Question

section iii: names, classification, and formulas for compounds
in the table below, fill in the missing components for each compound. if the name is present, write the formula.
if the formula is present, write the name. pay attention to the classification.

chemical formula	classification	name
	ionic compound	potassium oxalate
$\text{nbr}_3$	molecule
$\text{fepo}_4$	ionic compound
	molecule	iodine pentafluoride
$\text{hi}$	acid

Explanation:

Step1: Name the acid $\ce{H2ClO2}$

The anion $\ce{ClO2^2-}$ is chlorite, so the acid is chlorous acid (dihydrogen chlorite is also acceptable, but chlorous acid is standard for this oxyacid).

Step2: Find formula for potassium oxalate

Potassium is $\ce{K+}$, oxalate is $\ce{C2O4^2-}$. Balance charges: $2\ce{K+}$ for $\ce{C2O4^2-}$, so formula is $\ce{K2C2O4}$.

Step3: Name the molecule $\ce{NBr3}$

Use prefixes: nitrogen tribromide.

Step4: Name the ionic compound $\ce{FePO4}$

Phosphate is $\ce{PO4^3-}$, so $\ce{Fe^3+}$ (iron(III)). Name: iron(III) phosphate.

Step5: Find formula for iodine pentafluoride

Iodine is $\ce{I}$, pentafluoride is $\ce{F5}$. Formula: $\ce{IF5}$.

Step6: Name the acid $\ce{HI}$

This is a binary acid: hydroiodic acid.

Answer:

Chemical formula	classification	name
$\ce{K2C2O4}$	ionic compound	potassium oxalate
$\ce{NBr3}$	molecule	nitrogen tribromide
$\ce{FePO4}$	ionic compound	iron(III) phosphate
$\ce{IF5}$	molecule	iodine pentafluoride
$\ce{HI}$	acid	hydroiodic acid