Multiple Choice
Brass is an alloy made of two different metals. Which of the following pairs of metals are found in brass?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following containers holds a pure substance?
A
A container filled with air
B
A container filled with sand and iron filings
C
A container filled with saltwater
D
A container filled with distilled water (H_2O)
Verified step by step guidance1
Understand the definition of a pure substance: it is a material that has a constant composition and distinct chemical properties throughout, consisting of only one type of particle or compound.
Analyze each container's contents: air is a mixture of gases, sand and iron filings is a heterogeneous mixture of solids, saltwater is a homogeneous mixture (solution) of salt dissolved in water.
Recognize that distilled water (H_2O) is composed of only one type of molecule, with no other substances mixed in, making it a pure substance.
Conclude that among the options, only the container filled with distilled water meets the criteria of a pure substance.
Summarize that mixtures (air, sand with iron filings, saltwater) are not pure substances because they contain more than one component, whereas distilled water is a pure substance.
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