Multiple Choice
Which of the following is the most abundant gas in Earth's atmosphere?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following best describes compounds?
A
Mixtures of two or more substances that can be separated by physical means
B
Substances composed of two or more elements chemically combined in fixed proportions
C
Homogeneous mixtures with variable composition
D
Pure substances consisting of only one type of atom
Verified step by step guidance1
Understand the definition of a compound: A compound is a substance formed when two or more elements are chemically combined in fixed proportions.
Recognize that compounds differ from mixtures because compounds have chemical bonds holding the elements together, whereas mixtures are physical combinations that can be separated by physical means.
Note that mixtures can be homogeneous or heterogeneous and have variable composition, but compounds have a definite, fixed composition.
Recall that pure substances consisting of only one type of atom are elements, not compounds.
Therefore, the best description of compounds is: substances composed of two or more elements chemically combined in fixed proportions.
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