Science quiz
Common chemical formulas
Twenty four everyday formulas, one at a time. Type the compound's name; common names count where they exist.
- Format
- Type them all
- Items
- 24 answers
- Limit
- 5:00
- Level
- Medium
- Checked
- 2026.10.03
- Answers
- 24
- Time limit
- 5:00
- Order
- One at a time, skip allowed
- Matching
- Case and accents ignored
- The highlighted slot is the one to answer.
- Prev and Next skip around; click a slot to jump to it.
- Enter on an empty box skips; the up and down arrow keys step through the slots.
- Pause whenever you like (Esc). The board hides while the clock is stopped.
Name the compound for each formula.
About this quiz
A chemical formula lists the atoms in a molecule or formula unit: H₂O is two hydrogen atoms and one oxygen atom. The small numbers count the atoms of the element before them.
- Glucose and fructose share the formula C₆H₁₂O₆ but arrange the atoms differently.
- Ozone, O₃, is made of the same atoms as the oxygen we breathe, O₂.
- Ethanol is written C₂H₅OH to show its OH group; counted up, it is C₂H₆O.
Sources
- [1]PubChem, National Institutes of Health. PubChem compound database.
Note on the data. Each name was looked up in PubChem on 3 October 2026 and its molecular formula compared with the one shown here. Formulas are written in the conventional order (NaCl, H₂SO₄), which lists the same atoms as PubChem's Hill notation. Everyday names such as table salt and baking soda are accepted.
Last checked October 3, 2026
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