Barber State Board Exam Complete Practice Test

Question: 1 / 400

What is an example of a pure substance?

Water

Salt

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.

Get further explanation with Examzify DeepDiveBeta

Air

Next Question

Report this question

Download Barber Practice State Board Practice Exam PDF Study Guide
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy