Multiple Choice
In what type of mixture are the substances evenly distributed throughout the mixture?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following is an example of a pure substance?
A
NaCl (table salt)
B
Air
C
Brass
D
Sea 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 can be either an element or a compound, but not a mixture.
Analyze each option to determine if it is a pure substance or a mixture:
Air is a mixture of gases (mainly nitrogen, oxygen, and other gases) and does not have a fixed composition, 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.
Sea water is a mixture of water, salts, and other dissolved substances, so it is not a pure substance.
NaCl (table salt) is a chemical compound with a fixed composition of sodium and chlorine atoms, making it a pure substance.
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