Multiple Choice
Which of the following substances is a mixture?
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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
Oxygen gas (O_2)
B
Air
C
Salt water
D
Brass
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Understand the definition of a pure substance: A pure substance has a uniform and definite composition, consisting of only one type of particle or molecule throughout.
Analyze each option to determine if it meets the criteria of a pure substance:
Air is a mixture of different gases (mainly nitrogen, oxygen, and others), so it is not a pure substance.
Salt water is a homogeneous mixture of salt (NaCl) dissolved in water (H_2O), so it is not a pure substance.
Brass is an alloy made by combining copper and zinc, which means it is a mixture, not a pure substance.
Oxygen gas (O_2) consists of only one type of molecule, oxygen molecules, making it a pure substance.
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