Naming and Writing Formulas for Covalent (Molecular) Compounds worksheet.
Worksheet for naming and writing formulas of covalent (molecular) compounds, with two sections: Part A asks to name covalent compounds given their formulas, and Part B asks to write chemical formulas for given compound names.
PNG
1000×1294
120 KB
Free · Personal Use
Quality Assured by Worksheets Library Team
Reviewed for educational accuracy and age-appropriateness
ID: #769636
⭐
Show Answer Key & Explanations
Step-by-step solution for: Naming And Writing Covalent Compounds And KEY Worksheet
▼
Show Answer Key & Explanations
Step-by-step solution for: Naming And Writing Covalent Compounds And KEY Worksheet
You're working on a worksheet about naming and writing formulas for covalent (molecular) compounds. Covalent compounds are formed between two nonmetals, and we use prefixes to indicate the number of atoms of each element.
---
## 🔤 PART A: Name the covalent compounds
We use prefixes:
- 1 = mono- (usually omitted for the first element)
- 2 = di-
- 3 = tri-
- 4 = tetra-
- 5 = penta-
- 6 = hexa-
- 7 = hepta-
- 8 = octa-
- 9 = nona-
- 10 = deca-
> 💡 Note: The second element ends in “-ide”.
---
1. CO → Carbon monoxide
*(mono- is used for oxygen because it’s the second element)*
2. CO₂ → Carbon dioxide
3. N₂O₃ → Dinitrogen trioxide
4. NP → ❗️Invalid compound — Nitrogen and phosphorus don’t typically form a stable binary compound with 1:1 ratio. This may be a typo. If it’s meant to be N₃P or something else, it’s not standard. But if forced to name NP as written, it would be Nitrogen monophosphide — though this compound doesn’t really exist. *Likely an error.*
5. SCl₂ → Sulfur dichloride
6. P₂O₅ → Diphosphorus pentoxide
7. NBr₃ → Nitrogen tribromide
8. Cl₄ → ❗️Invalid compound — Chlorine is diatomic (Cl₂). Cl₄ is not a stable molecular compound. Possibly a typo? If it’s meant to be CCl₄, that’s carbon tetrachloride. As written, tetrachlorine isn’t standard. *Probably an error.*
9. CCl₄ → Carbon tetrachloride
10. PF₅ → Phosphorus pentafluoride
11. SeF₂ → Selenium difluoride
12. TeBr₂ → Tellurium dibromide
13. P₂S₅ → Diphosphorus pentasulfide
14. C₃N₄ → Tricarbon tetranitride
15. CH₄ → Methane *(common name)* — or technically Carbon tetrahydride, but methane is universally accepted.
16. PH₃ → Phosphine *(common name)* — or technically Phosphorus trihydride
> 📝 For CH₄ and PH₃, common names are preferred over systematic names in most contexts.
---
## 🧪 PART B: Write the chemical formula
Use the prefixes to determine subscripts.
---
1. carbon tetrafluoride → CF₄
2. silicon dioxide → SiO₂
3. dinitrogen trisulfide → N₂S₃
4. phosphorus mononitride → PN
*(Note: This is a real compound, though unstable — often written as PN)*
5. carbon disulfide → CS₂
6. dinitrogen trichloride → N₂Cl₃
7. silicon tetrabromide → SiBr₄
8. carbon dioxide → CO₂
9. nitrogen trifluoride → NF₃
10. boron trisulfide → B₂S₃
*(Note: Boron forms B₂S₃, not BS₃ — due to valency. Even though name says “boron trisulfide”, the correct formula is B₂S₃.)*
11. disulfur trioxide → S₂O₃
12. selenium tetrafluoride → SeF₄
13. diphosphorus pentasulfide → P₂S₅
14. sulfur dibromide → SBr₂
15. carbon tetrachloride → CCl₄
16. dinitrogen tetroxide → N₂O₄
---
## 📌 Summary Sheet (Final Answers):
---
1. Carbon monoxide
2. Carbon dioxide
3. Dinitrogen trioxide
4. Nitrogen monophosphide *(but likely invalid/typo)*
5. Sulfur dichloride
6. Diphosphorus pentoxide
7. Nitrogen tribromide
8. Tetrachlorine *(invalid — likely typo)*
9. Carbon tetrachloride
10. Phosphorus pentafluoride
11. Selenium difluoride
12. Tellurium dibromide
13. Diphosphorus pentasulfide
14. Tricarbon tetranitride
15. Methane *(or Carbon tetrahydride)*
16. Phosphine *(or Phosphorus trihydride)*
---
1. CF₄
2. SiO₂
3. N₂S₃
4. PN
5. CS₂
6. N₂Cl₃
7. SiBr₄
8. CO₂
9. NF₃
10. B₂S₃
11. S₂O₃
12. SeF₄
13. P₂S₅
14. SBr₂
15. CCl₄
16. N₂O₄
---
## 💡 Tips:
- Always check if the compound is real — some like NP or Cl₄ are not stable or don’t exist.
- Use common names where appropriate (like methane, phosphine).
- Remember: “mono-” is only used for the second element (e.g., CO = carbon monoxide), never for the first unless needed for clarity (rare).
Let me know if you want flashcards or practice quizzes based on this! 😊
---
## 🔤 PART A: Name the covalent compounds
We use prefixes:
- 1 = mono- (usually omitted for the first element)
- 2 = di-
- 3 = tri-
- 4 = tetra-
- 5 = penta-
- 6 = hexa-
- 7 = hepta-
- 8 = octa-
- 9 = nona-
- 10 = deca-
> 💡 Note: The second element ends in “-ide”.
---
✔ Answers for Part A:
1. CO → Carbon monoxide
*(mono- is used for oxygen because it’s the second element)*
2. CO₂ → Carbon dioxide
3. N₂O₃ → Dinitrogen trioxide
4. NP → ❗️Invalid compound — Nitrogen and phosphorus don’t typically form a stable binary compound with 1:1 ratio. This may be a typo. If it’s meant to be N₃P or something else, it’s not standard. But if forced to name NP as written, it would be Nitrogen monophosphide — though this compound doesn’t really exist. *Likely an error.*
5. SCl₂ → Sulfur dichloride
6. P₂O₅ → Diphosphorus pentoxide
7. NBr₃ → Nitrogen tribromide
8. Cl₄ → ❗️Invalid compound — Chlorine is diatomic (Cl₂). Cl₄ is not a stable molecular compound. Possibly a typo? If it’s meant to be CCl₄, that’s carbon tetrachloride. As written, tetrachlorine isn’t standard. *Probably an error.*
9. CCl₄ → Carbon tetrachloride
10. PF₅ → Phosphorus pentafluoride
11. SeF₂ → Selenium difluoride
12. TeBr₂ → Tellurium dibromide
13. P₂S₅ → Diphosphorus pentasulfide
14. C₃N₄ → Tricarbon tetranitride
15. CH₄ → Methane *(common name)* — or technically Carbon tetrahydride, but methane is universally accepted.
16. PH₃ → Phosphine *(common name)* — or technically Phosphorus trihydride
> 📝 For CH₄ and PH₃, common names are preferred over systematic names in most contexts.
---
## 🧪 PART B: Write the chemical formula
Use the prefixes to determine subscripts.
---
✔ Answers for Part B:
1. carbon tetrafluoride → CF₄
2. silicon dioxide → SiO₂
3. dinitrogen trisulfide → N₂S₃
4. phosphorus mononitride → PN
*(Note: This is a real compound, though unstable — often written as PN)*
5. carbon disulfide → CS₂
6. dinitrogen trichloride → N₂Cl₃
7. silicon tetrabromide → SiBr₄
8. carbon dioxide → CO₂
9. nitrogen trifluoride → NF₃
10. boron trisulfide → B₂S₃
*(Note: Boron forms B₂S₃, not BS₃ — due to valency. Even though name says “boron trisulfide”, the correct formula is B₂S₃.)*
11. disulfur trioxide → S₂O₃
12. selenium tetrafluoride → SeF₄
13. diphosphorus pentasulfide → P₂S₅
14. sulfur dibromide → SBr₂
15. carbon tetrachloride → CCl₄
16. dinitrogen tetroxide → N₂O₄
---
## 📌 Summary Sheet (Final Answers):
---
✔ Part A: Names
1. Carbon monoxide
2. Carbon dioxide
3. Dinitrogen trioxide
4. Nitrogen monophosphide *(but likely invalid/typo)*
5. Sulfur dichloride
6. Diphosphorus pentoxide
7. Nitrogen tribromide
8. Tetrachlorine *(invalid — likely typo)*
9. Carbon tetrachloride
10. Phosphorus pentafluoride
11. Selenium difluoride
12. Tellurium dibromide
13. Diphosphorus pentasulfide
14. Tricarbon tetranitride
15. Methane *(or Carbon tetrahydride)*
16. Phosphine *(or Phosphorus trihydride)*
---
✔ Part B: Formulas
1. CF₄
2. SiO₂
3. N₂S₃
4. PN
5. CS₂
6. N₂Cl₃
7. SiBr₄
8. CO₂
9. NF₃
10. B₂S₃
11. S₂O₃
12. SeF₄
13. P₂S₅
14. SBr₂
15. CCl₄
16. N₂O₄
---
## 💡 Tips:
- Always check if the compound is real — some like NP or Cl₄ are not stable or don’t exist.
- Use common names where appropriate (like methane, phosphine).
- Remember: “mono-” is only used for the second element (e.g., CO = carbon monoxide), never for the first unless needed for clarity (rare).
Let me know if you want flashcards or practice quizzes based on this! 😊
Parent Tip: Review the logic above to help your child master the concept of naming molecular compounds worksheet answers.
