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Chemistry - Wikipedia
https://en.wikipedia.org/wiki/Chemistry
WebChemical substances are classified in terms of their structure, phase, as well as their chemical compositions. They can be analyzed using the tools of chemical analysis, e.g. spectroscopy and chromatography. Scientists engaged in chemical research are known as chemists. Most chemists specialize in one or more sub-disciplines.
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Chemical substance - Wikipedia
https://en.wikipedia.org/wiki/Chemical_substance
WebA chemical substance is a unique form of matter with constant chemical composition and characteristic properties. 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.
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What Is a Chemical? Definition and Examples - Science Notes …
https://sciencenotes.org/what-is-a-chemical-definition-and-examples/
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 a 2:1 ratio.
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Chemical reaction | Definition, Equations, Examples, & Types
https://www.britannica.com/science/chemical-reaction
WebApr 16, 2024 · A chemical reaction is a process in which one or more substances, also called reactants, are converted to one or more different substances, known as products. Substances are either chemical elements or compounds. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products. The …
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Chemical Definition & Meaning - Merriam-Webster
https://www.merriam-webster.com/dictionary/chemical
WebThe meaning of CHEMICAL is of, relating to, used in, or produced by chemistry or the phenomena of chemistry. How to use chemical in a sentence.
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Chemistry | Definition, Topics, Types, History, & Facts
https://www.britannica.com/science/chemistry
Web5 days ago · Chemistry, 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. Chemistry is concerned with the properties of atoms and the laws governing their combinations.
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Chemical compound | Definition, Examples, & Types | Britannica
https://www.britannica.com/science/chemical-compound
WebMar 11, 2024 · Chemical 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.
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CHEMICAL | English meaning - Cambridge Dictionary
https://dictionary.cambridge.org/dictionary/english/chemical
WebCHEMICAL definition: 1. any basic substance that is used in or produced by a reaction involving changes to atoms or…. Learn more.
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PubChem
https://pubchem.ncbi.nlm.nih.gov/
WebSearch and explore chemical information in the world's largest free chemistry database. 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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Chemistry library | Science | Khan Academy
https://www.khanacademy.org/science/chemistry
WebChemistry is the study of matter and the changes it undergoes. Here you can browse chemistry videos, articles, and exercises by topic. We keep the library up-to-date, so you may find new or improved material here over time.
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Chemical compound - Wikipedia
https://en.wikipedia.org/wiki/Chemical_compound
WebA chemical compound is a chemical substance composed of many identical molecules (or molecular entities) containing atoms from more than one chemical element held together by chemical bonds. A molecule consisting of atoms of …
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Periodic Table of Elements - PubChem
https://pubchem.ncbi.nlm.nih.gov/periodic-table/
WebInteractive periodic table with up-to-date element property data collected from authoritative sources. Look up chemical element names, symbols, atomic masses and other properties, visualize trends, or even test your elements knowledge by playing a periodic table game!
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Chemical Definition - Chemistry Glossary - ThoughtCo
https://www.thoughtco.com/definition-of-chemical-604406
WebMay 8, 2019 · Anything consisting of matter is a chemical. Any liquid, solid, gas. A chemical includes any pure substance; any mixture. Because this definition of a chemical is so broad, most people consider a pure substance (element or compound) to be a chemical, particularly if it is prepared in a laboratory.
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CHEMICAL | definition in the Cambridge English Dictionary
https://dictionary.cambridge.org/us/dictionary/english/chemical
Webnoun [ C ] us / ˈkem.ɪ.k ə l / uk / ˈkem.ɪ.k ə l /. Add to word list. Add to word list. B2. any basic substance that is used in or produced by a reaction involving changes to atoms or …
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CHEMICAL Definition & Meaning | Dictionary.com
https://www.dictionary.com/browse/chemical
WebChemical definition: a substance produced by or used in a chemical process.. See examples of CHEMICAL used in a sentence.
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Chemical element | Definition, Origins, Distribution, & Facts
https://www.britannica.com/science/chemical-element
Webchemical element, any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which all matter is composed. This article considers the origin of the elements and their abundances throughout the universe.
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Molecules and compounds - Khan Academy
https://www.khanacademy.org/science/chemistry/atomic-structure-and-properties/introduction-to-compounds/a/paul-article-2
WebMolecules and compounds. Google Classroom. Compounds can be classified as ionic or covalent. Molecules are the simplest unit of a covalent compound, and molecules can be represented in many different ways. Atoms are the smallest units of matter that still retain the fundamental chemical properties of an element.
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What Is and Is Not a Chemical? - ThoughtCo
https://www.thoughtco.com/what-is-a-chemical-604316
WebDec 7, 2019 · A chemical is any substance consisting of matter. This includes any liquid, solid, or gas. A chemical is any pure substance (an element) or any mixture (a solution, compound, or gas). They can either occur naturally or can be created artificially.
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What is a Chemical ? | NRC.gov
https://www.nrc.gov/reading-rm/basic-ref/students/science-101/what-is-a-chemical.html
WebMar 19, 2020 · A chemical is any substance that has a defined composition. In other words, a chemical is always made up of the same "stuff." Some chemicals occur in nature, such as water. Other chemicals are manufactured, such as chlorine (used for bleaching fabrics or in swimming pools).
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Elements, Chemicals and Chemistry - ChemicalAid
https://www.chemicalaid.com/
WebElements, Chemicals and Chemistry. Get detailed information about chemistry and the elements. Solve problems easily using our calculators and solvers.
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ChemSpider | Search and share chemistry
https://chemspider.com/
WebSystematic Name, Synonym, Trade Name, Registry Number, SMILES, InChI or CSID. What is ChemSpider? ChemSpider is a free chemical structure database providing fast text and structure search access to over 100 million structures from hundreds of data sources. Search by chemical names.
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Chemical formula | Definition, Types, Examples, & Facts
https://www.britannica.com/science/chemical-formula
WebMar 8, 2024 · Chemical formula, any of several kinds of expressions of the composition or structure of chemical compounds. The forms commonly encountered are empirical, molecular, structural, and projection formulas. An empirical formula consists of symbols representing elements in a compound, such as Na for.
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Chemical Engineering Journal | ScienceDirect.com by Elsevier
https://www.sciencedirect.com/journal/chemical-engineering-journal
WebThe Chemical Engineering Journal focuses upon five aspects of chemical engineering: catalysis, chemical reaction engineering, environmental chemical engineering, green and sustainable science and engineering, and novel materials. The Chemical Engineering Journal is an international research journal and invites contributions of original and ...
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