Multiple Choice
Which of the following best describes the properties of metalloids?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following compounds is classified as a pure substance?
A
Sea water
B
Air
C
NaCl
D
Brass
Verified step by step guidance1
Understand the definition of a pure substance: A pure substance has a uniform and definite composition, consisting of only one type of particle or compound throughout.
Analyze each option: Sea water is a mixture of water and various dissolved salts and substances, so it is not a pure substance.
Air is a mixture of different gases such as nitrogen, oxygen, carbon dioxide, and others, so it is also not a pure substance.
NaCl (sodium chloride) is a chemical compound made of sodium and chloride ions in a fixed ratio, making it a pure substance.
Brass is an alloy, which is a mixture of copper and zinc, so it is not a pure substance.
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