Match chemical names to their correct formulas in this educational worksheet.

Let’s solve this step by step.

We need to match each chemical name (from 1 to 30) with its correct chemical formula from the Formula List on the right.

We’ll go one by one, using basic chemistry rules:

- For ionic compounds: metal + nonmetal or polyatomic ion. Use charges to balance.
- For covalent compounds (nonmetals only): use prefixes like mono-, di-, tri- etc., but sometimes they’re dropped for first element.
- Roman numerals in names (like iron(II)) tell us the charge of the metal.

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Let’s start matching:

(1) sodium nitrite
Sodium = Na⁺, Nitrite = NO₂⁻ → NaNO₂

(2) copper (II) oxide
Copper(II) = Cu²⁺, Oxide = O²⁻ → CuO

(3) sodium iodide
Na⁺ + I⁻ → NaI

(4) sulfur dioxide
Covalent: S + 2 O → SO₂

(5) hydrogen sulfide
H₂S (common compound) → H₂S

(6) magnesium phosphate
Mg²⁺, Phosphate = PO₄³⁻ → Need 3 Mg and 2 PO₄ → Mg₃(PO₄)₂

(7) potassium hydrogen carbonate
K⁺ + HCO₃⁻ → KHCO₃

(8) iron(III) chloride
Fe³⁺ + Cl⁻ → FeCl₃ → FeCl₃

(9) sulphur trioxide
S + 3 O → SO₃

(10) iron(II) sulfide
Fe²⁺ + S²⁻ → FeS

(11) magnesium hydroxide
Mg²⁺ + OH⁻ → Mg(OH)₂ → Mg(OH)₂

(12) sodium bisulfate
Also called sodium hydrogen sulfate: Na⁺ + HSO₄⁻ → NaHSO₄

(13) potassium carbonate
K⁺ + CO₃²⁻ → K₂CO₃ → K₂CO₃

(14) carbon monoxide
C + O → CO

(15) magnesium hydride
Mg²⁺ + H⁻ → MgH₂ → MgH₂

(16) magnesium oxide
Mg²⁺ + O²⁻ → MgO

(17) potassium sulfate
K⁺ + SO₄²⁻ → K₂SO₄ → K₂SO₄

(18) magnesium nitride
Mg²⁺ + N³⁻ → Mg₃N₂ → Mg₃N₂

(19) sodium nitrate
Na⁺ + NO₃⁻ → NaNO₃

(20) carbon tetrachloride
C + 4 Cl → CCl₄

(21) potassium sulphite
K⁺ + SO₃²⁻ → K₂SO₃ → K₂SO₃

(22) calcium chloride
Ca²⁺ + Cl⁻ → CaCl₂ → CaCl₂

(23) sodium sulfide
Na⁺ + S²⁻ → Na₂S → Na₂S

(24) sodium iodate
Na⁺ + IO₃⁻ → NaIO₃

(25) iron (III) oxide
Fe³⁺ + O²⁻ → Fe₂O₃ → Fe₂O₃

(26) magnesium nitrate
Mg²⁺ + NO₃⁻ → Mg(NO₃)₂ → Mg(NO₃)₂

(27) sodium sulphate
Na⁺ + SO₄²⁻ → Na₂SO₄ → Na₂SO₄

(28) ammonium hydroxide
NH₄⁺ + OH⁻ → NH₄OH

(29) iron(II) sulfate
Fe²⁺ + SO₄²⁻ → FeSO₄

(30) carbon dioxide
C + 2 O → CO₂

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Now let’s write the matches in order:

1. sodium nitrite → NaNO₂
2. copper (II) oxide → CuO
3. sodium iodide → NaI
4. sulfur dioxide → SO₂
5. hydrogen sulfide → H₂S
6. magnesium phosphate → Mg₃(PO₄)₂
7. potassium hydrogen carbonate → KHCO₃
8. iron(III) chloride → FeCl₃
9. sulphur trioxide → SO₃
10. iron(II) sulfide → FeS
11. magnesium hydroxide → Mg(OH)₂
12. sodium bisulfate → NaHSO₄
13. potassium carbonate → K₂CO₃
14. carbon monoxide → CO
15. magnesium hydride → MgH₂
16. magnesium oxide → MgO
17. potassium sulfate → K₂SO₄
18. magnesium nitride → Mg₃N₂
19. sodium nitrate → NaNO₃
20. carbon tetrachloride → CCl₄
21. potassium sulphite → K₂SO₃
22. calcium chloride → CaCl₂
23. sodium sulfide → Na₂S
24. sodium iodate → NaIO₃
25. iron (III) oxide → Fe₂O₃
26. magnesium nitrate → Mg(NO₃)₂
27. sodium sulphate → Na₂SO₄
28. ammonium hydroxide → NH₄OH
29. iron(II) sulfate → FeSO₄
30. carbon dioxide → CO₂

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Final Answer:
1. NaNO₂
2. CuO
3. NaI
4. SO₂
5. H₂S
6. Mg₃(PO₄)₂
7. KHCO₃
8. FeCl₃
9. SO₃
10. FeS
11. Mg(OH)₂
12. NaHSO₄
13. K₂CO₃
14. CO
15. MgH₂
16. MgO
17. K₂SO₄
18. Mg₃N₂
19. NaNO₃
20. CCl₄
21. K₂SO₃
22. CaCl₂
23. Na₂S
24. NaIO₃
25. Fe₂O₃
26. Mg(NO₃)₂
27. Na₂SO₄
28. NH₄OH
29. FeSO₄
30. CO₂