Multiple Choice
Which type of mixture best describes steel?
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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
Salt water
B
Brass
C
Air
D
Oxygen gas (O_2)
Verified step by step guidance1
Understand the definition of a pure substance: a material that has a constant composition and distinct chemical properties. It can be either an element or a compound.
Analyze each option to determine if it is a pure substance or a mixture. Salt water is a homogeneous mixture of salt and water, so it is not pure.
Brass is an alloy, which is a mixture of metals (mainly copper and zinc), so it is not a pure substance.
Air is a mixture of gases (mainly nitrogen, oxygen, and other gases), so it is not a pure substance.
Oxygen gas (O_2) is a molecule consisting of only one type of element, oxygen, making it a pure substance.
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