Multiple Choice
Which of the following is an example of a mixture?
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1. Intro to General Chemistry
Classification of Matter
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How does the composition of a pure compound differ from that of a mixture?
A
A pure compound has a fixed and definite composition, while a mixture has a variable composition.
B
Both a pure compound and a mixture have variable compositions.
C
A pure compound can be separated by physical means, while a mixture cannot.
D
A pure compound contains only one type of atom, while a mixture contains two or more types of atoms.
Verified step by step guidance1
Understand the definition of a pure compound: it is a substance made up of two or more elements chemically combined in a fixed ratio, giving it a definite and constant composition.
Recognize that a mixture consists of two or more substances physically combined, where the proportions of the components can vary without a fixed ratio.
Note that because of the fixed ratio in a pure compound, its composition is always the same regardless of the sample size or source.
In contrast, the composition of a mixture can change depending on how much of each component is present, so it does not have a definite composition.
Therefore, the key difference is that a pure compound has a fixed and definite composition, while a mixture has a variable composition.
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