Multiple Choice
Which of the following is NOT a diatomic molecule?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following items is a pure substance?
A
Air
B
Brass
C
Table salt (NaCl)
D
Milk
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.
Brass is an alloy, which is a mixture of metals (mainly copper and zinc), so it is not a pure substance.
Milk is a complex mixture of water, fats, proteins, and other components, so it is not a pure substance.
Table salt (NaCl) is a chemical compound with a fixed ratio of sodium and chlorine atoms, making it a pure substance.
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