Question

1. write the name or chemical formula for the molecular compounds below.

number 1 2 3 4 5 6 7 8 9 10
prefix mono di tri tetra penta hexa hepta octa nona deca
so₃
p₂o₅
n₂o₃
pbr₃
s₄n₄
cs₂
pcl₃
carbon dioxide
dinitrogen monoxide
carbon tetrachloride
triphosphorus pentanitride
boron trifluoride
diarsenic pentoxide
silicon tetraiodide

Explanation:

Step1: Name $SO_3$

The prefix for 3 is "tri -", and the elements are sulfur and oxygen. So it is sulfur trioxide.

Step2: Name $P_2O_5$

The prefix for 2 is "di -" for phosphorus and "penta -" for 5 oxygen atoms. So it is diphosphorus pentoxide.

Step3: Name $N_2O_3$

The prefix for 2 is "di -" for nitrogen and "tri -" for 3 oxygen atoms. So it is dinitrogen trioxide.

Step4: Name $PBr_3$

The prefix for 3 is "tri -", and the elements are phosphorus and bromine. So it is phosphorus tribromide.

Step5: Name $S_4N_4$

The prefix for 4 is "tetra -", so it is tetrasulfur tetranitride.

Step6: Name $CS_2$

The prefix for 2 is "di -", and the elements are carbon and sulfur. So it is carbon disulfide.

Step7: Name $PCl_3$

The prefix for 3 is "tri -", and the elements are phosphorus and chlorine. So it is phosphorus trichloride.

Step8: Write formula for carbon dioxide

The prefix "di -" means 2 oxygen atoms with 1 carbon atom, so the formula is $CO_2$.

Step9: Write formula for dinitrogen monoxide

The prefix "di -" means 2 nitrogen atoms and "mono -" means 1 oxygen atom, so the formula is $N_2O$.

Step10: Write formula for carbon tetrachloride

The prefix "tetra -" means 4 chlorine atoms with 1 carbon atom, so the formula is $CCl_4$.

Step11: Write formula for triphosphorus pentanitride

The prefix "tri -" means 3 phosphorus atoms and "penta -" means 5 nitrogen atoms, so the formula is $P_3N_5$.

Step12: Write formula for boron trifluoride

The prefix "tri -" means 3 fluorine atoms with 1 boron atom, so the formula is $BF_3$.

Step13: Write formula for diarsenic pentoxide

The prefix "di -" means 2 arsenic atoms and "penta -" means 5 oxygen atoms, so the formula is $As_2O_5$.

Step14: Write formula for silicon tetraiodide

The prefix "tetra -" means 4 iodine atoms with 1 silicon atom, so the formula is $SiI_4$.

Answer:

$SO_3$: sulfur trioxide
$P_2O_5$: diphosphorus pentoxide
$N_2O_3$: dinitrogen trioxide
$PBr_3$: phosphorus tribromide
$S_4N_4$: tetrasulfur tetranitride
$CS_2$: carbon disulfide
$PCl_3$: phosphorus trichloride
carbon dioxide: $CO_2$
dinitrogen monoxide: $N_2O$
carbon tetrachloride: $CCl_4$
triphosphorus pentanitride: $P_3N_5$
boron trifluoride: $BF_3$
diarsenic pentoxide: $As_2O_5$
silicon tetraiodide: $SiI_4$