Multiple Choice
Which of the following is an example of applied science?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following is a pure substance?
A
Sand
B
Water
C
Air
D
Brass
Verified step by step guidance1
Understand the definition of a pure substance: A pure substance is a material that has a constant composition and has consistent properties throughout the sample. It can be an element or a compound.
Analyze each option: Sand, Water, Air, and Brass.
Consider Sand: Sand is a mixture of different substances, primarily silicon dioxide, but it can contain other minerals and impurities, making it a mixture rather than a pure substance.
Consider Air: Air is a mixture of gases, primarily nitrogen and oxygen, along with small amounts of other gases like carbon dioxide and argon. Therefore, air is not a pure substance.
Consider Brass: Brass is an alloy, which is a mixture of copper and zinc. Since it is a mixture of metals, it is not a pure substance. Water, on the other hand, is a compound (H₂O) with a consistent composition, making it a pure substance.
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