Multiple Choice
Which of the following is NOT an example of a compound?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following is NOT a physical mixture?
A
Salt water
B
Carbon dioxide (CO_2)
C
Sand and iron filings
D
Air
Verified step by step guidance1
Step 1: Understand the definition of a physical mixture. A physical mixture consists of two or more substances combined physically, where each substance retains its own chemical identity and properties.
Step 2: Analyze each option to determine if it is a physical mixture or a pure substance. For example, salt water is a mixture of salt and water physically combined.
Step 3: Consider sand and iron filings, which are physically combined solids and can be separated by physical means, so this is a physical mixture.
Step 4: Air is a mixture of gases (mainly nitrogen, oxygen, and other gases) physically combined, so it is also a physical mixture.
Step 5: Carbon dioxide (CO_2) is a chemical compound with a fixed chemical formula and structure, not a mixture. Therefore, it is NOT a physical mixture.
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