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Media that contain at least one ingredient that is not chemically definable are called:
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1. Intro to General Chemistry
Classification of Matter
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Which of the following best describes grain alcohol (ethanol) in terms of classification of matter?
A
It is an element.
B
It is a heterogeneous mixture.
C
It is a pure substance.
D
It is a homogeneous mixture.
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Recall the basic classifications of matter: elements, compounds, homogeneous mixtures, and heterogeneous mixtures.
Understand that an element consists of only one type of atom, while a compound consists of two or more elements chemically combined in a fixed ratio.
Recognize that mixtures (both homogeneous and heterogeneous) contain two or more substances physically combined, not chemically bonded.
Identify ethanol (grain alcohol) as a compound because it is chemically composed of carbon, hydrogen, and oxygen atoms in a fixed ratio (C2H5OH).
Since ethanol is a single chemical substance with uniform composition throughout, it is classified as a pure substance, not a mixture or element.
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