Multiple Choice
How many oxygen atoms are present in one molecule of hydrogen peroxide (H2O2)?
3. Chemical Reactions
Molecular Formula
Multiple Choice
Which of the following correctly describes the atoms and their quantities in a water (H_2O) molecule?
A
1 hydrogen atom and 1 oxygen atom
B
1 hydrogen atom and 2 oxygen atoms
C
2 hydrogen atoms and 1 oxygen atom
D
2 oxygen atoms and 2 hydrogen atoms
Verified step by step guidance1
Identify the chemical formula of water, which is H_2O.
Understand that the subscript number in a chemical formula indicates the number of atoms of that element in one molecule.
In H_2O, the subscript '2' after hydrogen (H) means there are 2 hydrogen atoms.
There is no subscript after oxygen (O), which means there is 1 oxygen atom.
Therefore, a water molecule contains 2 hydrogen atoms and 1 oxygen atom.
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