Multiple Choice
Which of the following statements about air is true?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following is the best example of a pure substance?
A
Milk
B
Air
C
Distilled water (H_2O)
D
Brass
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 to determine if it meets the criteria of a pure substance:
Milk is a mixture of water, fats, proteins, and other components, so it is not a pure substance.
Air is a mixture of gases like nitrogen, oxygen, carbon dioxide, and others, so it is not a pure substance.
Brass is an alloy made of copper and zinc, which means it is a mixture, not a pure substance.
Distilled water (H\_2O) consists of only water molecules with no other substances mixed in, making it a pure substance.
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