Question

determine the name of the ionic compounds listed below:

1. na₂s sodium sulfide
2. al₂o₃ aluminum oxide
3. kcl potassium chloride
4. mgo magnesium oxide
5. nabr sodium bromide

determine the chemical formula of the ionic compounds listed below:

1. magnesium nitride mg₃n₂
2. calcium oxide cao
3. potassium iodide ki
4. lithium chloride licl
5. potassium sulfide k₂s

Explanation:

Part 1: Naming Ionic Compounds (Checking the Answers)

For ionic compounds, we name them by stating the cation (metal) first and then the anion (non - metal, with its ending changed to -ide).

1. \(Na_2S\): Sodium is the cation (\(Na^+\)) and sulfide is the anion (\(S^{2 -}\)). The name sodium sulfide is correct.
2. \(Al_2O_3\): Aluminum (\(Al^{3+}\)) is the cation and oxide (\(O^{2 -}\)) is the anion. Aluminum oxide is correct.
3. \(KCl\): Potassium (\(K^+\)) and chloride (\(Cl^-\)). The correct name should be potassium chloride (note: the original has a spelling error, "potaesium" should be "potassium").
4. \(MgO\): Magnesium (\(Mg^{2+}\)) and oxide (\(O^{2 -}\)). Magnesium oxide is correct.
5. \(NaBr\): Sodium (\(Na^+\)) and bromide (\(Br^-\)). Sodium bromide is correct.

Part 2: Writing Chemical Formulas (Checking the Answers)

For writing chemical formulas of ionic compounds, we use the criss - cross method: the charge of the cation becomes the subscript of the anion and vice - versa, and then we simplify if possible.

1. Magnesium nitride: Magnesium has a charge of \(Mg^{2+}\) and nitride has a charge of \(N^{3 -}\). Using criss - cross, we get \(Mg_3N_2\), which is correct.
2. Calcium oxide: Calcium (\(Ca^{2+}\)) and oxide (\(O^{2 -}\)). The formula \(CaO\) (since \(2\) and \(2\) simplify to \(1\)) is correct.
3. Potassium iodide: Potassium (\(K^+\)) and iodide (\(I^-\)). The formula \(KI\) is correct.
4. Lithium chloride: Lithium (\(Li^+\)) and chloride (\(Cl^-\)). The formula \(LiCl\) is correct.
5. Potassium sulfide: Potassium (\(K^+\)) and sulfide (\(S^{2 -}\)). Using criss - cross, we get \(K_2S\), which is correct.

Summary of Corrections and Confirmations

• Naming Corrections: The name for \(KCl\) should be potassium chloride (correcting the spelling error).
• Formula Confirmations: All the chemical formulas for the named ionic compounds are correct.

Answer:

Part 1: Naming Ionic Compounds (Checking the Answers)

For ionic compounds, we name them by stating the cation (metal) first and then the anion (non - metal, with its ending changed to -ide).

1. \(Na_2S\): Sodium is the cation (\(Na^+\)) and sulfide is the anion (\(S^{2 -}\)). The name sodium sulfide is correct.
2. \(Al_2O_3\): Aluminum (\(Al^{3+}\)) is the cation and oxide (\(O^{2 -}\)) is the anion. Aluminum oxide is correct.
3. \(KCl\): Potassium (\(K^+\)) and chloride (\(Cl^-\)). The correct name should be potassium chloride (note: the original has a spelling error, "potaesium" should be "potassium").
4. \(MgO\): Magnesium (\(Mg^{2+}\)) and oxide (\(O^{2 -}\)). Magnesium oxide is correct.
5. \(NaBr\): Sodium (\(Na^+\)) and bromide (\(Br^-\)). Sodium bromide is correct.

Part 2: Writing Chemical Formulas (Checking the Answers)

For writing chemical formulas of ionic compounds, we use the criss - cross method: the charge of the cation becomes the subscript of the anion and vice - versa, and then we simplify if possible.

1. Magnesium nitride: Magnesium has a charge of \(Mg^{2+}\) and nitride has a charge of \(N^{3 -}\). Using criss - cross, we get \(Mg_3N_2\), which is correct.
2. Calcium oxide: Calcium (\(Ca^{2+}\)) and oxide (\(O^{2 -}\)). The formula \(CaO\) (since \(2\) and \(2\) simplify to \(1\)) is correct.
3. Potassium iodide: Potassium (\(K^+\)) and iodide (\(I^-\)). The formula \(KI\) is correct.
4. Lithium chloride: Lithium (\(Li^+\)) and chloride (\(Cl^-\)). The formula \(LiCl\) is correct.
5. Potassium sulfide: Potassium (\(K^+\)) and sulfide (\(S^{2 -}\)). Using criss - cross, we get \(K_2S\), which is correct.

Summary of Corrections and Confirmations

• Naming Corrections: The name for \(KCl\) should be potassium chloride (correcting the spelling error).
• Formula Confirmations: All the chemical formulas for the named ionic compounds are correct.