Question

write the names of the following covalent compounds: 21) so₃ 22) n₂s 23) ph₃ 24) bf₃ 25) p₂br₄ 26) co 27) sio₂ 28) sf₆ 29) nh₃ 30) no₂ write the formulas of the following covalent compounds: 31) nitrogen trichloride 32) boron carbide 33) dinitrogen trioxide 34) phosphorus pentafluoride 35) methane 36) sulfur dibromide 37) diboron tetrahydride 38) oxygen difluoride 39) carbon disulfide 40) nitrogen monoxide

Explanation:

Step1: Name - writing rules

For covalent compounds, prefixes are used to indicate the number of atoms of each element. "Mono -" is usually not used for the first element.

Step2: Name $SO_3$

There is 1 sulfur and 3 oxygen atoms, so it is sulfur trioxide.

Step3: Name $N_2S$

2 nitrogen and 1 sulfur, so it is dinitrogen sulfide.

Step4: Name $PH_3$

1 phosphorus and 3 hydrogen, it is phosphorus trihydride (also commonly called phosphine).

Step5: Name $BF_3$

1 boron and 3 fluorine, it is boron trifluoride.

Step6: Name $P_2Br_4$

2 phosphorus and 4 bromine, it is diphosphorus tetrabromide.

Step7: Name $CO$

1 carbon and 1 oxygen, it is carbon monoxide.

Step8: Name $SiO_2$

1 silicon and 2 oxygen, it is silicon dioxide.

Step9: Name $SF_6$

1 sulfur and 6 fluorine, it is sulfur hexafluoride.

Step10: Name $NH_3$

1 nitrogen and 3 hydrogen, it is nitrogen trihydride (commonly called ammonia).

Step11: Name $NO_2$

1 nitrogen and 2 oxygen, it is nitrogen dioxide.

Step12: Formula - writing rules

Use the symbols of elements and sub - scripts to represent the number of atoms.

Step13: Formula for nitrogen trichloride

Nitrogen is N and chlorine is Cl, with 1 nitrogen and 3 chlorine, so the formula is $NCl_3$.

Step14: Formula for boron carbide

Boron is B and carbon is C, the formula is $B_4C$.

Step15: Formula for dinitrogen trioxide

2 nitrogen (N) and 3 oxygen (O), so the formula is $N_2O_3$.

Step16: Formula for phosphorus pentafluoride

1 phosphorus (P) and 5 fluorine (F), the formula is $PF_5$.

Step17: Formula for methane

Carbon is C and hydrogen is H, the formula is $CH_4$.

Step18: Formula for sulfur dibromide

1 sulfur (S) and 2 bromine (Br), the formula is $SBr_2$.

Step19: Formula for diboron tetrahydride

2 boron (B) and 4 hydrogen (H), the formula is $B_2H_4$.

Step20: Formula for oxygen difluoride

1 oxygen (O) and 2 fluorine (F), the formula is $OF_2$.

Step21: Formula for carbon disulfide

1 carbon (C) and 2 sulfur (S), the formula is $CS_2$.

Step22: Formula for nitrogen monoxide

1 nitrogen (N) and 1 oxygen (O), the formula is $NO$.

Answer:

1. sulfur trioxide
2. dinitrogen sulfide
3. phosphorus trihydride (phosphine)
4. boron trifluoride
5. diphosphorus tetrabromide
6. carbon monoxide
7. silicon dioxide
8. sulfur hexafluoride
9. nitrogen trihydride (ammonia)
10. nitrogen dioxide
11. $NCl_3$
12. $B_4C$
13. $N_2O_3$
14. $PF_5$
15. $CH_4$
16. $SBr_2$
17. $B_2H_4$
18. $OF_2$
19. $CS_2$
20. $NO$