Practice worksheets for naming ionic compounds and writing their chemical formulas.

Let's solve this step-by-step. The worksheet has two main sections:

1. Naming ionic compounds (given formulas → names)
2. Writing formulas (given names → formulas)

We'll go through each part, applying the rules for naming and writing ionic compounds.

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✔ Section 1: Name the following ionic compounds

#### Left Column:
1) NH₄Cl
- NH₄⁺ is ammonium (polyatomic cation), Cl⁻ is chloride
→ Ammonium chloride

2) Fe(NO₃)₃
- Fe is iron; it has variable charge. NO₃⁻ is nitrate (charge = -1). Three nitrates → total anion charge = -3 → Fe must be +3
→ Iron(III) nitrate

3) TiBr₃
- Ti is titanium; Br⁻ is bromide. Three Br⁻ → charge = -3 → Ti must be +3
→ Titanium(III) bromide

4) Cu₃P
- Cu is copper; P³⁻ is phosphide. Three Cu atoms balance one P³⁻ → total charge = +3 → each Cu = +1
→ Copper(I) phosphide

5) SnSe₂
- Sn is tin; Se²⁻ is selenide. Two Se²⁻ → -4 charge → Sn must be +4
→ Tin(IV) selenide

6) GaAs
- Ga is gallium; As is arsenide. Both form ions: Ga³⁺ and As³⁻
→ Gallium arsenide (no Roman numeral needed; fixed charges)

7) Pb(SO₄)₂
- Pb is lead; SO₄²⁻ is sulfate. Two sulfates → -4 charge → Pb = +4
→ Lead(IV) sulfate

8) Be(HCO₃)₂
- Be²⁺ is beryllium; HCO₃⁻ is bicarbonate
→ Beryllium bicarbonate

9) Mn₂(SO₃)₃
- Mn is manganese; SO₃²⁻ is sulfite. Three sulfites → -6 charge → two Mn atoms → each Mn = +3
→ Manganese(III) sulfite

10) Al(CN)₃
- Al³⁺ is aluminum; CN⁻ is cyanide
→ Aluminum cyanide

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#### Right Column:

1) NaBr
- Na⁺ is sodium; Br⁻ is bromide
→ Sodium bromide

2) Sc(OH)₃
- Sc is scandium; OH⁻ is hydroxide. Three OH⁻ → -3 → Sc = +3
→ Scandium(III) hydroxide

3) V₂(SO₄)₃
- V is vanadium; SO₄²⁻ is sulfate. Three SO₄²⁻ → -6 → two V atoms → each V = +3
→ Vanadium(III) sulfate

4) NH₄F
- NH₄⁺ is ammonium; F⁻ is fluoride
→ Ammonium fluoride

5) CaCO₃
- Ca²⁺ is calcium; CO₃²⁻ is carbonate
→ Calcium carbonate

6) NiPO₄
- Ni is nickel; PO₄³⁻ is phosphate. Charge balance: Ni²⁺ or Ni³⁺?
One PO₄³⁻ needs +3 → so Ni = +3
→ Nickel(III) phosphate

7) Li₂SO₃
- Li⁺ is lithium; SO₃²⁻ is sulfite
→ Lithium sulfite

8) Zn₃P₂
- Zn is zinc; P³⁻ is phosphide. Two P³⁻ → -6 → three Zn → each Zn = +2
→ Zinc phosphide (Zn always +2, no Roman numeral)

9) Sr(C₂H₃O₂)₂
- Sr²⁺ is strontium; C₂H₃O₂⁻ is acetate
→ Strontium acetate

10) Cu₂O
- Cu is copper; O²⁻ is oxide. Two Cu atoms balance one O²⁻ → total +2 → each Cu = +1
→ Copper(I) oxide

11) Ag₃PO₄
- Ag⁺ is silver; PO₄³⁻ is phosphate. Three Ag⁺ → +3 → balances PO₄³⁻
→ Silver phosphate (Ag always +1)

12) YClO₃
- Y is yttrium; ClO₃⁻ is chlorate. Yttrium is usually +3
→ Yttrium chlorate

13) SnS₂
- Sn is tin; S²⁻ is sulfide. Two S²⁻ → -4 → Sn = +4
→ Tin(IV) sulfide

14) Ti(CN)₄
- Ti is titanium; CN⁻ is cyanide. Four CN⁻ → -4 → Ti = +4
→ Titanium(IV) cyanide

15) KMnO₄
- K⁺ is potassium; MnO₄⁻ is permanganate
→ Potassium permanganate

16) Pb₃N₂
- Pb is lead; N³⁻ is nitride. Two N³⁻ → -6 → three Pb → each Pb = +2
→ Lead(II) nitride

17) CoCO₃
- Co is cobalt; CO₃²⁻ is carbonate. Charge = -2 → Co = +2
→ Cobalt(II) carbonate

18) CdSO₃
- Cd²⁺ is cadmium; SO₃²⁻ is sulfite
→ Cadmium sulfite

19) Cu(NO₂)₂
- Cu is copper; NO₂⁻ is nitrite. Two NO₂⁻ → -2 → Cu = +2
→ Copper(II) nitrite

20) Fe(HCO₃)₂
- Fe is iron; HCO₃⁻ is bicarbonate. Two HCO₃⁻ → -2 → Fe = +2
→ Iron(II) bicarbonate

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✔ Section 2: Write the formulas for the following compounds

11) Chromium(VI) phosphate
- Cr⁶⁺ and PO₄³⁻
- Cross charges: Cr⁶⁺ and PO₄³⁻ → LCM of 6 and 3 is 6 → Cr₂(PO₄)₃
→ Cr₂(PO₄)₃

12) Vanadium(IV) carbonate
- V⁴⁺ and CO₃²⁻
- Cross: V⁴⁺ and CO₃²⁻ → V(CO₃)₂
→ V(CO₃)₂

13) Tin(II) nitrite
- Sn²⁺ and NO₂⁻
→ Sn(NO₂)₂

14) Cobalt(III) oxide
- Co³⁺ and O²⁻
- Cross: Co₂O₃
→ Co₂O₃

15) Titanium(II) acetate
- Ti²⁺ and C₂H₃O₂⁻
→ Ti(C₂H₃O₂)₂

16) Vanadium(V) sulfide
- V⁵⁺ and S²⁻
- Cross: V₂S₅
→ V₂S₅

17) Chromium(III) hydroxide
- Cr³⁺ and OH⁻
→ Cr(OH)₃

18) Lithium iodide
- Li⁺ and I⁻
→ LiI

19) Lead(II) nitride
- Pb²⁺ and N³⁻
- Cross: Pb₃N₂
→ Pb₃N₂

20) Silver bromide
- Ag⁺ and Br⁻
→ AgBr

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✔ Final Answers

#### Name the following ionic compounds:

Left Column:
1) Ammonium chloride
2) Iron(III) nitrate
3) Titanium(III) bromide
4) Copper(I) phosphide
5) Tin(IV) selenide
6) Gallium arsenide
7) Lead(IV) sulfate
8) Beryllium bicarbonate
9) Manganese(III) sulfite
10) Aluminum cyanide

Right Column:
1) Sodium bromide
2) Scandium(III) hydroxide
3) Vanadium(III) sulfate
4) Ammonium fluoride
5) Calcium carbonate
6) Nickel(III) phosphate
7) Lithium sulfite
8) Zinc phosphide
9) Strontium acetate
10) Copper(I) oxide
11) Silver phosphate
12) Yttrium chlorate
13) Tin(IV) sulfide
14) Titanium(IV) cyanide
15) Potassium permanganate
16) Lead(II) nitride
17) Cobalt(II) carbonate
18) Cadmium sulfite
19) Copper(II) nitrite
20) Iron(II) bicarbonate

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#### Write the formulas for the following compounds:

11) Cr₂(PO₄)₃
12) V(CO₃)₂
13) Sn(NO₂)₂
14) Co₂O₃
15) Ti(C₂H₃O₂)₂
16) V₂S₅
17) Cr(OH)₃
18) LiI
19) Pb₃N₂
20) AgBr

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✔ Summary of Key Rules Used:
- Fixed charge metals: Group 1, 2, Al, Zn, Ag, Cd → no Roman numerals
- Variable charge metals: Use Roman numerals to indicate oxidation state
- Polyatomic ions: Know common ones (e.g., NO₃⁻, SO₄²⁻, PO₄³⁻, OH⁻, CN⁻, HCO₃⁻, etc.)
- Charge balancing: Total positive charge = total negative charge
- Crossing charges: For formula writing, use criss-cross method (simplify if possible)

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