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 ...

Most organic compounds contain carbon and hydrogen, but they may also include any number of other elements (e.g., nitrogen, oxygen, halogens, phosphorus, silicon, sulfur). Originally limited to the ...

Build an element ball, solve periodic puzzles, and check out some of the most unusual periodic tables you’ve ever seen. As students play the Chemistry Name Game, they will learn why compounds form as ...

that water is a chemical compound made up of two hydrogen atoms and a single oxygen atom or H 2 O. For thousands of years, ...