Multiple Choice
Which of the following categories includes all others in the list?
1. Intro to General Chemistry
Classification of Matter
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Which of the following is an example of a pure substance?
A
Air
B
Saltwater
C
Sand
D
Carbon dioxide
Verified step by step guidance1
Understand the definition of a pure substance: A pure substance is a form of matter that has a constant composition and properties throughout. It can be an element or a compound.
Identify the options given: Air, Saltwater, Sand, and Carbon dioxide.
Analyze each option: Air is a mixture of gases, Saltwater is a mixture of salt and water, Sand is a mixture of different minerals, and Carbon dioxide is a compound with a fixed chemical formula \( \text{CO}_2 \).
Determine which option fits the definition of a pure substance: Since Carbon dioxide has a fixed composition and distinct chemical properties, it is a pure substance.
Conclude that Carbon dioxide is the correct example of a pure substance among the given options.
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