Question

determine the chemical formula of the ionic compounds listed below: 1. magnesium nitride 2. calcium oxide 3. potassium iodide 4. lithium chloride 5. potassium sulfide

Explanation:

Step1: Determine ion charges

Magnesium forms $Mg^{2 + }$ ion and nitride is $N^{3 - }$. To balance charges, we need 3 magnesium ions and 2 nitride ions.

Step2: Write formula

The chemical formula is $Mg_{3}N_{2}$.

Step3: Determine ion charges for calcium oxide

Calcium forms $Ca^{2+}$ ion and oxygen forms $O^{2 - }$ ion.

Step4: Write formula

The chemical formula is $CaO$.

Step5: Determine ion charges for potassium iodide

Potassium forms $K^{+}$ ion and iodide is $I^{-}$ ion.

Step6: Write formula

The chemical formula is $KI$.

Step7: Determine ion charges for lithium chloride

Lithium forms $Li^{+}$ ion and chloride is $Cl^{-}$ ion.

Step8: Write formula

The chemical formula is $LiCl$.

Step9: Determine ion charges for potassium sulfide

Potassium forms $K^{+}$ ion and sulfide is $S^{2 - }$ ion. To balance charges, we need 2 potassium ions.

Step10: Write formula

The chemical formula is $K_{2}S$.

Answer:

1. $Mg_{3}N_{2}$
2. $CaO$
3. $KI$
4. $LiCl$
5. $K_{2}S$