AP Chemistry – Nomenclature Mega Practice (120 Questions)

Section 1 Binary Ionic Compounds – Formulas → Names

Name each binary ionic compound (metal + nonmetal). Use correct spelling and “-ide” endings.

1. NaCl Show / Hide Answer sodium chloride
2. MgO Show / Hide Answer magnesium oxide
3. CaBr₂ Show / Hide Answer calcium bromide
4. Li₂S Show / Hide Answer lithium sulfide
5. KF Show / Hide Answer potassium fluoride
6. Al₂O₃ Show / Hide Answer aluminum oxide
7. Sr₃N₂ Show / Hide Answer strontium nitride
8. BaCl₂ Show / Hide Answer barium chloride
9. Rb₂O Show / Hide Answer rubidium oxide
10. CsI Show / Hide Answer cesium iodide
11. Ca₃P₂ Show / Hide Answer calcium phosphide
12. Mg₃N₂ Show / Hide Answer magnesium nitride
13. AlCl₃ Show / Hide Answer aluminum chloride
14. SrF₂ Show / Hide Answer strontium fluoride
15. Li₃N Show / Hide Answer lithium nitride

Section 2 Binary Ionic Compounds – Names → Formulas

Write the correct chemical formula for each binary ionic compound. Include subscripts where needed.

16. sodium bromide Show / Hide Answer NaBr
17. potassium oxide Show / Hide Answer K₂O
18. barium sulfide Show / Hide Answer BaS
19. aluminum nitride Show / Hide Answer AlN
20. calcium iodide Show / Hide Answer CaI₂
21. lithium phosphide Show / Hide Answer Li₃P
22. magnesium chloride Show / Hide Answer MgCl₂
23. strontium oxide Show / Hide Answer SrO
24. cesium fluoride Show / Hide Answer CsF
25. rubidium sulfide Show / Hide Answer Rb₂S

Section 3 Ionic Compounds with Polyatomic Ions

Name each ionic compound containing one or more polyatomic ions. Use standard polyatomic ion names.

26. NaNO₃ Show / Hide Answer sodium nitrate
27. KNO₂ Show / Hide Answer potassium nitrite
28. CaCO₃ Show / Hide Answer calcium carbonate
29. NaHCO₃ Show / Hide Answer sodium hydrogen carbonate (sodium bicarbonate)
30. MgSO₄ Show / Hide Answer magnesium sulfate
31. K₂SO₃ Show / Hide Answer potassium sulfite
32. NH₄Cl Show / Hide Answer ammonium chloride
33. (NH₄)₂SO₄ Show / Hide Answer ammonium sulfate
34. Na₂SO₄ Show / Hide Answer sodium sulfate
35. Li₃PO₄ Show / Hide Answer lithium phosphate
36. Ca₃(PO₄)₂ Show / Hide Answer calcium phosphate
37. Na₂CO₃ Show / Hide Answer sodium carbonate
38. Al₂(SO₄)₃ Show / Hide Answer aluminum sulfate
39. Ba(NO₃)₂ Show / Hide Answer barium nitrate
40. KClO₃ Show / Hide Answer potassium chlorate

Section 4 Transition Metal Ionic Compounds – Formulas → Names

Name each compound, including Roman numerals for variable-charge metals (stock system).

41. FeCl₂ Show / Hide Answer iron(II) chloride
42. FeCl₃ Show / Hide Answer iron(III) chloride
43. CuCl Show / Hide Answer copper(I) chloride
44. CuCl₂ Show / Hide Answer copper(II) chloride
45. SnO Show / Hide Answer tin(II) oxide
46. SnO₂ Show / Hide Answer tin(IV) oxide
47. PbS Show / Hide Answer lead(II) sulfide
48. PbS₂ Show / Hide Answer lead(IV) sulfide
49. Co(NO₃)₂ Show / Hide Answer cobalt(II) nitrate
50. Co(NO₃)₃ Show / Hide Answer cobalt(III) nitrate
51. Fe₂(SO₄)₃ Show / Hide Answer iron(III) sulfate
52. FeSO₄ Show / Hide Answer iron(II) sulfate
53. Cr₂O₃ Show / Hide Answer chromium(III) oxide
54. NiCl₂ Show / Hide Answer nickel(II) chloride
55. MnO₂ Show / Hide Answer manganese(IV) oxide

Section 5 Transition Metal Ionic Compounds – Names → Formulas

Write the formula for each compound. Pay attention to the Roman numeral indicating the metal’s oxidation state.

56. iron(III) oxide Show / Hide Answer Fe₂O₃
57. iron(II) oxide Show / Hide Answer FeO
58. copper(I) sulfate Show / Hide Answer Cu₂SO₄
59. copper(II) sulfate Show / Hide Answer CuSO₄
60. lead(IV) oxide Show / Hide Answer PbO₂
61. tin(IV) chloride Show / Hide Answer SnCl₄
62. cobalt(III) phosphate Show / Hide Answer CoPO₄
63. cobalt(II) phosphate Show / Hide Answer Co₃(PO₄)₂
64. manganese(II) nitrate Show / Hide Answer Mn(NO₃)₂
65. chromium(III) hydroxide Show / Hide Answer Cr(OH)₃

Section 6 Covalent (Molecular) Compounds

Use Greek prefixes (mono-, di-, tri-, etc.) for binary molecular compounds. No prefixes on the first element if only one, in many common names, but be consistent with your teacher’s convention.

66. CO Show / Hide Answer carbon monoxide
67. CO₂ Show / Hide Answer carbon dioxide
68. N₂O Show / Hide Answer dinitrogen monoxide (nitrous oxide)
69. NO₂ Show / Hide Answer nitrogen dioxide
70. N₂O₅ Show / Hide Answer dinitrogen pentoxide
71. SO₂ Show / Hide Answer sulfur dioxide
72. SO₃ Show / Hide Answer sulfur trioxide
73. PCl₃ Show / Hide Answer phosphorus trichloride
74. PCl₅ Show / Hide Answer phosphorus pentachloride
75. SF₆ Show / Hide Answer sulfur hexafluoride
76. dinitrogen tetrahydride Show / Hide Answer N₂H₄
77. nitrogen trichloride Show / Hide Answer NCl₃
78. carbon tetrachloride Show / Hide Answer CCl₄
79. sulfur dichloride Show / Hide Answer SCl₂
80. dichlorine monoxide Show / Hide Answer Cl₂O

Section 7 Acids – Names and Formulas

Use "hydro- ... -ic acid" for most binary acids and "-ic"/"-ous" endings based on the oxyanion name (ate → ic, ite → ous).

81. HCl(aq) Show / Hide Answer hydrochloric acid
82. HBr(aq) Show / Hide Answer hydrobromic acid
83. HI(aq) Show / Hide Answer hydroiodic acid
84. HF(aq) Show / Hide Answer hydrofluoric acid
85. H₂S(aq) Show / Hide Answer hydrosulfuric acid
86. HNO₃ Show / Hide Answer nitric acid
87. HNO₂ Show / Hide Answer nitrous acid
88. H₂SO₄ Show / Hide Answer sulfuric acid
89. H₂SO₃ Show / Hide Answer sulfurous acid
90. H₃PO₄ Show / Hide Answer phosphoric acid
91. chloric acid Show / Hide Answer HClO₃
92. chlorous acid Show / Hide Answer HClO₂
93. perchloric acid Show / Hide Answer HClO₄
94. hypochlorous acid Show / Hide Answer HClO
95. carbonic acid Show / Hide Answer H₂CO₃

Section 8 Hydrates

Name or write formulas for hydrates, using Greek prefixes for the number of water molecules (mono-, di-, tri-, etc.).

96. CuSO₄·5H₂O Show / Hide Answer copper(II) sulfate pentahydrate
97. CoCl₂·6H₂O Show / Hide Answer cobalt(II) chloride hexahydrate
98. BaCl₂·2H₂O Show / Hide Answer barium chloride dihydrate
99. CaSO₄·½H₂O Show / Hide Answer calcium sulfate hemihydrate
100. magnesium sulfate heptahydrate Show / Hide Answer MgSO₄·7H₂O

Section 9 Classification & Mixed Nomenclature Skills

For each, identify the compound type (ionic, molecular, acid, base) and/or correct any naming errors.

101. Classify and name: Na₂O Show / Hide Answer ionic; sodium oxide
102. Classify and name: N₂O₄ Show / Hide Answer molecular; dinitrogen tetroxide
103. Classify and name: H₂CO₃ Show / Hide Answer acid; carbonic acid
104. Classify and name: NH₄NO₃ Show / Hide Answer ionic; ammonium nitrate
105. Error check: “Na₂Cl is sodium dichloride.” What is wrong? Give the correct formula/name. Show / Hide Answer Na₂Cl is not charge-balanced; the correct neutral compound is NaCl, named sodium chloride.
106. Error check: “CO₂ is carbon monoxide.” Correct the name. Show / Hide Answer The correct name is carbon dioxide.
107. Classify and name: P₂O₅ Show / Hide Answer molecular; diphosphorus pentoxide
108. Classify and name: Fe(OH)₃ Show / Hide Answer ionic; iron(III) hydroxide (a base)
109. Classify and name: Ca(OH)₂ Show / Hide Answer ionic; calcium hydroxide (a base)
110. Given the name “sodium sulfite,” write the formula and classify the compound. Show / Hide Answer Na₂SO₃; ionic compound (salt)

Section 10 Basic Organic Names (Recognition Level)

Simple recognition of common organic molecules: straight-chain alkanes, common alcohols, and a simple carboxylic acid.

111. methane Show / Hide Answer CH₄
112. ethane Show / Hide Answer C₂H₆
113. propane Show / Hide Answer C₃H₈
114. butane Show / Hide Answer C₄H₁₀
115. pentane Show / Hide Answer C₅H₁₂
116. CH₃OH Show / Hide Answer methanol
117. C₂H₅OH Show / Hide Answer ethanol
118. CH₃COOH Show / Hide Answer ethanoic acid (acetic acid)
119. C₃H₇OH Show / Hide Answer propanol (commonly 1-propanol)
120. C₆H₆ Show / Hide Answer benzene

Note: Organic naming at AP level goes much deeper (functional groups, isomerism). This section is just for quick recognition.