Multiple Choice
Which of the following statements about air is correct?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following is a pure substance?
A
Salt water
B
Gasoline
C
Carbon dioxide
D
Soda
Verified step by step guidance1
Understand the definition of a pure substance: A pure substance has a fixed composition and distinct chemical properties. It consists of only one type of particle, either an element or a compound.
Analyze each option to determine if it meets the criteria of a pure substance:
Salt water is a mixture of salt (NaCl) dissolved in water (H2O), so it is not a pure substance.
Gasoline is a complex mixture of hydrocarbons, so it is not a pure substance.
Carbon dioxide (CO2) is a chemical compound with a fixed composition and uniform properties, making it a pure substance.
Soda is a mixture of water, dissolved gases, sugars, and other ingredients, so it is not a pure substance.
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