Multiple Choice
Air can be considered a mixture. Which statement best describes air?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following is an example of a mixture?
A
Air
B
Pure water (H_2O)
C
Gold (Au) bar
D
Sodium chloride (NaCl) crystal
Verified step by step guidance1
Understand the difference between a pure substance and a mixture. A pure substance has a fixed composition and distinct chemical properties, while a mixture contains two or more substances physically combined, each retaining its own properties.
Examine each option: Pure water (H_2O) is a compound with a fixed chemical formula, so it is a pure substance.
Gold (Au) bar is an element consisting of only one type of atom, so it is a pure substance.
Sodium chloride (NaCl) crystal is an ionic compound with a fixed ratio of sodium and chloride ions, so it is a pure substance.
Air is composed of multiple gases like nitrogen, oxygen, carbon dioxide, and others physically mixed together without fixed proportions, making it a mixture.
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