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Which statement best describes an element in the classification of matter?
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3. Matter and Energy
Classification of Matter
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In the classification of matter, which statement best defines a compound?
A
A physical blend of two or more substances with variable composition
B
A substance composed of only one type of atom
C
A homogeneous mixture that cannot be separated by physical means
D
A pure substance made of two or more different elements chemically bonded in fixed proportions
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Understand the classification of matter, which includes elements, compounds, and mixtures.
Recall that an element is a pure substance made of only one type of atom.
Recognize that a mixture is a physical blend of two or more substances that can have variable composition and can be separated by physical means.
Identify that a compound is a pure substance composed of two or more different elements chemically bonded together in fixed proportions.
Conclude that the best definition of a compound is: a pure substance made of two or more different elements chemically bonded in fixed proportions.
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