Multiple Choice
Copper wire is primarily made of copper. How should copper wire be classified as a type of matter?
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3. Matter and Energy
Classification of Matter
Multiple Choice
In the classification of matter, propane (C3H8) is best classified as which of the following?
A
An element
B
A pure substance that is a mixture
C
A heterogeneous mixture
D
A compound
Verified step by step guidance1
Recall the basic classifications of matter: elements, compounds, mixtures (which include homogeneous and heterogeneous mixtures).
An element consists of only one type of atom, such as oxygen (O2) or gold (Au).
A compound is a pure substance made of two or more different elements chemically bonded together in a fixed ratio, like water (H2O) or carbon dioxide (CO2).
A mixture contains two or more substances physically combined, which can be homogeneous (uniform composition) or heterogeneous (non-uniform composition).
Since propane (C3H8) consists of carbon and hydrogen atoms chemically bonded in a fixed ratio, it is best classified as a compound.
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