Multiple Choice
Which statement best explains how to distinguish between an element and a compound?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following is considered a pure substance?
A
Brass
B
Air
C
Salt water
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: Brass is an alloy (a mixture of metals), 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.
Salt water is a homogeneous mixture (solution) of salt dissolved in water, so it is not a pure substance.
Oxygen gas (O\_2) is a molecule consisting of only one type of element, making it a pure substance.
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