Compound Names and Formulas - Compound Names and Formulas For the ... - Free Printable

Let’s go step by step to match each compound name with its correct chemical formula.

We’ll use basic rules:
- Metals come first, then nonmetals.
- Roman numerals (like II, III) tell us the charge of the metal ion.
- Polyatomic ions (like sulfate SO₄²⁻, phosphate PO₄³⁻) have fixed formulas and charges.
- We balance charges so the total positive = total negative.

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1) NaF → Sodium fluoride
Sodium is Na⁺, Fluoride is F⁻ → 1:1 ratio → NaF ✔️

2) K₂CO₃ → Potassium carbonate
K⁺ and CO₃²⁻ → need two K⁺ to balance one CO₃²⁻ → K₂CO₃ ✔️

3) MgCl₂ → Magnesium chloride
Mg²⁺ and Cl → need two Cl⁻ → MgCl₂ ✔️

4) Be(OH)₂ → Beryllium hydroxide
Be²⁺ and OH⁻ → need two OH⁻ → Be(OH)₂ ✔️

5) SrS → Strontium sulfide
Sr²⁺ and S²⁻ → 1:1 → SrS ✔️

6) CuS → Copper(II) sulfide
Cu²⁺ and S²⁻ → 1:1 → CuS ✔️
*(Note: If it were copper(I), it would be Cu₂S — but here it's written as CuS, so must be Cu²⁺)*

7) ZnI₂ → Zinc iodide
Zn²⁺ and I⁻ → need two I⁻ → ZnI₂ ✔️

8) Ca₃(PO₄)₂ → Calcium phosphate
Ca²⁺ and PO₄³⁻ → LCM of 2 and 3 is 6 → 3 Ca²⁺ (total +6), 2 PO₄³⁻ (total -6) → Ca₃(PO)₂ ✔️

9) MnO → Manganese(II) oxide
Mn²⁺ and O²⁻ → 1:1 → MnO ✔️
*(Roman numeral II tells us Mn is +2)*

10) Mn(NO₃)₂ → Manganese(II) nitrate
Mn²⁺ and NO₃⁻ → need two NO₃⁻ → Mn(NO₃)₂ ✔️

11) FePO₄ → Iron(III) phosphate
Fe³⁺ and PO₄³⁻ → 1:1 → FePO₄ ✔️
*(Phosphate is 3-, so iron must be 3+ to balance)*

12) Co(ClO₃)₂ → Cobalt(II) chlorate
Co²⁺ and ClO₃⁻ → need two ClO₃⁻ → Co(ClO₃)₂ ✔️

13) NiSO₄ → Nickel(II) sulfate
Ni²⁺ and SO₄²⁻ → 1:1 → NiSO₄ ✔️

14) Cr₂(SO₄)₃ → Chromium(III) sulfate
Cr³⁺ and SO₄²⁻ → LCM of 3 and 2 is 6 → 2 Cr³⁺ (+6), 3 SO₄²⁻ (-6) → Cr₂(SO₄)₃ ✔️

15) Al₂(SO₄)₃ → Aluminum sulfate
Al³⁺ and SO₄²⁻ → same as above → 2 Al³⁺, 3 SO₄²⁻ → Al₂(SO₄)₃ ✔️

16) NH₄NO₃ → Ammonium nitrate
NH₄⁺ and NO₃⁻ → 1:1 → NH₄NO₃ ✔️

17) MgS → Magnesium sulfide
Mg²⁺ and S²⁻ → 1:1 → MgS ✔️

18) Cu₂S → Copper(I) sulfide
Cu⁺ and S²⁻ → need two Cu⁺ → Cu₂S ✔️

19) AlPO₄ → Aluminum phosphate
Al³⁺ and PO₄³⁻ → 1:1 → AlPO₄ ✔️

20) Pb(NO₂)₂ → Lead(II) nitrite
Pb²⁺ and NO₂⁻ → need two NO₂⁻ → Pb(NO₂)₂ ✔️
*(Nitrite is NO₂⁻, not nitrate NO₃⁻)*

21) Sn(SO₃)₂ → Tin(IV) sulfite
Sn⁴⁺ and SO₃²⁻ → need two SO₃²⁻ to make -4 → Sn(SO₃)₂ ✔️

22) AgCN → Silver cyanide
Ag⁺ and CN⁻ → 1:1 → AgCN ✔️

23) Cu(HCO₃)₂ → Copper(II) bicarbonate
Cu²⁺ and HCO₃⁻ → need two HCO₃⁻ → Cu(HCO₃)₂ ✔️

24) LiCN → Lithium cyanide
Li⁺ and CN⁻ → 1:1 → LiCN ✔️

25) Fe₂(SO₃)₃ → Iron(III) sulfite
Fe³⁺ and SO₃²⁻ → LCM of 3 and 2 is 6 → 2 Fe³⁺ (+6), 3 SO₃²⁻ (-6) → Fe₂(SO₃)₃ ✔️

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All matches are correct based on standard naming and charge balancing.

Final Answer:
The list provided already correctly pairs each compound name with its formula. No changes needed. All 25 items are accurately matched.