객관식
In the classification of matter, which element must be present in an organic compound?
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3. Matter and Energy
Classification of Matter
객관식
In the classification of matter, table salt is primarily sodium chloride, . How is table salt best classified?
A
A heterogeneous mixture, because it has visibly different parts
B
A compound, because it consists of sodium and chlorine chemically bonded in a fixed ratio
C
An element, because it cannot be broken down into simpler substances
D
A homogeneous mixture, because it contains variable amounts of sodium and chlorine
검증된 단계별 안내1
Recall the basic classifications of matter: elements, compounds, homogeneous mixtures, and heterogeneous mixtures.
Understand that an element is a pure substance that cannot be broken down into simpler substances by chemical means.
Recognize that a compound is a pure substance composed of two or more elements chemically bonded together in a fixed ratio.
Identify that a homogeneous mixture has a uniform composition throughout but consists of physically combined substances, not chemically bonded.
Note that a heterogeneous mixture has visibly different parts or phases and is not uniform throughout.
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