Multiple Choice
Which of the following substances is classified as an inorganic compound?
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1. Intro to General Chemistry
Classification of Matter
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In the classification of matter, which of the following is considered a pure substance?
A
Seawater
B
Oxygen gas (O_2)
C
Air
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: Seawater is a mixture of water and dissolved salts, so it is not a pure substance.
Air is a mixture of different gases (mainly nitrogen, oxygen, and others), so it is not a pure substance.
Brass is an alloy, which is a mixture of metals (mainly copper and zinc), so it is not a pure substance.
Oxygen gas (O\_2) is composed of only one type of molecule, making it a pure substance because it has a fixed composition and uniform properties.
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