According to the Encyclopedia Britannica, ammonia is a pure substance because it is a compound of the elements nitrogen and hydrogen. The two elements are joined chemically, so it cannot be considered a mixture. More »

Gasoline is a homogeneous mixture made from processing or refining crude oils. A homogeneous mixture consists of combinations of different substances. However, a homogeneous mixture also has uniform composition and prope... More »

Elemental mercury is a pure substance and its own element on the periodic table of elements. It can be combined with other elements to form compounds of various natures, such as mercury oxide. Mercury occurs naturally, b... More »

www.reference.com Science Chemistry Atoms & Molecules

A pure substance contains only one kind of molecule, and a mixture is a combination of two or more pure substances. Distilled water, aluminum foil and table sugar are each made from only one type of particle. However, sa... More »

Metal alloys, which are a mixture of metal and at least one other substance, are used because they are more suited for a particular task than a pure metal is. Metal alloys are typically either harder, stronger, lighter o... More »

You can compare and contrast mixtures and pure substances by determining if the substance can be separated into homogeneous materials. Determine if the substance can be changed into a different substance as well. More »

Orange juice is not a pure substance but a mixture of different pure substances. Pure substances are made of only one type or atom or molecule. Orange juice, even fresh squeezed from the orange and not reconstituted with... More »