Methanol is the substance that can be broken down by chemical means, the remaining ones are elements.
Explanation:
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Answer:
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A conjugate acid is a conjugate base with hydrogen ions attached to it. In this case, the conjugate base is the carbonate ion, CO₃⁻². This ion can have two hydrogen ions, so the conjugate acid is:
H₂CO₃
This compound is known as carbonic acid.