Binary covalent compounds practice worksheet for naming chemical formulas.

Here is the solution to the Binary Covalent Compounds Practice Worksheet, with explanations for each compound.

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✔ Rules for Naming Binary Covalent Compounds:

1. First element: Use the full element name.
2. Second element: Change the ending to “-ide”.
3. Use prefixes (mono-, di-, tri-, tetra-, penta-, hexa-, hepta-, octa-, nona-, deca-) to indicate the number of atoms.
- *Exception*: Do not use “mono-” on the first element.
- Example: CO = carbon monoxide (not monocarbon monoxide).

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🔢 Solutions with Explanations:

1. CO → Carbon monoxide
- 1 carbon, 1 oxygen → “mono-” for oxygen only (no “mono-” on carbon).

2. SO₂ → Sulfur dioxide
- 1 sulfur, 2 oxygens → “di-” for oxygen.

3. CO₂ → Carbon dioxide
- 1 carbon, 2 oxygens → “di-” for oxygen.

4. N₂O₃ → Dinitrogen trioxide
- 2 nitrogens, 3 oxygens → “di-” and “tri-”.

5. P₄O₆ → Tetraphosphorus hexoxide
- 4 phosphorus, 6 oxygen → “tetra-” and “hexa-”.
*(Note: “hexa-” becomes “hex-” before oxide — common convention)*

6. IF₇ → Iodine heptafluoride
- 1 iodine, 7 fluorines → “hepta-” for fluorine.

7. BrCl → Bromine chloride
- 1 bromine, 1 chlorine → “mono-” is omitted for both since it’s implied.

8. CF₄ → Carbon tetrafluoride
- 1 carbon, 4 fluorines → “tetra-” for fluorine.

9. SeBr₂ → Selenium dibromide
- 1 selenium, 2 bromines → “di-” for bromine.

10. N₂H₅ → Dinitrogen pentahydride
- 2 nitrogens, 5 hydrogens → “di-” and “penta-”.
*(Note: This compound is actually unstable and not commonly encountered; but per naming rules, this is correct.)*

11. P₄O₁₀ → Tetraphosphorus decoxide
- 4 phosphorus, 10 oxygen → “tetra-” and “deca-” → often written as “decoxide”.

12. Cl₂O₈ → Dichlorine octoxide
- 2 chlorines, 8 oxygens → “di-” and “octa-” → “octoxide”.

13. PN → Phosphorus mononitride
- 1 phosphorus, 1 nitrogen → “mono-” for nitrogen (first element has no prefix).

14. PH₃ → Phosphorus trihydride
- 1 phosphorus, 3 hydrogens → “tri-” for hydrogen.
*(Note: Commonly called “phosphine”, but systematic name is phosphorus trihydride.)*

15. S₂O₇ → Disulfur heptoxide
- 2 sulfurs, 7 oxygens → “di-” and “hepta-” → “heptoxide”.

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📝 Final Answer Key:

1. Carbon monoxide
2. Sulfur dioxide
3. Carbon dioxide
4. Dinitrogen trioxide
5. Tetraphosphorus hexoxide
6. Iodine heptafluoride
7. Bromine chloride
8. Carbon tetrafluoride
9. Selenium dibromide
10. Dinitrogen pentahydride
11. Tetraphosphorus decoxide
12. Dichlorine octoxide
13. Phosphorus mononitride
14. Phosphorus trihydride
15. Disulfur heptoxide

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✔ Tip: Always check if the compound is truly binary (only two elements) and covalent (nonmetal + nonmetal). All compounds here fit that description.

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