Chemistry worksheet for practicing naming and writing formulas of ionic compounds.

Let's solve this chemistry worksheet step by step. The task is to write the chemical formulas for the given compound names, or name the compounds based on their formulas.

We'll go through each item one by one, applying rules of ionic compound naming and formula writing:

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Rules to Remember:

1. Cations (positive ions) come first, then anions (negative ions).
2. Monatomic anions end in *-ide*.
3. Polyatomic ions have specific names (e.g., nitrate = NO₃⁻, sulfate = SO₄²⁻).
4. Transition metals with variable charges use Roman numerals to indicate oxidation state.
5. Ammonium (NH₄⁺) and hydroxide (OH⁻) are common polyatomic ions.
6. Charge balance: total positive charge must equal total negative charge.

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Solutions:

#### 1–25: Write Formulas

1. Sodium nitrate
Na⁺ and NO₃⁻ → NaNO₃

2. Calcium carbonate
Ca²⁺ and CO₃²⁻ → CaCO₃

3. Magnesium oxide
Mg²⁺ and O²⁻ → MgO

4. Ammonium sulfide
NH₄⁺ and S²⁻ → (NH₄)₂S

5. Lead (II) sulfate
Pb²⁺ and SO₄²⁻ → PbSO₄

6. Sodium cyanide
Na⁺ and CN⁻ → NaCN

7. Potassium hydroxide
K⁺ and OH⁻ → KOH

8. Silver chloride
Ag⁺ and Cl⁻ → AgCl

9. Iron (III) hydroxide
Fe³⁺ and OH⁻ → Fe(OH)₃

10. Potassium hydroxide
K⁺ and OH⁻ → KOH

11. Tin (IV) perchlorate
Sn⁴⁺ and ClO₄⁻ → Sn(ClO₄)₄

12. Potassium carbonate
K⁺ and CO₃²⁻ → K₂CO₃

13. Silver nitrate
Ag⁺ and NO₃⁻ → AgNO₃

14. Sodium iodide
Na⁺ and I⁻ → NaI

15. Ammonium hydroxide
NH₄⁺ and OH⁻ → NH₄OH

16. Potassium iodate
K⁺ and IO₃⁻ → KIO₃

17. Lead (IV) oxide
Pb⁴⁺ and O²⁻ → PbO₂

18. Ammonium hydroxide
Same as #15 → NH₄OH

19. Barium sulfate
Ba²⁺ and SO₄²⁻ → BaSO₄

20. Barium chloride
Ba²⁺ and Cl⁻ → BaCl₂

21. Cobalt (II) chloride
Co²⁺ and Cl⁻ → CoCl₂

22. Sodium carbonate
Na⁺ and CO₃²⁻ → Na₂CO₃

23. Calcium oxide
Ca²⁺ and O²⁻ → CaO

24. Lead (II) nitrate
Pb²⁺ and NO₃⁻ → Pb(NO₃)₂

25. Tin (II) chloride
Sn²⁺ and Cl⁻ → SnCl₂

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#### 26–50: Write Names

26. Aluminum chloride
Al³⁺ and Cl⁻ → AlCl₃ → Aluminum chloride

27. Iron (III) hydroxide
Fe³⁺ and OH⁻ → Fe(OH)₃ → Iron(III) hydroxide

28. Sodium acetate
Na⁺ and CH₃COO⁻ → NaCH₃COO → Sodium acetate

29. Calcium hydroxide
Ca²⁺ and OH⁻ → Ca(OH)₂ → Calcium hydroxide

30. Sodium iodate
Na⁺ and IO₃⁻ → NaIO₃ → Sodium iodate

31. Nickel (II) nitrate
Ni²⁺ and NO₃⁻ → Ni(NO₃)₂ → Nickel(II) nitrate

32. Iron (II) chloride
Fe²⁺ and Cl⁻ → FeCl₂ → Iron(II) chloride

33. Magnesium bromide
Mg²⁺ and Br⁻ → MgBr₂ → Magnesium bromide

34. Ammonium nitrate
NH₄⁺ and NO₃⁻ → NH₄NO₃ → Ammonium nitrate

35. Silver bromide
Ag⁺ and Br⁻ → AgBr → Silver bromide

36. Al(OH)₃
Al³⁺ and OH⁻ → Aluminum hydroxide → Aluminum hydroxide

37. NH₄I
NH₄⁺ and I⁻ → Ammonium iodide → Ammonium iodide

38. Li₂CO₃
Li⁺ and CO₃²⁻ → Lithium carbonate → Lithium carbonate

39. CuSO₄
Cu²⁺ and SO₄²⁻ → Copper(II) sulfate → Copper(II) sulfate

40. KCN
K⁺ and CN⁻ → Potassium cyanide → Potassium cyanide

41. Pb(ClO)₂
Pb²⁺ and ClO⁻ → Lead(II) hypochlorite → Lead(II) hypochlorite

42. BaS
Ba²⁺ and S²⁻ → Barium sulfide → Barium sulfide

43. ZnSO₄
Zn²⁺ and SO₄²⁻ → Zinc sulfate → Zinc sulfate

44. Pb(CH₃COO)₂
Pb²⁺ and CH₃COO⁻ → Lead(II) acetate → Lead(II) acetate

45. Ca(NO₃)₂
Ca²⁺ and NO₃⁻ → Calcium nitrate → Calcium nitrate

46. Fe₂(CO₃)₃
Fe³⁺ and CO₃²⁻ → Iron(III) carbonate → Iron(III) carbonate

47. NH₄I₀₃
NH₄⁺ and IO₃⁻ → Ammonium iodate → Ammonium iodate

48. CaCl₂
Ca²⁺ and Cl⁻ → Calcium chloride → Calcium chloride

49. NaF
Na⁺ and F⁻ → Sodium fluoride → Sodium fluoride

50. Cu(NO₃)₂
Cu²⁺ and NO₃⁻ → Copper(II) nitrate → Copper(II) nitrate

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✔ Final Answer Table:

| Number | Compound Name / Formula | Answer |
|--------|-------------------------|--------|
| 1 | Sodium nitrate | NaNO₃ |
| 2 | Calcium carbonate | CaCO₃ |
| 3 | Magnesium oxide | MgO |
| 4 | Ammonium sulfide | (NH₄)₂S |
| 5 | Lead (II) sulfate | PbSO₄ |
| 6 | Sodium cyanide | NaCN |
| 7 | Potassium hydroxide | KOH |
| 8 | Silver chloride | AgCl |
| 9 | Iron (III) hydroxide | Fe(OH)₃ |
| 10 | Potassium hydroxide | KOH |
| 11 | Tin (IV) perchlorate | Sn(ClO₄)₄ |
| 12 | Potassium carbonate | K₂CO₃ |
| 13 | Silver nitrate | AgNO₃ |
| 14 | Sodium iodide | NaI |
| 15 | Ammonium hydroxide | NH₄OH |
| 16 | Potassium iodate | KIO₃ |
| 17 | Lead (IV) oxide | PbO₂ |
| 18 | Ammonium hydroxide | NH₄OH |
| 19 | Barium sulfate | BaSO₄ |
| 20 | Barium chloride | BaCl₂ |
| 21 | Cobalt (II) chloride | CoCl₂ |
| 22 | Sodium carbonate | Na₂CO₃ |
| 23 | Calcium oxide | CaO |
| 24 | Lead (II) nitrate | Pb(NO₃)₂ |
| 25 | Tin (II) chloride | SnCl₂ |
| 26 | Aluminum chloride | AlCl₃ |
| 27 | Iron (III) hydroxide | Fe(OH)₃ |
| 28 | Sodium acetate | NaCH₃COO |
| 29 | Calcium hydroxide | Ca(OH)₂ |
| 30 | Sodium iodate | NaIO₃ |
| 31 | Nickel (II) nitrate | Ni(NO₃)₂ |
| 32 | Iron (II) chloride | FeCl₂ |
| 33 | Magnesium bromide | MgBr₂ |
| 34 | Ammonium nitrate | NH₄NO₃ |
| 35 | Silver bromide | AgBr |
| 36 | Al(OH)₃ | Aluminum hydroxide |
| 37 | NH₄I | Ammonium iodide |
| 38 | Li₂CO₃ | Lithium carbonate |
| 39 | CuSO₄ | Copper(II) sulfate |
| 40 | KCN | Potassium cyanide |
| 41 | Pb(ClO)₂ | Lead(II) hypochlorite |
| 42 | BaS | Barium sulfide |
| 43 | ZnSO₄ | Zinc sulfate |
| 44 | Pb(CH₃COO)₂ | Lead(II) acetate |
| 45 | Ca(NO₃)₂ | Calcium nitrate |
| 46 | Fe₂(CO₃)₃ | Iron(III) carbonate |
| 47 | NH₄IO₃ | Ammonium iodate |
| 48 | CaCl₂ | Calcium chloride |
| 49 | NaF | Sodium fluoride |
| 50 | Cu(NO₃)₂ | Copper(II) nitrate |

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📝 Notes:

- Some entries like #15 and #18 are repeated.
- #47: Corrected from "NH₄I₀₃" to NH₄IO₃ (iodate is IO₃⁻).
- #41: ClO⁻ is hypochlorite, not chlorate (which is ClO₃⁻).

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