Nomenclature Quiz
Questions: 16 · 10 minutes
1. A compound list includes the condensed structural formula CH₃CH₂OH. Which introductory organic name matches its two-carbon alcohol structure?
Methanol
Ethanal
Ethanoic acid
Ethanol
2. A reagent list requests calcium nitrate. Which formula represents one calcium ion paired with two nitrate ions?
CaNO₂ — one calcium with one nitrite
Ca(NO₃)₂ — one calcium with two nitrates
Ca(NO₂)₂ — one calcium with two nitrites
Ca₂NO₃ — two calciums with one nitrate
3. Translate the molecular-compound name dinitrogen pentoxide into its formula.
NO₅ — one nitrogen atom and five oxygen atoms
N₂O₅ — two nitrogen atoms and five oxygen atoms
N₅O₂ — five nitrogen atoms and two oxygen atoms
N₂O₄ — two nitrogen atoms and four oxygen atoms
4. A worksheet calls Mg(OH)₂ “magnesium dihydroxide.” Which corrected name follows ionic-compound conventions?
Magnesium hydroxide
Magnesium hydrogen oxide
Magnesium oxide
Magnesium(II) hydride
5. To prepare cobalt(II) nitrate, a technician must pair Co²⁺ with enough NO₃⁻ ions to make a neutral compound. Which formula is required?
Co(NO₃)₂ — one cobalt ion with two nitrate ions
CoNO₃ — one cobalt ion with one nitrate ion
Co₂(NO₃)₃ — two cobalt ions with three nitrate ions
Co(NO₂)₂ — one cobalt ion with two nitrite ions
6. The formula CuSO₄·5H₂O appears on a container of hydrated crystals. Which label accounts for both the copper charge and five waters of hydration?
Copper(II) sulfate pentahydrate
Copper(I) sulfate pentahydrate
Copper(II) sulfite tetrahydrate
Copper sulfate hexahydrate
7. Chromate is CrO₄²⁻, whereas dichromate is Cr₂O₇²⁻. How should K₂Cr₂O₇ be identified?
Potassium chromate
Potassium(II) dichromate
Potassium dichromate
Dipotassium chromium heptoxide
8. Because each chloride ion has a −1 charge, iron has a +3 charge in FeCl₃. Which name communicates this correctly?
Iron(II) chloride
Iron(III) chloride
Iron(III) chlorate
Iron trichlorate
9. An aqueous bottle bears the formula H₂SO₃(aq). Which acid name should be used?
Persulfuric acid
Sulfuric acid
Hydrosulfuric acid
Sulfurous acid
10. Which formula-and-state notation identifies hydroiodic acid rather than an iodine oxyacid?
HI(aq) — hydrogen iodide dissolved in water
HIO₂(aq) — the acid derived from iodite
HIO₃(aq) — the acid derived from iodate
HIO(aq) — the acid derived from hypoiodite
11. A stockroom inventory lists Na₂SO₄. Which label belongs on this ionic compound?
Sodium sulfite
Disodium sulfur oxide
Sodium sulfate
Sodium sulfide
12. Aluminum ions are Al³⁺ and sulfate ions are SO₄²⁻. Which formula balances their charges in the smallest whole-number ratio?
AlSO₄ — one aluminum ion per sulfate ion
Al(SO₄)₃ — one aluminum ion per three sulfate ions
Al₃(SO₄)₂ — three aluminum ions per two sulfate ions
Al₂(SO₄)₃ — two aluminum ions per three sulfate ions
13. A student combines ammonium, NH₄⁺, with phosphate, PO₄³⁻. Which neutral formula should the student write?
NH₄PO₄ — a one-to-one ion ratio
(NH₄)₂PO₄ — two ammonium ions per phosphate
NH₄(PO₄)₃ — one ammonium ion per three phosphates
(NH₄)₃PO₄ — three ammonium ions per phosphate
14. In Cu₂O, oxide contributes a total charge of −2, so each copper ion is +1. Select the corresponding name.
Copper(II) oxide
Copper(I) peroxide
Copper(I) oxide
Dicopper dioxide
15. Apply covalent-prefix rules to N₂O₄, including the conventional vowel contraction in the second element’s prefix.
Nitrogen tetroxide
Dinitrogen tetroxide
Nitrogen(IV) oxide
Dinitrogen dioxide
16. Which label applies molecular-prefix rules correctly to PCl₃?
Monophosphorus chloride
Phosphorus(III) chlorate
Phosphorus trichloride
Phosphorus chloride trioxide