Britannica Sources used in this answer

How do water and hydrogen peroxide differ in their atom ratios?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

representations of molecular structure — molecule Several methods of representing a molecule's structure. In Lewis structures, element symbols represent atoms, and dots represent electrons surrounding them. A pair of shared electrons (covalent bond) may also be shown as a single dash. The ball-and-stick model better illustrates the spatial arrangement of the atoms. For aromatic compounds, the Kekulé structure is common, in which each bond is represented by a dash, carbon atoms are implied where two or more lines meet, and hydrogen atoms are usually omitted. Bond-line formulas, similar to the Kekulé structure, are often used for complex nonaromatic organic compounds. Sugars are often drawn as Fischer projections, in which the carbon “backbone” is drawn as a straight vertical line, with carbon atoms implied where horizontal lines intersect the vertical one.

Water and hydrogen peroxide differ in their atomic composition and ratios:

Water (H₂O): Each molecule consists of two hydrogen atoms bonded to one oxygen atom, resulting in a 2:1 ratio of hydrogen to oxygen atoms.1
Hydrogen Peroxide (H₂O₂): Each molecule consists of two hydrogen atoms bonded to two oxygen atoms, resulting in a 1:1 ratio of hydrogen to oxygen atoms.23

While both compounds are composed of the same elements, the additional oxygen atom in hydrogen peroxide significantly alters its chemical properties, making it a strong oxidizing agent compared to water.3