Chemical nomenclature worksheet for naming and writing formulas of inorganic compounds.

Let’s go through each item one by one. We’ll match the chemical formula to its name, or the name to its formula — whichever is asked.

We need to remember:
- For ionic compounds: metal + nonmetal (or polyatomic ion). Use Roman numerals for metals that can have more than one charge (like iron, copper, lead, etc.).
- For acids: if it says “(aq)”, it’s an acid. “Hydro...” usually means binary acid (H + nonmetal), and “...ic acid” often comes from “...ate” ions.
- For covalent compounds (nonmetals only): use prefixes like mono-, di-, tri-, tetra-, penta-, etc. (but skip “mono-” on first element).

Let’s solve them:

1. Al(C₂H₃O₂)₃ → Aluminum acetate
(Al³⁺ and C₂H₃O₂⁻ = acetate)

2. Mn(NO₃)₂ → Manganese(II) nitrate
(Mn²⁺ because NO₃⁻ is -1, two of them → Mn must be +2)

3. NaHCO₃ → Sodium bicarbonate (or sodium hydrogen carbonate)

4. (NH₄)₂S → Ammonium sulfide

5. HgI₂ → Mercury(II) iodide
(Hg can be +1 or +2; here I is -1 × 2 → Hg is +2)

6. Hg₂Br₂ → Mercury(I) bromide
(Hg₂²⁺ is a special ion — mercury(I) is always Hg₂²⁺)

7. K₃AsO₄ → Potassium arsenate
(AsO₄³⁻ is arsenate, similar to phosphate)

8. ZnS → Zinc sulfide
(Zinc is always +2, so no Roman numeral needed)

9. Ti₂O₃ → Titanium(III) oxide
(O is -2 × 3 = -6; two Ti atoms → each is +3)

10. Cr(NO₂)₃ → Chromium(III) nitrite
(NO₂⁻ is nitrite; three of them → Cr is +3)

11. Mg₃(PO₄)₂ → Magnesium phosphate

12. Cr(HSO₄)₂ → Chromium(II) bisulfate (or chromium(II) hydrogen sulfate)
(HSO₄⁻ is bisulfate/hydrogen sulfate; two of them → Cr is +2)

13. Sn(CN)₂ → Tin(II) cyanide
(CN⁻ is cyanide; two of them → Sn is +2)

14. Zn(C₂H₃O₂)₂ → Zinc acetate

15. K₂O → Potassium oxide

16. LiSCN → Lithium thiocyanate

17. Cu(OH)₂ → Copper(II) hydroxide
(OH⁻ is -1 × 2 → Cu is +2)

18. H₃PO₄(aq) → Phosphoric acid
(from phosphate PO₄³⁻ → phosphoric acid)

19. NiCr₂O₇ → Nickel dichromate? Wait — actually, Cr₂O₇²⁻ is dichromate. So Ni²⁺ + Cr₂O₇²⁻ → Nickel(II) dichromate

20. Ag₂S → Silver sulfide
(Silver is almost always +1, so no Roman numeral)

21. Mg(SCN)₂ → Magnesium thiocyanate

22. Li₂S₂O₃ → Lithium thiosulfate

23. CdC₂O₄ → Cadmium oxalate
(C₂O₄²⁻ is oxalate)

24. NH₄ClO → Ammonium chlorate

25. AgBr → Silver bromide

26. HClO(aq) → Hypochlorous acid
(ClO⁻ is hypochlorite → hypochlorous acid)

27. silver cyanide → AgCN

28. cobalt(II) bisulfate → Co(HSO₄)₂
(bisulfate = HSO₄⁻; Co²⁺ needs two)

29. copper(II) nitrite → Cu(NO₂)₂

30. magnesium carbonate → MgCO₃

31. lead(II) bromide → PbBr₂

32. stannous iodide → SnI₂
(“stannous” = tin(II))

33. hydrogen sulfide → H₂S
(gas form; not aqueous acid — though sometimes called hydrosulfuric acid when dissolved)

34. iron(III) sulfate → Fe₂(SO₄)₃
(Fe³⁺ and SO²⁻ → cross charges: Fe₂(SO₄)₃)

35. potassium phosphate → K₃PO₄

36. strontium hydroxide → Sr(OH)₂

37. copper(II) phosphate → Cu₃(PO₄)₂
(Cu²⁺ and PO₄³⁻ → cross: Cu₃(PO₄)₂)

38. carbon tetrabromide → CBr₄

39. nickel(II) carbonate → NiCO₃

40. phosphorus pentachloride → PCl₅

41. hydrogen gas → H₂

42. chromium(III) thiocyanate → Cr(SCN)₃

43. silicon dioxide → SiO₂

44. iron(III) phosphate → FePO₄
(Fe³⁺ and PO³⁻ → 1:1 ratio)

45. cesium peroxide → Cs₂O₂
(peroxide ion is O₂²⁻; Cs⁺ → Cs₂O₂)

46. nitric acid → HNO₃(aq)

47. calcium thiosulfate → CaS₂O₃

48. titanium(II) sulfite → TiSO₃
(Ti²⁺ and SO₃²⁻ → 1:1)

49. silver chromate → Ag₂CrO₄
(Ag⁺ and CrO₄²⁻ → Ag₂CrO₄)

50. hydrocyanic acid → HCN(aq)

51. aluminum chloride → AlCl₃

52. titanium(IV) bromide → TiBr₄
(Ti⁴⁺ and Br⁻ → TiBr₄)

Now let’s write all answers in order.

Final Answer:
1. Aluminum acetate
2. Manganese(II) nitrate
3. Sodium bicarbonate
4. Ammonium sulfide
5. Mercury(II) iodide
6. Mercury(I) bromide
7. Potassium arsenate
8. Zinc sulfide
9. Titanium(III) oxide
10. Chromium(III) nitrite
11. Magnesium phosphate
12. Chromium(II) bisulfate
13. Tin(II) cyanide
14. Zinc acetate
15. Potassium oxide
16. Lithium thiocyanate
17. Copper(II) hydroxide
18. Phosphoric acid
19. Nickel(II) dichromate
20. Silver sulfide
21. Magnesium thiocyanate
22. Lithium thiosulfate
23. Cadmium oxalate
24. Ammonium chlorate
25. Silver bromide
26. Hypochlorous acid
27. AgCN
28. Co(HSO₄)₂
29. Cu(NO₂)₂
30. MgCO₃
31. PbBr₂
32. SnI₂
33. H₂S
34. Fe₂(SO₄)₃
35. K₃PO₄
36. Sr(OH)₂
37. Cu₃(PO₄)₂
38. CBr₄
39. NiCO₃
40. PCl₅
41. H₂
42. Cr(SCN)₃
43. SiO₂
44. FePO₄
45. Cs₂O₂
46. HNO₃
47. CaS₂O₃
48. TiSO₃
49. Ag₂CrO₄
50. HCN
51. AlCl₃
52. TiBr₄