Multiple Choice
Which of the following is classified as a compound?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following is classified as a compound?
A
Copper (Cu)
B
Oxygen gas (O_2)
C
Air
D
Table salt (NaCl)
Verified step by step guidance1
Step 1: Understand the definition of a compound. A compound is a substance formed when two or more different elements chemically bond together in fixed proportions.
Step 2: Analyze each option: Copper (Cu) is a pure element, not a compound, because it consists of only one type of atom.
Step 3: Oxygen gas (O_2) is a molecule made of two oxygen atoms, but since it contains only one element, it is not a compound; it is a diatomic element.
Step 4: Air is a mixture of different gases (mainly nitrogen, oxygen, and others) physically combined, so it is not a compound but a mixture.
Step 5: Table salt (NaCl) consists of sodium and chlorine atoms chemically bonded in a fixed ratio, making it a compound.
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