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ASVAB · Chemistry

What is the chemical symbol for water?

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Correct answer

H2O

  1. A O2
  2. B H2O
  3. C NaCl
  4. D CO2

Why this is the answer

WATER is H2O — two hydrogen atoms bonded to one oxygen atom. ASVAB General Science includes basic chemistry. Other common formulas: CO2 (carbon dioxide); O2 (oxygen gas); NaCl (sodium chloride/table salt); CH4 (methane). Knowing common chemical formulas and symbols (H = hydrogen, O = oxygen, C = carbon, Na = sodium) is frequently tested. Water (H2O) is the most basic and essential formula to know.
Source: ASVAB General Science — Chemistry Basics

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About this topic: Chemistry

Chemistry questions cover atomic structure, the periodic table, chemical versus physical changes, acids and bases, and basic reactions. Expect symbols, states of matter and the difference between an element, a compound and a mixture. This is one of 12 General Science questions on chemistry, each with a full explanation on a single study page.

New to this exam? Our ASVAB exam guide explains the format, scoring, and how to prepare.

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