Let’s solve this step by step.
We are given a table with cations (positive ions) on the left and anions (negative ions) on top. Our job is to write the correct chemical formula for each compound formed when these ions combine.
Rules to remember:
1.
Ionic compounds must be neutral — total positive charge = total negative charge.
2. We balance charges by using subscripts (numbers after the ion symbol).
3. If the subscript is 1, we don’t write it.
4. For polyatomic ions (like OH⁻, NO₃⁻, SO₄²⁻, PO₄³⁻), if we need more than one, we put them in parentheses and add the subscript outside.
5. The problem also says: “Identify any covalent compounds.” But note — all combinations here are between ions, so they’re ionic… EXCEPT when H⁺ combines with non-metal anions like Cl⁻ or O²⁻ — those can form covalent molecules (like HCl gas or H₂O). However, in aqueous solution, they’re often treated as acids (still ionic behavior). But strictly speaking, H⁺ + Cl⁻ → HCl is a covalent molecule (hydrogen chloride gas). Similarly, H⁺ + OH⁻ → H₂
Parent Tip: Review the logic above to help your child master the concept of writing ionic compounds worksheet.
