Multiple Choice
Which element is present in almost every compound in the human body?
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3. Matter and Energy
Classification of Matter
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Which element must be present in an organic compound?
A
Carbon (C)
B
Sodium (Na)
C
Calcium (Ca)
D
Neon (Ne)
Verified step by step guidance1
Understand the definition of an organic compound: Organic compounds are primarily made up of carbon atoms bonded to hydrogen, oxygen, nitrogen, and other elements.
Recall that the key characteristic of organic compounds is the presence of carbon atoms forming the backbone of the molecule.
Review the options given: Sodium (Na), Calcium (Ca), Neon (Ne), and Carbon (C). Consider which element is essential for the structure of organic molecules.
Recognize that Sodium and Calcium are metals and typically form ionic compounds, not organic compounds, and Neon is a noble gas, which is chemically inert and does not form compounds easily.
Conclude that Carbon (C) is the element that must be present in all organic compounds because it forms the covalent bonds that define organic chemistry.
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