Ionic Covalent Name Race Academic Answers 1 .doc - Name Date ... - Free Printable

Let’s go through each compound one by one. We’ll figure out if it’s ionic (I) or covalent (C), then write the correct chemical formula.

Remember:
- Ionic compounds are usually made of a metal + nonmetal.
- Covalent compounds are usually made of two nonmetals.
- For ionic, we balance charges to get the formula.
- For covalent, we use prefixes (like di-, tri-) to know how many atoms — but here, names don’t always have prefixes, so we rely on common knowledge or valence rules.

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1. oxygen difluoride
→ Two nonmetals → Covalent (C)
→ “Di” means 2 fluorines → OF₂

2. sodium hydroxide
→ Sodium (metal) + OH (polyatomic ion) → Ionic (I)
→ Na⁺ and OH⁻ → NaOH

3. nitrogen dioxide
→ Two nonmetals → Covalent (C)
→ “Di” = 2 oxygens → NO₂

4. ammonium chloride
→ NH₄⁺ (polyatomic cation) + Cl⁻ → Ionic (I)
→ NH₄Cl

5. aluminum sulfate
→ Al³⁺ and SO₄²⁻ → need to balance charge: 2 Al³⁺ = +6, 3 SO₄²⁻ = -6 → Ionic (I)
→ Al₂(SO₄)₃

6. aluminum cyanide
→ Al³⁺ and CN⁻ → need 3 CN⁻ to balance → Ionic (I)
→ Al(CN)₃

7. silicon dioxide
→ Two nonmetals → Covalent (C)
→ SiO₂

8. tin(IV) fluoride
→ Tin is metal, F is nonmetal → Ionic (I)
→ Sn⁴⁺ and F⁻ → need 4 F → SnF₄

9. strontium nitrate
→ Sr²⁺ and NO₃⁻ → need 2 NO₃ → Ionic (I)
→ Sr(NO₃)₂

10. magnesium bromate
→ Mg²⁺ and BrO₃⁻ → need 2 BrO₃ → Ionic (I)
→ Mg(BrO₃)₂

11. selenium trioxide
→ Two nonmetals → Covalent (C)
→ “Tri” = 3 oxygens → SeO₃

12. potassium chromate
→ K⁺ and CrO₄²⁻ → need 2 K → Ionic (I)
→ K₂CrO₄

13. dichlorine heptaoxide
→ Two nonmetals → Covalent (C)
→ “Di” = 2 Cl, “hepta” = 7 O → Cl₂O₇

14. manganese (V) carbonate
→ Mn⁵⁺ and CO₃²⁻ → LCM of 5 and 2 is 10 → 2 Mn⁵⁺ = +10, 5 CO₃²⁻ = -10 → Ionic (I)
→ Mn₂(CO₃)₅

15. lead(II) sulfite
→ Pb²⁺ and SO₃²⁻ → charges cancel → Ionic (I)
→ PbSO₃

16. pentasulfur decaoxide
→ Two nonmetals → Covalent (C)
→ “Penta” = 5 S, “deca” = 10 O → S₅O₁₀

Wait — let me double-check #16. Pentasulfur decaoxide is actually S₅O₁₀? Actually, sulfur oxides are often written as S₂O₅ for disulfur pentoxide, but “pentasulfur decaoxide” literally means 5 sulfurs and 10 oxygens → S₅O₁₀. That’s acceptable, though uncommon. But in standard naming, this might be simplified — however, since the name says “penta” and “deca”, we follow that → S₅O₁₀.

Actually, wait — I think there’s a mistake. The common compound is disulfur decoxide? No — let’s think: “pentasulfur decaoxide” → Penta = 5, deca = 10 → S₅O₁₀. Yes, that’s what the name says. So we go with that.

But let me verify: In reality, sulfur forms S₂O₅ (disulfur pentoxide) and S₈O etc., but for homework purposes, if the name is given as “pentasulfur decaoxide”, we write S₅O₁₀.

Alternatively, maybe it’s a typo? But we must follow the name given.

Actually, upon second thought — “decaoxide” suggests 10 oxygen atoms, and “pentasulfur” is 5 sulfur atoms → S₅O₁₀. Correct.

Now, let’s list all answers clearly:

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Final Answer:

1. C, OF₂
2. I, NaOH
3. C, NO₂
4. I, NH₄Cl
5. I, Al₂(SO₄)₃
6. I, Al(CN)₃
7. C, SiO₂
8. I, SnF₄
9. I, Sr(NO₃)₂
10. I, Mg(BrO₃)₂
11. C, SeO₃
12. I, K₂CrO₄
13. C, Cl₂O₇
14. I, Mn₂(CO₃)₅
15. I, PbSO₃
16. C, S₅O₁₀