Question

directions: answer each question completely. indicate how you determined the answer to each question below.

1. write the binary ionic name for the following formulas.

a. bal₂
b. al₂s₃
c. cao

1. write the ionic name containing the polyatomic ions below.

a. mg(no₃)₂
b. srso₄
c. li₃po₄

Explanation:

Part 1 - Binary Ionic Compounds

Step 1: Recall Naming Rules for Binary Ionic Compounds

Binary ionic compounds are named by stating the cation (metal) first, followed by the anion (non - metal) with its ending changed to -ide. The subscripts in the formula are used to determine the charges (to confirm the ion identities, though for naming, we can also use the fact that the overall compound is neutral).

Step 1a: Name $BaI_2$

• The cation is $Ba^{2+}$ (barium ion) and the anion is $I^-$ (iodide ion, since iodine is a non - metal and we change the ending to -ide). Since there are 2 iodide ions to balance the +2 charge of barium, the name is Barium Iodide.

Step 1b: Name $Al_2S_3$

• The cation is $Al^{3+}$ (aluminum ion) and the anion is $S^{2 - }$ (sulfide ion, sulfur non - metal with ending -ide). To balance the charges, 2 aluminum ions (2×(+3)=+6) and 3 sulfide ions (3×(- 2)= - 6) are present. The name is Aluminum Sulfide.

Step 1c: Name $CaO$

• The cation is $Ca^{2+}$ (calcium ion) and the anion is $O^{2 - }$ (oxide ion, oxygen non - metal with ending -ide). The charges balance ( + 2 and - 2), so the name is Calcium Oxide.

Part 2 - Ionic Compounds with Polyatomic Ions

Step 2: Recall Naming Rules for Compounds with Polyatomic Ions

We name the cation first (metal or ammonium ion), then the polyatomic anion. The names of polyatomic anions are used as - is (e.g., nitrate, sulfate, phosphate etc.).

Step 2a: Name $Mg(NO_3)_2$

• The cation is $Mg^{2+}$ (magnesium ion) and the polyatomic anion is $NO_3^-$ (nitrate ion). There are 2 nitrate ions to balance the +2 charge of magnesium. The name is Magnesium Nitrate.

Step 2b: Name $SrSO_4$

• The cation is $Sr^{2+}$ (strontium ion) and the polyatomic anion is $SO_4^{2 - }$ (sulfate ion). The charges balance ( + 2 and - 2), so the name is Strontium Sulfate.

Step 2c: Name $Li_3PO_4$

• The cation is $Li^+$ (lithium ion) and the polyatomic anion is $PO_4^{3 - }$ (phosphate ion). There are 3 lithium ions (3×(+1)=+3) to balance the - 3 charge of phosphate. The name is Lithium Phosphate.

Answer:

s:

1. a. Barium Iodide

b. Aluminum Sulfide
c. Calcium Oxide

1. a. Magnesium Nitrate

b. Strontium Sulfate
c. Lithium Phosphate