Dictionary of Chemistry 8e companion weblinks

Archived web links

Here is a list of recommended web links, arranged alphabetically by the relevant dictionary entries:

A B C D E F G H I J K L M N O P R S T U V W X Y Z

Useful websites

A  Top

acetals
https://www.acdlabs.com/iupac/nomenclature/93/r93_460.htm
Information about IUPAC nomenclature

acid anhydrides
https://www.acdlabs.com/iupac/nomenclature/93/r93_534.htm
Information about IUPAC nomenclature

actinium
https://www.webelements.com/actinium/
Information from the WebElements site

acyl halides
https://www.acdlabs.com/iupac/nomenclature/93/r93_529.htm
Information about IUPAC nomenclature

alcohols
https://www.acdlabs.com/iupac/nomenclature/79/r79_202.htm
Information about IUPAC nomenclature

aldehydes
https://www.acdlabs.com/iupac/nomenclature/93/r93_449.htm
Information about IUPAC nomenclature

alkanes
https://www.acdlabs.com/iupac/nomenclature/79/r79_34.htm
Information about IUPAC nomenclature
https://www.acdlabs.com/iupac/nomenclature/79/r79_36.htm
Further details about nomenclature

alkenes
https://www.acdlabs.com/iupac/nomenclature/79/r79_53.htm
Information about IUPAC nomenclature

alkynes
https://www.acdlabs.com/iupac/nomenclature/79/r79_53.htm
Information about IUPAC nomenclature

aluminium
https://www.webelements.com/aluminium/
Information from the WebElements site

americium
https://www.webelements.com/americium/
Information from the WebElements site

amides
https://www.acdlabs.com/iupac/nomenclature/93/r93_543.htm
Information about IUPAC nomenclature

amines
https://www.acdlabs.com/iupac/nomenclature/93/r93_398.htm
Information about IUPAC nomenclature of primary amines
https://www.acdlabs.com/iupac/nomenclature/93/r93_402.htm
Information about IUPAC nomenclature of secondary and tertiary amines

amino acid
https://www.qmul.ac.uk/sbcs/iupac/AminoAcid/
Information about IUPAC nomenclature

antimony
https://www.webelements.com/antimony/
Information from the WebElements site

argon
https://www.webelements.com/argon/
Information from the WebElements site

aromatic compound
https://www.acdlabs.com/iupac/nomenclature/79/r79_61.htm
Information about IUPAC nomenclature

arsenic
https://www.webelements.com/arsenic/
Information from the WebElements site

astatine
https://www.webelements.com/astatine/
Information from the WebElements site

astrochemistry
http://www.strw.leidenuniv.nl/iau34/
The website of the astrochemistry work group of the International Astronomical Union

azine
https://www.acdlabs.com/iupac/nomenclature/93/r93_469.htm
Information about IUPAC nomenclature

azo compounds
https://www.acdlabs.com/iupac/nomenclature/93/r93_377.htm
Information about IUPAC nomenclature

B  Top

barium
https://www.webelements.com/barium/
Information from the WebElements site

berkelium
https://www.webelements.com/berkelium/
Information from the WebElements site

beryllium
https://www.webelements.com/beryllium/
Information from the WebElements site

bismuth
https://www.webelements.com/bismuth/
Information from the WebElements site

bohrium
https://www.webelements.com/bohrium/
Information from the WebElements site

boron
https://www.webelements.com/boron/
Information from the WebElements site

bottled gas
https://www.boconline.co.uk/en/health-and-safety/gas-safety/identifying-gas-cylinders/industrial-gas-cylinder-colours/index.html
Information on colour coding of gas containers

bromine
https://www.webelements.com/bromine/
Information from the WebElements site

Brownian motion
http://labs.minutelabs.io/Brownian-Motion/
An interactive video simulation of Brownian movement
http://web.lemoyne.edu/~giunta/perrin.html
Jean Perrin's paper

buckminsterfullerene
https://www.qmul.ac.uk/sbcs/iupac/fullerene2/
Information about IUPAC nomenclature and representation of fullerenes

C  Top

cadmium
https://www.webelements.com/cadmium/
Information from the WebElements site

caesium
https://www.webelements.com/caesium/
Information from the WebElements site

calcium
https://www.webelements.com/calcium/
Information from the WebElements site

californium
https://www.webelements.com/californium/
Information from the WebElements site

carbohydrate
https://www.qmul.ac.uk/sbcs/iupac/2carb/
Information about IUPAC nomenclature

carbon
https://www.webelements.com/carbon/
Information from the WebElements site

carboxylic acids
https://www.acdlabs.com/iupac/nomenclature/93/r93_480.htm
Information about IUPAC nomenclature

CAS registry
https://www.cas.org/support/documentation/chemical-substances/faqs
Further information from the CAS site

cerium
https://www.webelements.com/cerium/
Information from the WebElements site

ChemDraw
http://www.perkinelmer.com/category/chemdraw
The PerkinElmer website, giving details about ChemDraw and associated software

chemical markup language
http://www.ch.ic.ac.uk/rzepa/chimeral/documents/FAQ/FAQ.html
An FAQ produced by the Chemistry Department, Cambridge University

Chemical Weapons Convention
https://www.opcw.org/
The OPCW website, giving details of the convention

ChemSketch
https://www.acdlabs.com/resources/freeware/chemsketch/
Details and download from Advanced Chemistry Development website

chlorine
https://www.webelements.com/chlorine/
Information from the WebElements site

chromium
https://www.webelements.com/chromium/
Information from the WebElements site

cis
https://www.acdlabs.com/iupac/nomenclature/93/r93_620.htm
Information about IUPAC nomenclature

close packing
https://www.chemtube3d.com/_ccpfinal/
An interactive version of cubic close-packing
http://mathworld.wolfram.com/HexagonalClosePacking.html
An interactive version of hexagonal close packing

cobalt
https://www.webelements.com/cobalt/
Information from the WebElements site

controlled substance
https://www.drugwise.org.uk/what-are-the-uk-drug-laws/
Detailed information on UK drug laws from the DrugWise website

coordination compound
http://www.chemistry.wustl.edu/~edudev/LabTutorials/naming_coord_comp.html
Rules for naming coordination compounds

copper
https://www.webelements.com/copper/
Information from the WebElements site

cubic crystal
https://www.chemtube3d.com/_simplecubicfinal/
An interactive version of a simple cubic crystal
https://www.chemtube3d.com/_bccfinal/
An interactive version of a body-centred cubic crystal
https://www.chemtube3d.com/_ccpfinal/
An interactive version of a face-centred cubic crystal

curium
https://www.webelements.com/curium/
Information from the WebElements site

cycloalkanes
https://www.acdlabs.com/iupac/nomenclature/79/r79_60.htm
Information about IUPAC nomenclature

cyclophane
https://www.qmul.ac.uk/sbcs/iupac/phane2/
Information about IUPAC nomenclature

D  Top

darmstadtium
https://www.webelements.com/darmstadtium/
Information from the WebElements site

depression of freezing point
http://web.lemoyne.edu/~giunta/raoult.html
Raoult’s original paper

diazo compounds
https://www.acdlabs.com/iupac/nomenclature/93/r93_377.htm
Information about IUPAC nomenclature

Döbereiner’s triads
http://web.lemoyne.edu/~giunta/dobereiner.html
Döbereiner’s original paper

dubnium
https://www.webelements.com/dubnium/
Information from the WebElements site

Dulong and Petit’s law
http://web.lemoyne.edu/~giunta/petit.html
Original paper

dysprosium
https://www.webelements.com/dysprosium/
Information from the WebElements site

E  Top

einsteinium
https://www.webelements.com/einsteinium/
Information from the WebElements site

enzyme
https://www.qmul.ac.uk/sbcs/iubmb/enzyme/
Information about IUPAC nomenclature

erbium
https://www.webelements.com/erbium/
Information from the WebElements site

esters
https://www.acdlabs.com/iupac/nomenclature/93/r93_511.htm
Information about IUPAC nomenclature

ethers
https://www.acdlabs.com/iupac/nomenclature/79/r79_227.htm
Information about IUPAC nomenclature

europium
https://www.webelements.com/europium/
Information from the WebElements site

E–Z convention
https://www.acdlabs.com/iupac/nomenclature/93/r93_626.htm
Information about the convention from IUPAC

F  Top

fermium
https://www.webelements.com/fermium/
Information from the WebElements site

fluorine
https://www.webelements.com/fluorine
Information from the WebElements site

fluorite structure
http://www.chemtube3d.com/solidstate/_fluorite(final).htm
An interactive version of the structure

francium
https://www.webelements.com/francium/
Information from the WebElements site

fundamental constants
https://physics.nist.gov/cuu/Constants/
fundamental physical constants from NIST

fused ring
https://www.acdlabs.com/iupac/nomenclature/79/r79_63.htm
Information about IUPAC nomenclature

G  Top

gadolinium
https://www.webelements.com/gadolinium/
Information from the WebElements site

gallium
https://www.webelements.com/gallium/
Information from the WebElements site

germanium
https://www.webelements.com/germanium/
Information from the WebElements site

gold
https://www.webelements.com/gold/
Information from the WebElements site

H  Top

hafnium
https://www.webelements.com/hafnium/
Information from the WebElements site

Hantz–Widman system
https://www.qmul.ac.uk/sbcs/iupac/
Information about IUPAC nomenclature

hassium
https://www.webelements.com/hassium/
Information from the WebElements site

helium
https://www.webelements.com/helium/
Information from the WebElements site

holmium
https://www.webelements.com/holmium/
Information from the WebElements site

hydrazones
https://www.acdlabs.com/iupac/nomenclature/93/r93_469.htm
Information about IUPAC nomenclature

hydrogen
https://www.webelements.com/hydrogen/
Information from the WebElements site

hydrogen spectrum
http://web.lemoyne.edu/~giunta/balmer.html
Balmer's paper

hydroxylamine
https://www.acdlabs.com/iupac/nomenclature/93/r93_409.htm
Information about IUPAC nomenclature

I  Top

imides
https://www.acdlabs.com/iupac/nomenclature/93/r93_543.htm
Information about IUPAC nomenclature

imines
https://www.acdlabs.com/iupac/nomenclature/93/r93_406.htm
Information about IUPAC nomenclature

InChI
https://www.inchi-trust.org/technical-faq-2/#1.1
An FAQ produced by the InChi Trust
https://iupac.org/who-we-are/divisions/division-details/inchi/
Information and downloads from the IUPAC site

indium
https://www.webelements.com/indium/
Information from the WebElements site

iodine
https://www.webelements.com/iodine/
Information from the WebElements site

ionization potential
https://www.nist.gov/pml/ground-levels-and-ionization-energies-neutral-atoms
A table of values from NIST

iridium
https://www.webelements.com/iridium/
Information from the WebElements site

iron
https://www.webelements.com/iron/
Information from the WebElements site

isonitrile
https://www.acdlabs.com/iupac/nomenclature/93/r93_557.htm
Information about IUPAC nomenclature

IUPAC
https://iupac.org/
The IUPAC home page

J  Top

JMol
http://jmol.sourceforge.net/
Details and a download for JMol from SourceForge

K  Top

ketals
https://www.acdlabs.com/iupac/nomenclature/93/r93_460.htm
Information about IUPAC nomenclature

ketene
https://www.acdlabs.com/iupac/nomenclature/79/r79_292.htm
Information about IUPAC nomenclature

ketones
https://www.acdlabs.com/iupac/nomenclature/93/r93_453.htm
Information about IUPAC nomenclature

krypton
https://www.webelements.com/krypton/
Information from the WebElements site

L  Top

lactams
https://www.acdlabs.com/iupac/nomenclature/93/r93_521.htm
Information about IUPAC nomenclature

lactims
https://www.acdlabs.com/iupac/nomenclature/93/r93_521.htm
Information about IUPAC nomenclature

lactones
https://www.acdlabs.com/iupac/nomenclature/93/r93_521.htm
Information about IUPAC nomenclature

lanthanum
https://www.webelements.com/lanthanum/
Information from the WebElements site

law of octaves
http://web.lemoyne.edu/~giunta/newlands.html
John Newlands’ paper

lawrencium
https://www.webelements.com/lawrencium/
Information from the WebElements site

lead
https://www.webelements.com/lead/
Information from the WebElements site

Le Chatelier’s principle
http://web.lemoyne.edu/~giunta/lechat.html
Le Chatelier’s original paper

lipid
https://www.qmul.ac.uk/sbcs/iupac/lipid/
Information about IUPAC nomenclature of lipids

lithium
https://www.webelements.com/lithium/
Information from the WebElements site

lutetium
https://www.webelements.com/lutetium/
Information from the WebElements site

M  Top

magnesium
https://www.webelements.com/magnesium/
Information from the WebElements site

manganese
https://www.webelements.com/manganese/
Information from the WebElements site

meitnerium
https://www.webelements.com/meitnerium/
Information from the WebElements site

mendelevium
https://www.webelements.com/mendelevium/
Information from the WebElements site

mercury
https://www.webelements.com/mercury/
Information from the WebElements site

Michaelis–Menten curve
https://web.lemoyne.edu/~giunta/menten.html
Original paper on Michaelis–Menten kinetics

molybdenum
https://www.webelements.com/molybdenum/
Information from the WebElements site

moscovium
https://www.webelements.com/moscovium/
Information from the WebElements site

Moseley’s law
https://web.lemoyne.edu/~giunta/Moseley-article.html
Original paper on the law

N  Top

neodymium
https://www.webelements.com/neodymium/
Information from the WebElements site

neon
https://www.webelements.com/neon/
Information from the WebElements site

neptunium
https://www.webelements.com/neptunium/
Information from the WebElements site

nickel
https://www.webelements.com/nickel/
Information from the WebElements site

nickel arsenide structure
http://www.chemtube3d.com/solidstate/_NiAs(final).htm
An interactive version of the structure

nihonium
https://www.webelements.com/nihonium/
Information from the WebElements site

niobium
https://www.webelements.com/niobium/
Information from the WebElements site

nitriles
https://www.acdlabs.com/iupac/nomenclature/93/r93_557.htm
Information about IUPAC nomenclature

nitrogen
https://www.webelements.com/nitrogen/
Information from the WebElements site

nobelium
https://www.webelements.com/nobelium/
Information from the WebElements site

nucleic acid
https://www.acdlabs.com/iupac/nomenclature/93/r93_557.htm
Information about UIPAC nomenclature

O  Top

oganesson
https://www.webelements.com/oganesson/
Information from the WebElements site

organometallic compound
https://www.acdlabs.com/iupac/nomenclature/93/r93_18.htm
Information about IUPAC nomenclature

osmium
https://www.webelements.com/osmium/
Information from the WebElements site

oximes
https://www.acdlabs.com/iupac/nomenclature/93/r93_469.htm
Information about IUPAC nomenclature

oxygen
https://www.webelements.com/oxygen/
Information from the WebElements site

P  Top

palladium
https://www.webelements.com/palladium/
Information from the WebElements site

peptide
https://www.qmul.ac.uk/sbcs/iupac/AminoAcid/
Information about IUPAC nomenclature of peptides

periodic table
https://www.webelements.com/
The WebElements table produced by Mark Winter at the University of Sheffield
https://www.meta-synthesis.com/webbook/35_pt/pt_database.php
Over 300 different forms of the periodic table in the Chemogenesis web book by Mark R. Leach

perovskite structure
http://www.chemtube3d.com/solidstate/_perovskite(final).htm
An interactive version of the structure

peroxides
https://www.acdlabs.com/iupac/nomenclature/79/r79_245.htm
Information about IUPAC nomenclature

persistent organic pollutant
http://chm.pops.int/default.aspx
Official Stockholm Convention site

phosphorus
https://www.webelements.com/phosphorus/
Information from the WebElements site

platinum
https://www.webelements.com/platinum/
Information from the WebElements site

plutonium
https://www.webelements.com/plutonium/
Information from the WebElements site

polonium
https://www.webelements.com/polonium/
Information from the WebElements site

polymer
https://www.qmul.ac.uk/sbcs/iupac/BriefGuide/polymer.html
Information about IUPAC nomenclature

potassium
https://www.webelements.com/potassium/
Information from the WebElements site

praseodymium
https://www.webelements.com/praseodymium/
Information from the WebElements site

promethium
https://www.webelements.com/promethium/
Information from the WebElements site

protactinium
https://www.webelements.com/protactinium/
Information from the WebElements site

Prout’s hypothesis
http://web.lemoyne.edu/~giunta/prout.html
William Prout's original paper

R  Top

radical
https://www.acdlabs.com/iupac/nomenclature/93/r93_569.htm
Information about IUPAC nomenclature
https://www.acdlabs.com/iupac/nomenclature/79/r79_1036.htm
List of radical names

radium
https://www.webelements.com/radium/
Information from the WebElements site

radon
https://www.webelements.com/radon/
Information from the WebElements site

Raman effect
http://www.uky.edu/~holler/raman.html
The original paper by Raman and Krishnan

Raoult’s law
http://web.lemoyne.edu/~giunta/raoult2.html
Raoult’s original paper

RasMol
http://www.umass.edu/microbio/rasmol/getras.htm
A downloadable version of RasMol from the website of the University of Massachusetts Amherst

relative atomic mass
https://www.webelements.com/periodicity/atomic_weight/
Information from the WebElements site

rhenium
https://www.webelements.com/rhenium/
Information from the WebElements site

rhodium
https://www.webelements.com/rhodium/
Information from the WebElements site

rock salt structure
http://www.chemtube3d.com/solidstate/_rocksalt(final).htm
An interactive version of the structure

roentgenium
https://www.webelements.com/roentgenium/
Information from the WebElements site

R–S convention
https://www.acdlabs.com/iupac/nomenclature/93/r93_630.htm
Information about IUPAC nomenclature

rubidium
https://www.webelements.com/rubidium/
Information from the WebElements sit

ruthenium
https://www.webelements.com/ruthenium/
Information from the WebElements site

rutherfordium
https://www.webelements.com/rutherfordium/
Information from the WebElements site

rutile structure
http://www.chemtube3d.com/solidstate/_rutile(final).htm
An interactive version of the structure

S  Top

saccharide
https://www.qmul.ac.uk/sbcs/iupac/2carb/
Information about IUPAC nomenclature

samarium
https://www.webelements.com/samarium/
Information from the WebElements site

scandium
https://www.webelements.com/scandium/
Information from the WebElements site

seaborgium
https://www.webelements.com/seaborgium/
Information from the WebElements site

selenium
https://www.webelements.com/selenium/
Information from the WebElements site

semicarbazones
https://www.acdlabs.com/iupac/nomenclature/93/r93_469.htm
Information about IUPAC nomenclature

silicon
https://www.webelements.com/silicon/
Information from the WebElements site

silver
https://www.webelements.com/silver/
Information from the WebElements site

SMILES
http://www.daylight.com/dayhtml_tutorials/languages/smiles/index.html
A SMILES tutorial produced by Daylight Chemical Information Systems Inc.

sodium
https://www.webelements.com/sodium/
Information from the WebElements site

spectroscopy
http://web.mit.edu/spectroscopy/history/spec-history.html
A history of spectroscopy from the NorthEast Astronomy Forum

sphalerite structure
http://www.chemtube3d.com/solidstate/_blende(final).htm
An interactive version of the structure

spinel structure
http://www.chemtube3d.com/solidstate/_spinel(final).htm
An interactive version of the structure

spiro compound
https://www.acdlabs.com/iupac/nomenclature/79/r79_197.htm
Information about IUPAC nomenclature
https://www.acdlabs.com/iupac/nomenclature/79/r79_198.htm
Alternative naming system for spiro compounds

steroid
https://www.qmul.ac.uk/sbcs/iupac/steroid/3S01.html
Information about IUPAC nomenclature

strontium
https://www.webelements.com/strontium/
Information from the WebElements site

sulphanes
https://www.acdlabs.com/iupac/nomenclature/79/r79_197.htm
Information about IUPAC nomenclature

sulphonic acids
https://www.acdlabs.com/iupac/nomenclature/93/r93_503.htm
Information about IUPAC nomenclature

sulphoxides
https://www.acdlabs.com/iupac/nomenclature/79/r79_460.htm
Information about IUPAC nomenclature

sulphur
https://www.webelements.com/sulfur/
Information from the WebElements site

T  Top

tantalum
https://www.webelements.com/tantalum/
Information from the WebElements site

technetium
https://www.webelements.com/technetium/
Information from the WebElements site

tellurium
https://www.webelements.com/tellurium/
Information from the WebElements site

tennessine
https://www.webelements.com/tennessine/
Information from WebElements site

terbium
https://www.webelements.com/terbium/
Information from the WebElements site

terpenes
https://www.acdlabs.com/iupac/nomenclature/79/r79_12.htm
Information about IUPAC nomenclature

thallium
https://www.webelements.com/thallium/
Information from the WebElements site

thermodynamics
http://chemed.chem.purdue.edu/genchem/topicreview/bp/ch21/chemical.php
A tutorial from the Division of Chemical Education, Purdue University, Indiana
http://www.codata.info/resources/databases/key1.html
Thermodynamic properties from the Committee on Data for Science and Technology

thorium
https://www.webelements.com/thorium/
Information from the WebElements site

thulium
https://www.webelements.com/thulium/
Information from the WebElements site

tin
https://www.webelements.com/tin/
Information from the WebElements site

titanium
https://www.webelements.com/titanium/
Information from the WebElements site

tungsten
https://www.webelements.com/tungsten/
Information from the WebElements site

U  Top

uranium
https://www.webelements.com/uranium/
Information from the WebElements site

V  Top

vanadium
https://www.webelements.com/vanadium/
Information from the WebElements site

vitamin A
https://www.qmul.ac.uk/sbcs/iupac/misc/ret.html
Information about IUPAC nomenclature

vitamin B complex
https://www.qmul.ac.uk/sbcs/iupac/misc/B6.html
Information about IUPAC nomenclature for vitamin B6 and related compounds
https://www.qmul.ac.uk/sbcs/iupac/misc/B12.html
Information about IUPAC nomenclature for vitamin B12 and derivatives

vitamin D
https://www.qmul.ac.uk/sbcs/iupac/misc/D.html
Information about IUPAC nomenclature

vitamin E
https://www.qmul.ac.uk/sbcs/iupac/misc/toc.html
Information about IUPAC nomenclature

von Baeyer nomenclature
https://www.qmul.ac.uk/sbcs/iupac/vonBaeyer/
Information about the IUPAC system

W  Top

wurtzite structure
http://www.chemtube3d.com/solidstate/_wurtzite(final).htm
An interactive version of the structure

X  Top

xenon
https://www.webelements.com/xenon/
Information from the WebElements site

Y  Top

ytterbium
https://www.webelements.com/ytterbium/
Information from the WebElements site

yttrium
https://www.webelements.com/yttrium/
Information from the WebElements site

Z  Top

Zeeman effect
https://www.nobelprize.org/prizes/physics/1902/zeeman/lecture/
Nobel lecture by Pieter Zeeman after receiving the Nobel Prize for physics, 1902

zinc
https://www.webelements.com/zinc/
Information from the WebElements site

zirconium
https://www.webelements.com/zirconium/
Information from the WebElements site

 

Useful websites  Top

 

AAAS
https://www.sciencemag.org/
Access to the Science magazine of the American Association for the Advancement of Science. It includes current science news and some feature articles.

Alchemy
http://levity.com/alchemy
An extensive collection of information on alchemy in all its facets. It provides over 200 complete alchemical texts, extensive bibliographical material, numerous articles, and introductory and general reference material on alchemy.

American Chemical Society
https://www.acs.org/content/acs/en.html
The official website for the ACS. An extensive site with a range of materials for professionals, students, and educators: these include news, features, and practical safety advice, as well as a guide to ‘green chemistry’.

Chemistry and Industry
https://www.soci.org/Chemistry-and-Industry
The website of the journal Chemistry and Industry offering daily news and summaries of selected current and past articles from the magazine.

Classic Chemistry
https://web.lemoyne.edu/giunta/papers.html
An important collection of original papers in chemistry compiled by Carmen Giunta at Le Moyne College. The site contains links to other historical sources.

IUPAC
https://iupac.org/
The official home page of the International Union of Pure and Applied Chemistry.

IUPAC Nomenclature
https://www.qmul.ac.uk/sbcs/iupac/
A large amount of information on organic and biochemical nomenclature maintained by G. P. Moss at Queen Mary College, University of London.

IUPAC Organic Nomenclature
http://www.chem.ucalgary.ca/courses/351/WebContent/orgnom/index.html
An introduction to the IUPAC rules for organic nomenclature maintained by the University of Calgary

Molecule of the Month
http://www.chm.bris.ac.uk/motm/motm.htm
A site at the School of Chemistry, Bristol. A new molecule is added every month, with the structure displayed along with interesting facts about the compound.

Nature Magazine Online
https://www.nature.com/
An online weekly journal that offers news articles and features and information on the latest science research.

New Scientist
https://www.newscientist.com/
A popular news and archive site for all branches of science.

NIST Webbook
https://webbook.nist.gov/chemistry/
A database of chemical compounds at the US National Institute of Standards and Technology, searchable by name, formula, etc. Information on the compound is given and a molfile of the structure is usually available along with spectral and other information. The main NIST site links to other useful databases including fundamental constants, units, and conversion factors.

Nobel Prizes
https://www.nobelprize.org/
The official website of the Royal Swedish Academy listing all Nobel prizewinners. It provides biographical information for all prizewinners along with a good deal of background information covering the science involved.

Royal Society of Chemistry
https://www.rsc.org/
The official website of the RSC. A certain amount of information is available to nonmembers including podcasts, simulations, and an interactive periodic table.

Scientific American
https://www.scientificamerican.com/
A popular science site containing news and the full version of selected recent articles from the magazine.

WebElements
https://www.webelements.com/
The definitive web periodic table produced by Mark Winter at the University of Sheffield. It is linked to a very comprehensive database containing properties of the elements and their compounds.