Multiple Choice
Which type of material is defined as having a well-ordered atomic structure?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following is classified as a substance?
A
Brass
B
Air
C
Oxygen gas (O_2)
D
Salt water
Verified step by step guidance1
Understand the definition of a substance in chemistry: A substance is a form of matter that has a uniform and definite composition. It can be either an element or a compound.
Analyze each option to determine if it meets the criteria of a substance:
Brass is an alloy, which is a mixture of metals, so it does not have a uniform chemical composition and is not a pure substance.
Air is a mixture of gases (mainly nitrogen, oxygen, and others), so it is not a pure substance.
Oxygen gas (O_2) is a pure element consisting of only oxygen molecules, so it is a substance.
Salt water is a homogeneous mixture of salt (NaCl) dissolved in water (H_2O), so it is not a pure substance.
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