__________ is a physical combination of two or more substances that aren't chemically joined. CompoundMoleculeMixtureIon

A combination of two or more substances that are not chemically combined

What is a substance made up of two or more different types of atoms chemically combined in a fixed ratio called? CompoundMixtureSolutionElement

A  is a substance in which two or more different elements are bonded together, regardless of the type of bond. A  is a substance that includes two or more atoms that are  bonded to each other. It is possible for a substance to be both a  and a  which is called a "molecular compound."

A substance that contains two or more different types of atoms chemically bonded together

are physical combinations of two or more substances, each retaining its own properties.