Multiple Choice
Which type of mixture best describes air?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following samples is a pure substance?
A
Brass
B
Air
C
Distilled water (H_2O)
D
Seawater
Verified step by step guidance1
Understand the definition of a pure substance: A pure substance has a fixed composition and distinct chemical properties. It consists of only one type of particle, either an element or a compound.
Analyze each sample: Brass is an alloy (a mixture of metals), so it is not a pure substance.
Air is a mixture of gases (mainly nitrogen, oxygen, and other gases), so it is not a pure substance.
Seawater is a mixture of water and dissolved salts and other substances, so it is not a pure substance.
Distilled water (H_2O) consists of only one type of molecule with a fixed composition, making it a pure substance.
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