Multiple Choice
Which of the following best describes the difference between a heterogeneous mixture and a homogeneous mixture?
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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
Pure water (H_2O)
B
Gold (Au)
C
Sodium chloride (NaCl)
D
Air
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 without fixed proportions.
Identify the nature of each option: Pure water (H\_2O) is a compound with a fixed chemical formula, so it is a pure substance.
Gold (Au) is an element, consisting of only one type of atom, 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 as well.
Air is a combination of different gases (mainly nitrogen, oxygen, and small amounts of other gases) physically mixed together without fixed proportions, so it is an example of a mixture.
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