Respuesta :
A pure substance which can be separated into simpler substances by any chemical or physical means is known as compound. Compounds have two or more type of atoms.
A pure substance which cannot be divided into simpler substances by any chemical or physical means is known as elements. Elements have only one type of atom.
Hence,
[tex]Cu[/tex] is element (E)
[tex]HCl[/tex] is compound (C)
[tex]CCl_4[/tex] is compound (C)
[tex]Co[/tex] is element (E)
[tex]HI[/tex] is compound (C)
[tex]CH_4[/tex] is compound (C)
