Question

ionic compounds test review
part 1: name → formula
write the formula for the following compounds.

1. lithium bromide
2. calcium sulfide
3. copper(ii) chloride
4. potassium nitrate

part 2: formula → name
write the correct name for the following compounds using the formula.

1. bao
2. al₂o₃
3. feso₄
4. nh₄cl

Explanation:

Step1: Determine ions for each compound

• Lithium bromide: \(Li^+\) and \(Br^-\).
• Calcium sulfide: \(Ca^{2+}\) and \(S^{2-}\).
• Copper(II) chloride: \(Cu^{2+}\) and \(Cl^-\).
• Potassium nitrate: \(K^+\) and \(NO_3^-\).
• \(BaO\): \(Ba^{2+}\) and \(O^{2-}\).
• \(Al_2O_3\): \(Al^{3+}\) and \(O^{2-}\).
• \(FeSO_4\): \(Fe^{2+}\) and \(SO_4^{2-}\).
• \(NH_4Cl\): \(NH_4^+\) and \(Cl^-\).

Step2: Write formulas/names based on ion charges

• For ionic compounds, the overall charge should be zero.
• Lithium bromide: \(LiBr\) (1:1 ratio of \(Li^+\) and \(Br^-\)).
• Calcium sulfide: \(CaS\) (1:1 ratio of \(Ca^{2+}\) and \(S^{2-}\)).
• Copper(II) chloride: \(CuCl_2\) (1 \(Cu^{2+}\) and 2 \(Cl^-\)).
• Potassium nitrate: \(KNO_3\) (1:1 ratio of \(K^+\) and \(NO_3^-\)).
• \(BaO\): Barium oxide.
• \(Al_2O_3\): Aluminum oxide.
• \(FeSO_4\): Iron(II) sulfate.
• \(NH_4Cl\): Ammonium chloride.

Answer:

1. \(LiBr\)
2. \(CaS\)
3. \(CuCl_2\)
4. \(KNO_3\)
5. Barium oxide
6. Aluminum oxide
7. Iron(II) sulfate
8. Ammonium chloride