Multiple Choice
In the classification of matter, which of the following is NOT a compound?
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3. Matter and Energy
Classification of Matter
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Which of the following best describes a compound in the classification of matter?
A
A pure substance made of only one type of atom
B
A pure substance made of two or more different elements chemically bonded together in fixed proportions
C
A substance with variable composition that cannot be separated into simpler substances
D
A physical combination of two or more substances that can be separated by physical means
Verified step by step guidance1
Understand the classification of matter, which divides substances into pure substances and mixtures.
Recall that a pure substance has a fixed composition and distinct properties, and it can be either an element or a compound.
An element is a pure substance made of only one type of atom, while a compound is a pure substance made of two or more different elements chemically bonded together in fixed proportions.
Mixtures, on the other hand, have variable composition and can be separated by physical means; they are not chemically bonded.
Therefore, identify that the best description of a compound is a pure substance made of two or more different elements chemically bonded together in fixed proportions.
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