Multiple Choice
Which of the following compounds is considered inorganic?
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3. Matter and Energy
Classification of Matter
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In the classification of matter, which of the following is classified as an element?
A
Air
B
Sodium chloride (NaCl)
C
Copper (Cu)
D
Water ()
Verified step by step guidance1
Understand the definition of an element: An element is a pure substance that consists of only one type of atom and cannot be broken down into simpler substances by chemical means.
Review each option to determine if it fits the definition of an element:
Air is a mixture of gases (mainly nitrogen, oxygen, and others), so it is not an element.
Sodium chloride (NaCl) is a compound made of sodium and chlorine atoms chemically bonded, so it is not an element.
Copper (Cu) is a pure substance made of only copper atoms, so it is classified as an element.
Water (H\2O) is a compound made of hydrogen and oxygen atoms chemically bonded, so it is not an element.
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