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 ...

And that’s it! Nearly everything in this room, in your room, and in the entire universe, is made of: elements with one kind of atom, compounds containing different types of atoms chemically ...

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 ...