Aids burning. Found in air. Used to treat breathing problems A compound is a substance that contains atoms of two or more different elements, chemically joined together. For example, water is a ...

Elements cannot be broken down into simpler substances. They are made from only one type of atom. Fool’s gold, or Pyrite, is represented by the letters ‘FeS2’. Both ‘Fe’ and ‘S’ can be found on the ...

Ever Salazar of MinuteEarth explained how scientists in the late 18th Century dispelled the long-held notion that water was ...

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