Barber Practice State Board Practice Exam

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What is an example of a pure substance?

Water
Salt
Aluminum Foil
Air

The correct answer is: Aluminum Foil

A pure substance is defined as a material that has a consistent and uniform composition throughout. It can exist as an element or a compound, and it cannot be separated into other substances by any physical means. Aluminum foil is considered a pure substance because it is made of a single element, aluminum, in its metallic form. As such, it maintains the same composition and properties throughout the entire material. This means that no matter where you sample the aluminum foil, it will be the same in terms of its chemical and physical properties. In contrast, water and salt are both compounds; water is made up of hydrogen and oxygen, while salt (sodium chloride) is composed of sodium and chloride ions. Air, on the other hand, is a mixture of various gases, primarily nitrogen and oxygen, among others, and does not have a uniform composition. Thus, the unique and uniform nature of aluminum foil qualifies it as an example of a pure substance.