The main substances in air are n 2 (nitrogen), o 2 (oxygen), co 2 (carbon dioxide), h 2 o (water), and ar (argon). which of these substances are elements? which are compounds? which are molecules?

delegated (sometimes called enumerated or expressed) powers are specifically granted to the federal government in article i, section 8 of the constitution. this includes the power to coin money, to regulate commerce, to declare war, to raise and maintain armed forces, and to establish a post office.