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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.


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.


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.


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.


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.


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.


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.


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.


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.


The physical properties of matter are texture, appearance, odor, color, boiling point, melting point, solubility, density, polarity and others. Physical properties describe the observations of the three states of matter. The three states of matter are gases, liquids and solids.