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Which of the following substances is a compound?
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3. Matter and Energy
Classification of Matter
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In the context of classifying matter, which element is the primary component of most fossil fuels (coal, petroleum, and natural gas)?
A
Oxygen (O)
B
Chlorine (Cl)
C
Sodium (Na)
D
Carbon (C)
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Understand that fossil fuels such as coal, petroleum, and natural gas are primarily composed of organic compounds.
Recall that organic compounds are mainly made up of carbon atoms bonded with hydrogen and sometimes other elements.
Recognize that among the given options (Oxygen, Chlorine, Sodium), carbon is the key element that forms the backbone of these organic molecules.
Note that oxygen, chlorine, and sodium are not the primary elements in fossil fuels; instead, carbon's ability to form long chains and rings makes it the main component.
Conclude that carbon (C) is the primary element in most fossil fuels due to its central role in organic chemistry and energy-rich compounds.
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