Multiple Choice
Which of the following best describes coffee in terms of the classification of matter?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following substances is a mixture?
A
Carbon dioxide (CO2)
B
Distilled water (H2O)
C
Air
D
Sodium chloride (NaCl)
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: Carbon dioxide (CO2) is a compound with a fixed chemical formula, so it is a pure substance.
Distilled water (H2O) is chemically pure water, meaning it contains only H2O molecules, so it is also a pure substance.
Sodium chloride (NaCl) is an ionic compound with a fixed ratio of sodium and chloride ions, making it a pure substance.
Air is a combination of different gases (mainly nitrogen, oxygen, and small amounts of other gases) physically mixed together without chemical bonding, so it is a mixture.
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