carbon, hydrogen, and oxygen. it is called glucose, fructose, saccharose, lactose, ....
It is an element
Shortening, such as Crisco, is made from vegetable oil.
Tin itself is an element, abbreviated Sn, from the Latin Stannum.It's atomic number is 50 and its mass 120amu. See Wikipedia "tin" for details.
Argon is a noble gas. Argon gas is only composed of argon