Chemical substance In organic chemistry, there can be more than one chemical compound with the same composition and molecular weight. Generally, these are called isomers. Isomers usually have substantially different chemical properties, and often may be isolated without spontaneously interconverting. A common example is glucose vs. fructose. The former is an aldehyde, the latter is a ketone. Their interconversion requires either enzymatic or acid-base catalysis. However, tautomers are an exception: the isomerization occurs spontaneously in ordinary conditions, such that a pure substance cannot be isolated into its tautomers, even if these can be identified spectroscopically or even isolated in special conditions. A
Internet-related prefixes Internet-related prefixes Internet-related prefixes such as "e-", "i-", "cyber-", "info-", "techno-" and "net-" are added to a wide range of existing words to describe new, Internet- or computer-related flavors of existing concepts, often electronic products and services that already have a non-electronic counterpart. The adjective "virtual" is often used in a similar manner. "Cyber-" is derived from "cybernetic," which comes from the Greek word κυβερνητικός meaning "skilled in steering or governing". It is mainly used in the terms "cyberspace", "cyberlaw", "cyberbullying", "cybercrime", "cyberwarfare", "cyberterrorism", "cybersex", and "cyberdelic" among others. Although it is more commonly used to describe policies and politics