A compound is a pure substance that is made from more than one element. In a compound, elements are chemically bonded together, which makes it very difficult to separate them. Compounds are not ...

Compounds are made from two or more elements that are chemically bonded together. Compounds are a second type of pure substance. Compounds always have the same ratio of elements. For example, Pyrite ...

But why is this the case? In science, a pure substance is either a chemical element or a compound. Elements are what you find ...

When it comes to science, chemistry is elemental. That pun is based on the fact that the main building blocks in the branch of science are chemical elements, pure substances made from a single type of ...

Organic chemistry is the study of the structure, properties, composition, reactions, and preparation of carbon-containing compounds. Most organic compounds contain carbon and hydrogen, but they may ...

Side by side with this development of chemical theory has gone the discovery of new elements and compounds. Instead of the thirty elements or simple substances ... salt and the pure metal ...

In 1913, chemists Arthur Lamb and Richard Leen at New York University tried to find a definitive value for the density of pure water ... of isotopes—atoms of an element that have the same ...

The family of elements that we call the lanthanides, or lanthanoids, have a somewhat random selection of names. That's because identifying the 15 lanthanide elements took over one hundred and fifty ...

It is notoriously hard to make, but we have come to rely on it and indeed we couldn't do without this element or its compounds today ... can put very thin coatings of TiO2 onto glass (or other ...

Uranium (chemical symbol U) is a naturally occurring radioactive element. In its pure form it is a silver-coloured heavy ... and in materials made from natural substances. It is a reactive metal, and, ...