Chemistry Regents Practice Test 2025 – Complete Prep Resource

Question: 1 / 400

What is the chemical formula for water?

CO₂

H₂O

The chemical formula for water is H₂O. This formula signifies that each molecule of water is composed of two hydrogen atoms (H) bonded to one oxygen atom (O). The subscript ‘2’ indicates the number of hydrogen atoms, while the absence of a subscript next to oxygen implies there is one oxygen atom in each molecule. This fundamental formula is pivotal in chemistry as it represents the simplest form of water, which is essential for life, involved in various chemical reactions, and serves as a universal solvent. The other choices represent different compounds: CO₂ is carbon dioxide, NaCl is sodium chloride (table salt), and H₂O₂ is hydrogen peroxide, each serving distinct roles in chemistry.

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NaCl

H₂O₂

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