Himpunan Kimia Amerika Serikat (bahasa Inggris: American Chemical Society, diabreviasi menjadi ACS) adalah sebuah perkumpulan ilmiah yang berpusat di Amerika Serikat yang mendukung kegiatan penelitian di bidang kimia. Perkumpulan ini didirikan tahun 1876 di Universitas New York, dan sampai saat ini ACS memiliki lebih dari 164,000 anggota yang semuanya merupakan peneliti di bidang kimia, teknik kimia, atau bidang yang berhubungan dengan kimia. Perkumpulan ini merupakan perkumpulan ilmiah terbesar di dunia. Referensi Pranala luar ACS website ACS Publications website Chemical & Engineering News ACS Chemical Abstracts Service (CAS) International Year of Chemistry Diarsipkan 2011-10-08 di Wayback Machine. A Cauldron Bubbles: PubChem and the American Chemical Society (Information Today, June 2005) ACS Chemical Biology WIKI Diarsipkan 2012-07-29 di Wayback Machine. ACS Chemical Biology Community Diarsipkan 2012-07-29 di Wayback Machine. ACS Green Chemistry Institute

Low-mass dense cores represent the state of molecular gas associated with the earliest phases of low-mass star formation. Such cores are called "protostellar" or "starless," depending on whether they do or do not contain compact sources of luminosity. In this chapter, the first half of the review of low-mass dense cores, we describe the numerous inferences made about the nature of starless cores as a result of recent observations, since these reveal the initial conditions of star formation. We focus on the identification of isolated starless cores and their internal physical and chemical properties, including morphologies, densities, temperatures, kinematics, and molecular abundances. These objects display a wide range of properties since they are each at different points on evolutionary paths from ambient molecular cloud material to cold, contracting, and centrally concentrated configurations with significant molecular depletions and, in rare cases, enhancements.

A chemical element is a chemical substance whose atoms all have the same number of protons. The number of protons is called the atomic number of that element. For example, oxygen has an atomic number of 8, meaning each oxygen atom has 8 protons in its nucleus. Atoms of the same element can have different numbers of neutrons in their nuclei, known as isotopes of the element. Two or more atoms can combine to form molecules. Some elements are formed from molecules of identical atoms, e. g. atoms of hydrogen (H) form diatomic molecules (H2). Chemical compounds are substances made of atoms of different elements; they can have molecular or non-molecular structure. Mixtures are materials containing different chemical substances; that means (in case of molecular substances) that they contain different types of molecules. Atoms of one element can be transformed into atoms of a different element in nuclear reactions, which change an atom's atomic number. Historically, the term "chemical element" meant a substance that cannot be broken down into constituent substances by chemical reactions, and for most practical purposes this definition...

This page presents several chemical infoboxes to present chemical compound data in a standardised form. They are to be used on all chemical articles, and as such are actively being used in the WikiProject Chemicals. Reliability of data These tables are constructed by experts in the field of chemical sciences, as well as amateurs and may have been edited by less-knowledgeable passers-by or vandals. Although these tables are well designed, and useful to present the relevant chemical data, the accuracy of information they contain cannot be guaranteed. This also applies to the information in the Hazards section, which is provided for reference value only. When handling chemicals, always take the proper precautions as defined also by reliable sources of information, particularly safety data sheets (SDSs) supplied by the manufacturer and/or relevant government agency. Also see Wikipedia:General disclaimer. All data as presented in these tables are for materials...

Chemical Entities of Biological Interest (ChEBI) is a freely available dictionary of molecular entities focused on 'small' chemical compounds.

A chemical peel is a technique used to improve and smooth the texture of the skin. Facial skin is mostly treated, and scarring can be improved. Chemical peels are intended to remove the outermost layers of the skin. To accomplish this task, the chosen peel solution induces a controlled injury to the skin. Resulting wound healing processes begin to regenerate new tissues. The dead skin eventually peels off. The regenerated skin is usually smoother and less wrinkled than the old skin. Some types of chemical peels can be purchased and administered without a medical license; however, people are advised to seek professional help from a dermatologist or plastic surgeon on a specific type of chemical peel before a procedure is performed. Types There are several types of chemical peels. α-hydroxy acid peels Alpha hydroxy acids (AHAs) are naturally occurring carboxylic acids such as glycolic acid, a natural constituent of sugar cane juice, and lactic acid, found in sour milk and tomato juice as well as being produced endogenously during...

A compilation of kinetics data on gas-phase chemical reactions

Four workers died after inhaling toxic fumes following a gas leak at a chemical plant at Dahej in Gujarat's Bharuch district, police said on Sunday.