Multiple Choice
Which of the following samples is a pure substance?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following substances is classified as a mixture?
A
Gasoline
B
Aluminum (Al)
C
Carbon dioxide (CO_2)
D
Table salt (NaCl)
Verified step by step guidance1
Understand the difference between pure substances and mixtures. Pure substances have a fixed composition and distinct chemical properties, while mixtures contain two or more substances physically combined without fixed proportions.
Identify the nature of each option: Aluminum (Al) is an element, which is a pure substance made of only one type of atom.
Carbon dioxide (CO_2) and table salt (NaCl) are compounds, which are pure substances composed of two or more elements chemically bonded in fixed ratios.
Gasoline is a mixture because it consists of many different hydrocarbons physically combined, and its composition can vary.
Therefore, classify gasoline as the mixture among the options, while the others are pure substances.
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