Multiple Choice
Which of the following is considered matter?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following are pure substances?
A
Salt water
B
Brass
C
Air
D
Oxygen gas (O_2)
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Understand the definition of a pure substance: a material that has a constant composition and distinct chemical properties. Pure substances can be elements or compounds.
Analyze salt water: it is a mixture of salt (NaCl) dissolved in water (H_2O), so it is not a pure substance but a homogeneous mixture (solution).
Analyze brass: it is an alloy made of copper and zinc, which means it is a mixture of metals, not a pure substance.
Analyze air: it is a mixture of gases such as nitrogen, oxygen, carbon dioxide, and others, so it is not a pure substance but a mixture.
Analyze oxygen gas (O_2): it is a molecule consisting of only oxygen atoms, making it a pure substance because it has a fixed composition and distinct chemical properties.
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