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Chemical Formulas and Compounds Quiz

Test your knowledge of chemical formulas and compounds with this interactive quiz. Identify correct chemical formulas and compound names for various elements and ions.

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Chemical Formulas and Compounds Quiz

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  1. Question • ______ form ions with a 2+ charge when they react with nonmetals. a) Group IA elements b) Group IIA elements c) Group VIIA elements d) Group VIIIA elements e) None of the above

  2. Answer • b) Group IIA elements • Group IIA elements form ions with 2+ charge and combine with nonmetals in binary compounds.

  3. Question • Which is not the correct chemical formula for the compound named? a) Potassium phosphate, K3PO4 b) Iron(II) oxide, FeO c) Calcium carbonate, CaCO3 d) Sodium sulfide, NaS e) Lithium nitrate, LiNO3

  4. Answer • d) Sodium sulfide, NaS • Sodium sulfide is a binary compound composed of a Group IA element whose charge in compounds is +1 and a Group VIA element whose charge in binary compounds is commonly –2. This means that two sodium ions must be combined with one sulfide ion for a neutral compound.

  5. Question • Which of the following is not the correct chemical formula for the compound named? • Li2O, lithium oxide • FePO4, iron(III) phosphate • HF, hydrogen fluoride • BaCl2, barium dichloride • Mg3N2, magnesium nitride

  6. Answer • d) BaCl2, barium dichloride • The binary compound, BaCl2, is composed of a metal and a nonmetal. Since barium forms only one ion, the name is barium chloride (no prefix is needed).

  7. Question • Which is the correct formula for copper(I) sulfide? a) CuS b) Cu2S c) CuS2 d) Cu2S2 e) None of the above

  8. Answer • b) Cu2S • The copper(I) ion has a +1 charge and the sulfide ion has a −2 charge.

  9. Question • Which of the following is the correct chemical formula for iron(III) oxide? a) FeO b) Fe3O c) FeO3 d) Fe3O2 e) Fe2O3

  10. Answer • e) Fe2O3 • The iron(III) ion has a +3 charge and the oxide ion has a −2 charge.

  11. Question • What is the correct name for this compound with the formula Mg3(PO4)2? a) Trimagnesium diphosphate b) Magnesium(II) phosphate c) Magnesium phosphate d) Magnesium(II) diphosphate e) Magnesium(III) diphosphate

  12. Answer • c) Magnesium phosphate • The magnesium ion has only one possible charge (a +2 charge) and the phosphate ion has a −3 charge.

  13. Question • What is the correct name for this compound with the formula CS2? a) Monocarbon disulfide b) Carbon disulfur c) Carbon disulfide d) Carbon sulfide e) Carbon(VI) sulfide

  14. Answer • c) Carbon disulfide • There is one carbon, but the mono- prefix is not used for the first element. There are two sulfur atoms, so a di- prefix is used. The name ends with an -ide ending.

  15. Question • What is the correct formula for hypobromous acid? a) HBr b) HBrO c) HBrO2 d) HBrO3 e) HBrO4

  16. Answer • b) HBrO • HBrO3 is bromic acid. • Removing one O gives HBrO2 or bromous acid. • Removing one more O gives HBrO or hypobromous acid. • Removing the last O gives HBr or hydrobromic acid.

  17. Question • What is the correct formula for the compound barium hydroxide octahydrate? a) BaOH b) Ba(OH)2 c) Ba(OH)2. 8H2O d) Ba(OH)2(H2O)8 e) BaOH . 8H2O

  18. Answer • c) Ba(OH)2. 8H2O • The barium ion has a charge of +2, so there are two hydroxide groups in the formula. Waters of hydration are written at the end of the formula separated by a dot, with the number of waters of hydration defined using Greek prefixes.

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