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Which of the following is the correct chemical formula for sulfur dioxide?
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3. Chemical Reactions
Naming Molecular Compounds
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Which of the following is the correct chemical formula for hydrogen gas?
A
H_2
B
HO
C
H
D
H_2O
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Understand that hydrogen gas is a diatomic molecule, meaning it naturally exists as two hydrogen atoms bonded together.
Recall that the chemical symbol for hydrogen is H, and when two hydrogen atoms bond, the formula is written as \(H_2\) to indicate two atoms.
Recognize that \(HO\) and \(H_2O\) represent different compounds: \(HO\) is a hydroxyl radical, and \(H_2O\) is water, neither of which is hydrogen gas.
Note that a single \(H\) represents a single hydrogen atom, not the molecular form of hydrogen gas.
Conclude that the correct chemical formula for hydrogen gas is \(H_2\), reflecting its diatomic nature.
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