Science Notes and …
WEBOct 15, 2023 · A chemical is a substance with a specific composition. It is an element, an alloy, or a compound made up of two or more elements combined in a fixed ratio. For instance, water (H 2 O) is a chemical because it consists of hydrogen and oxygen combined in …
PubChem
WEBPubChem 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.
Chemical compound | Definition, Examples, & Types | Britannica
WEBChemical compound, any substance composed of identical molecules consisting of atoms of two or more chemical elements. All the matter in the universe is composed of the atoms of more than 100 different chemical elements, which are found both in pure form and combined in chemical compounds.
Chemistry | Definition, Topics, Types, History, & Facts
WEBChemistry, the science of the properties, composition, and structure of substances (defined as elements and compounds), the transformations they undergo, and the energy that is released or absorbed during these processes.
Chemical element | Definition, Origins, Distribution, & Facts
WEBA chemical element is any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which all matter is composed. Learn more about the origins, distribution, and characteristics of chemical elements in this article.
3.1: Types of Chemical Compounds and their Formulas
WEBJul 12, 2023 · There are two fundamentally different kinds of chemical bonds (covalent and ionic) that cause substances to have very different properties. The composition of a compound is represented by an empirical or molecular formula, each consisting of at least one formula unit.Contributors
1.2: Basic Definitions - Chemistry LibreTexts
WEBJun 23, 2022 · Substance. A sample of matter that has the same physical and chemical properties throughout is called a substance. Sometimes the phrase pure substance is used, but the word pure isn't needed.
What is a Chemical Substance? | Beyond Chemistry | Stahl
WEBChemical substances can be single chemical molecules, like water, or mixtures of different chemicals. Air is a mixture nitrogen, oxygen, water, carbon dioxide + other chemicals. Living organisms, like plants & animals, consist entirely of chemicals.
1.2 The Classification of Matter - ChemicalAid
WEBAny sample of matter that has the same physical and chemical properties throughout the sample is called a substance. There are two types of substances. A substance that cannot be broken down into chemically simpler components is an element. Aluminum, which is used in soda cans, is an element.
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