Utirik Atoll Utirik Atoll Utirik Atoll or Utrik Atoll (Marshallese: , ) is a coral atoll of 10 islands in the Pacific Ocean, and forms a legislative district of the Ratak Chain of the Marshall Islands. Its total land area is only , but it encloses a lagoon with an area of . It is located approximately east of Ujae Atoll. The population of Utirik Atoll is 409; it is one of the northernmost Marshall Islands with permanent habitation. The larger islets are: Its first recorded sighting was by the Spanish navigator Álvaro de Saavedra on board of the ship "Florida" on
Chemical substance and the International Chemical Identifier or InChI. Often a pure substance needs to be isolated from a mixture, for example from a natural source (where a sample often contains numerous chemical substances) or after a chemical reaction (which often give mixtures of chemical substances). Chemical substance A chemical substance is a form of matter having constant chemical composition and characteristic properties. It cannot be separated into components by physical separation methods, i.e., without breaking chemical bonds. Chemical substances can be simple substances, chemical compounds, or alloys. Chemical elements may or may not be included in the definition, depending on expert