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www.reference.com/science/two-types-pure-substances-2666ec84a82e8f33

The two types of pure substances are elements and compounds. A pure substance is that which consists of only one component with distinct chemical and physical properties. Any substance with more than one component is called a mixture.

www.reference.com/science/water-pure-substance-dbcc71b6659f8ab0

Water is a pure substance. This is because it has the same material all over and is made of one kind of substance throughout. Moreover, water cannot be separated into other materials.

www.reference.com/article/air-pure-substance-f692132f8409d1e8

Air is not a pure substance but a mixture of different gases. It is composed of approximately 78 percent nitrogen and 21 percent oxygen, with small amounts of about a dozen other gases making up the remainder.

www.reference.com/science/sugar-pure-substance-a4856f7ae1a91fbd

Sugar is a pure substance because its composition is homogeneous throughout. Pure substances can be either elements or compounds. Sugar or sucrose is a compound with the chemical formula C12H22O11.

www.reference.com/science/pure-substance-science-9745a6a9b7b16cb5

A pure substance is any single type of material that has not been contaminated by another substance. Water is considered a pure substance if the water contains only hydrogen and oxygen.

www.reference.com/science/difference-between-pure-substance-mixture-c40ebd29b5e8f7bd

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, salt water is a mixture because it contains salt as well as water.

www.reference.com/world-view/salt-pure-substance-99bbdc9838fece6f

Sodium chloride, commonly known as table salt, is a pure substance. In chemistry, the term "salt" is a reference to a variety of compounds formed in the reaction of a base and an acid. Compounds are considered to be pure substances.

www.reference.com/science/milk-pure-substance-69a77f3385eb571

Milk is not a pure substance; it is considered a mixture because it does not occur naturally on its own. It is a mixture that combines mostly water, sugar, fat and proteins.

www.reference.com/article/pure-substance-cannot-broken-down-8acda9f629a53441

A pure substance that cannot be broken down is an element. Atoms of the same element are identical physically and chemically. An element's atoms are physically and chemically different from those of another element.

www.reference.com/article/air-pure-substance-mixture-53418c7b489860f6

Air is a mixture, which is primarily made up of nitrogen and oxygen. It is more nitrogen than oxygen, with about 78 percent of the makeup being the nitrogen and 21 percent oxygen.