Multiple Choice
Which of the following best describes the composition of the tail of a comet?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following is classified as a pure substance?
A
Air
B
Nitrogen
C
Apple juice
D
Tap water
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 option: Air is a mixture of gases (mainly nitrogen, oxygen, and others), so it is not a pure substance.
Apple juice is a mixture of water, sugars, acids, and other compounds, so it is not a pure substance.
Tap water contains water along with dissolved minerals and impurities, making it a mixture rather than a pure substance.
Nitrogen (N\_2) is an element consisting of only one type of molecule, so it is classified as a pure substance.
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