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Physical Realm
Physical Laws (Constants) Relativity
Matter Molecule, Atom (Periodic Table), Particle
Force Gravity, Electromagnetism (Light, Color)


These are organized by a classification scheme developed exclusively for Cosma. More…



Chemistry Subject Guide (Library of Congress)
Chemistry Resources (Library of Congress)

Chemistry Subject Primer (National Network of Libraries of Medicine)
Chemistry Subject Guide (University of Virginia Libraries)
Links for Chemists (University of Liverpool‎)

American Chemical Society
Royal Society of Chemistry

Chemistry World
WWW Chemistry Guide
Chemistry Place (Infoplease)
Chemistry (National Science Digital Library)

Chemistry Center (Martindale’s Reference Desk)
Chemicals & Biochemicals Databases (Martindale’s Reference Desk)
Lab Manuals, Guidelines, MSDS v (Martindale’s Reference Desk)

NIST Chemistry WebBook
Physical and Chemical Properties Resources (UC Berkeley Physics and Astronomy Library)
CRC Handbook of Chemistry and Physics Online (99th Edition)
ChemSpider: Free Chemical Structure Database
Merck Index
Chemistry Calculators (


matter : material substance that occupies space, has mass, and is composed predominantly of atoms consisting of protons, neutrons, and electrons, that constitutes the observable universe, and that is interconvertible with energy — Webster

OneLook, Free Dictionary, Wiktionary, Urban Dictionary

Oxford Dictionary of Chemistry
Combined Chemical Dictionary (CRC Press)


Roget’s II (, Merriam-Webster Thesaurus, Visuwords


Matter is any substance that has mass and takes up space by having volume. All everyday objects that we can touch are ultimately composed of atoms, which are made up of interacting subatomic particles, and in everyday as well as scientific usage, “matter” generally includes atoms and anything made up of them, and any particles (or combination of particles) that act as if they have both rest mass and volume. However it does not include massless particles such as photons, or other energy phenomena or waves such as light or sound.

Matter exists in various states (also known as phases). These include classical everyday phases such as solid, liquid, and gas – for example water exists as ice, liquid water, and gaseous steam – but other states are possible, including plasma, Bose–Einstein condensates, fermionic condensates, and quark–gluon plasma.

Usually atoms can be imagined as a nucleus of protons and neutrons, and a surrounding “cloud” of orbiting electrons which “take up space”. However this is only somewhat correct, because subatomic particles and their properties are governed by their quantum nature, which means they do not act as everyday objects appear to act – they can act like waves as well as particles and they do not have well-defined sizes or positions.

In the Standard Model of particle physics, matter is not a fundamental concept because the elementary constituents of atoms are quantum entities which do not have an inherent “size” or “volume” in any everyday sense of the word. Due to the exclusion principle and other fundamental interactions, some “point particles” known as fermions (quarks, leptons), and many composites and atoms, are effectively forced to keep a distance from other particles under everyday conditions; this creates the property of matter which appears to us as matter taking up space. — Wikipedia

Eric Weisstein’s World of Chemistry
Encyclopædia Britannica



Outline of Academic Disciplines: Chemistry (Wikipedia)
Chemistry Portal (Wikipedia)


Chemistry (Wolfram Alpha)


Chemistry is the scientific discipline involved with compounds composed of atoms, i.e. elements, and molecules, i.e. combinations of atoms: their composition, structure, properties, behavior and the changes they undergo during a reaction with other compounds. Chemistry addresses topics such as how atoms and molecules interact via chemical bonds to form new chemical compounds. — Wikipedia

Encyclopædia Britannica


Chemistry stuff (YouTube Channel, HowStuffWorks)
Chemistry (HowStuffWorks)


Chemical Heritage Foundation


Alchemy May Not Have Been the Pseudoscience We All Thought It Was (Richard Conniff, Smithsonian Magazine)
Alchemy (Tim Hunkin, Rudiments of Wisdom Encyclopedia)

Robert Boyle

All Nobel Prizes in Chemistry (Nobel Foundation)
136 Major Figures in the History of Chemistry (Infoplease)


WorldCat, Library of Congress, UPenn Online Books, Open Library




Matter (Chem4Kids)
Chemical Reactions (Chem4Kids)
Matter and Materials (Fact Monster)
Chemistry (Spark Notes Study Guides)
Sci Show Chemistry (YouTube Channel)


Crash Course Chemistry (YouTube)


Chemistry Courses (MIT Open Courseware)
Chemistry Courses (Coursera)
OER Commons: Open Educational Resources



Chemists and Materials Scientists (Occupational Outlook Handbook)


American Chemical Society
Royal Society of Chemistry
International Union of Pure and Applied Chemistry
Chemical Structure Association Trust


Journal of the American Chemical Society
Nature Chemistry
Scientific American
NPR Archives







OEDILF: The Omnificent English Dictionary In Limerick Form


Song Lyrics



Journal of the American Chemical Society: Latest Articles (ACS Publications) latest articles published in Journal of the American Chemical Society

Nature Chemistry Nature Chemistry is a monthly journal dedicated to publishing high-quality papers that describe the most significant and cutting-edge research in all areas of chemistry. As well as reflecting the traditional core subjects of analytical, inorganic, organic and physical chemistry, the journal features a broad range of chemical research including, but not limited to, bioinorganic and bioorganic chemistry, catalysis, computational and theoretical chemistry, environmental chemistry, green chemistry, medicinal chemistry, organometallic chemistry, polymer chemistry, supramolecular chemistry and surface chemistry. Other multidisciplinary topics such as nanotechnology, chemical biology and materials chemistry are also featured.

  • Of HOF hosts
    by Rui-Biao Lin on November 13, 2019 at 12:00 am

    Nature Chemistry, Published online: 13 November 2019; doi:10.1038/s41557-019-0382-yHydrogen-bonded organic frameworks can readily encapsulate native enzymes and keep them active beyond biological conditions.

  • Addendum: Synthesis and reactivity of...
    by Alan R. Healy on November 12, 2019 at 12:00 am

    Nature Chemistry, Published online: 12 November 2019; doi:10.1038/s41557-019-0383-xAddendum: Synthesis and reactivity of precolibactin 886

  • Molecular engineering of organic–inorganic...
    by Yao Gao on November 11, 2019 at 12:00 am

    Nature Chemistry, Published online: 11 November 2019; doi:10.1038/s41557-019-0354-2A solution-processing step has been used to prepare quantum-well structures that comprise a thin layer of perovskite sandwiched between two layers of conjugated oligothiophene derivatives. The band gap of the resulting 2D hybrid perovskites can be fine-tuned by functionalizing the organic component, which also improves the stability of the system.

  • Chemophobia in Europe and reasons for biased risk...
    by Michael Siegrist on November 7, 2019 at 12:00 am

    Nature Chemistry, Published online: 07 November 2019; doi:10.1038/s41557-019-0377-8Very few consumers are aware that chemistry and synthetic chemicals are indispensable in making everyday goods because the products that people buy — such as cell phones, cars and processed foods — are typically far removed from the raw chemicals used in their production.

  • Author Correction: Dopant-induced electron...
    by Yansong Zhou on October 29, 2019 at 12:00 am

    Nature Chemistry, Published online: 29 October 2019; doi:10.1038/s41557-019-0381-zAuthor Correction: Dopant-induced electron localization drives CO2 reduction to C2 hydrocarbons

Geochemistry News -- ScienceDaily Earth and Climate Chemistry. Full text articles on organic and inorganic chemistry in the environment. Updated daily.

  • Lifelike chemistry created in lab search for ways...
    on November 14, 2019 at 5:40 pm

    Researchers have cultivated lifelike chemical reactions while pioneering a new strategy for studying the origin of life.

  • Chemists use light to build biologically active...
    on November 14, 2019 at 5:40 pm

    Many biologically active molecules, including synthetic drugs, contain a central, nitrogen-containing chemical structure with a three-dimensional shape. However, there are hardly any suitable methods to produce them, which also makes it difficult to discover new medicinal compounds. A team of researchers have now developed a new method, a special photocatalyst, enabling this reaction.

  • Engineers find bottlebrush copolymers can be...
    on November 14, 2019 at 4:58 pm

    A microscopic polymer in the form of a common kitchen implement, the bottlebrush, could give industry exquisite control over the properties of surface coatings.

  • NASA's Mars 2020 will hunt for microscopic fossils
    on November 14, 2019 at 3:35 pm

    Scientists with NASA's Mars 2020 rover have discovered what may be one of the best places to look for signs of ancient life in Jezero Crater, where the rover will land on Feb. 18, 2021.

  • Observing changes in chirality of molecules in...
    on November 14, 2019 at 3:31 pm

    Chiral molecules - compounds that are mirror images of each other - play an important role in biological processes and in chemical synthesis. Chemists have now succeeded for the first time in using ultrafast laser pulses to observe changes in chirality during a chemical reaction in real time.

Scientific American - Chemistry Science news and technology updates from Scientific American

Chemistry News - Biochemistry, Polymers, Materials Science provides the latest news on chemistry, biochemistry, polymers, materials science

  • Lifelike chemistry created in lab search for ways...
    on November 14, 2019 at 6:09 pm

    University of Wisconsin-Madison researchers have cultivated lifelike chemical reactions while pioneering a new strategy for studying the origin of life.

  • Engineers find bottlebrush copolymers can be...
    on November 14, 2019 at 5:09 pm

    A microscopic polymer in the form of a common kitchen implement could give industry exquisite control over coatings.

  • Observing changes in the chirality of molecules...
    on November 14, 2019 at 4:09 pm

    Some molecules can exist in two mirror-image forms, similar to our hands. Although such so-called enantiomers have almost identical physical properties, they are not the same. The fact that they behave to each other like image and mirror image is called chirality (from the Greek "cheiro" for hand). In nature, however, often only one enantiomer exists, for example in amino acids, DNA or sugars. The enzymes that produce these molecules are themselves chiral and therefore only produce one type of […]

  • New material breaks world record for turning heat...
    on November 14, 2019 at 3:27 pm

    A new type of material generates electrical current very efficiently from temperature differences. This allows sensors and small processors to supply themselves with energy wirelessly.

  • Stretchable, degradable semiconductors
    on November 13, 2019 at 1:00 pm

    To seamlessly integrate electronics with the natural world, materials are needed that are both stretchable and degradable—for example, flexible medical devices that conform to the surfaces of internal organs, but that dissolve and disappear when no longer needed. However, introducing these properties to electronics has been challenging. Now, researchers reporting in ACS Central Science have developed stretchable, degradable semiconductors that could someday find applications in health and […]