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What Is a Chemical? Definition and Examples - Science Notes and Projects
A chemical is any substance with a definite composition and distinct properties. All matter is made of chemicals, regardless of whether it is natural or synthetic.

PubChem
Search and explore chemical information in the world's largest free chemistry database. Search chemicals by name, molecular formula, structure, and other identifiers.

Chemistry - Wikipedia
Chemical reactions usually involve the making or breaking of chemical bonds. Oxidation, reduction, dissociation, acid–base neutralization and molecular rearrangement are some examples of common chemical reactions.

ChemicalBook
ChemicalBook是一家致力于为化学行业用户提供最有价值信息的资源平台，在这里可以使用中文名称，CAS号，英文名称，分子式，分子量，MDL号，EINECS号，结构式等多种方式检索日常工作中需要的化学品信息资源（熔点，沸点，MSDS，结构式，折射率，安全信息，危险品数据，化学性质，用途，合成方法 ...

Substance (chemistry) - Wikipedia
In chemistry, a 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.

CHEMICAL Definition & Meaning - Merriam-Webster
The 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.

ChemicalBook
Here you can get chemical information (such as chemical physical properties, safety data, Excellent china suppliers and their web addresses and etc.)by searching the name, CAS number, molecular formula, molecular weight, MDL number, EINECS number, structure.

CHEMICAL | English meaning - Cambridge Dictionary
CHEMICAL definition: 1. any basic substance that is used in or produced by a reaction involving changes to atoms or…. Learn more.

Chemical reaction | Definition, Equations, Examples, & Types - Britannica
Substances are either chemical elements or compounds. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.

American Chemical Society
Turn scientific knowledge into action Champion science, inform public policy, and help shape a stronger future for the chemical sciences.

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