Chapter 9.2, Problem 21LC

(a)

Interpretation Introduction

Interpretation: The chemical formula of the given compound is to be stated.

Concept Introduction : Ionic compounds are formed by the transfer of electrons between metal and non-metal. They are named as $\text{Name}\text{of}\text{metal}+\text{Stem}\text{of}\text{non-metal}+\text{'}ide\text{'}$

Answer to Problem 21LC

The chemical formula of the compound is ${\text{BeCl}}_2$ .

Explanation of Solution

The given name of the compound is beryllium chloride. It is composed of ${\text{Be}}^{2+}$ and ${\text{Cl}}^{-}$ . By the criss-cross method, the chemical formula of the compound is ${\text{BeCl}}_2$ .

(b)

Interpretation Introduction

Interpretation: The chemical formula of the given compound is to be stated.

Concept Introduction : Ionic compounds are formed by the transfer of electrons between metal and non-metal. They are named as $\text{Name}\text{of}\text{metal}+\text{Stem}\text{of}\text{non-metal}+\text{'}ide\text{'}$

Answer to Problem 21LC

The chemical formula of the compound is ${\text{CsS}}_2$ .

Explanation of Solution

The given name of the compound is cesium sulfide. It is composed of ${\text{Cs}}^{+}$ and ${\text{S}}^{2-}$ . By the criss-cross method, the chemical formula of the compound is ${\text{CsS}}_2$ .

(c)

Interpretation Introduction

Interpretation: The chemical formula of the given compound is to be stated.

Concept Introduction : Ionic compounds are formed by the transfer of electrons between metal and non-metal. They are named as $\text{Name}\text{of}\text{metal}+\text{Stem}\text{of}\text{non-metal}+\text{'}ide\text{'}$

Answer to Problem 21LC

The chemical formula of the compound is $\text{NaI}$ .

Explanation of Solution

The given name of the compound is sodium iodide. It is composed of ${\text{Na}}^{+}$ and ${\text{I}}^{-}$ . By the criss-cross method, the chemical formula of the compound is $\text{NaI}$ .

(d)

Interpretation Introduction

Interpretation: The chemical formula of the given compound is to be stated.

Concept Introduction : Ionic compounds are formed by the transfer of electrons between metal and non-metal. They are named as $\text{Name}\text{of}\text{metal}+\text{Stem}\text{of}\text{non-metal}+\text{'}ide\text{'}$

Answer to Problem 21LC

The chemical formula of the compound is $\text{SrO}$ .

Explanation of Solution

The given name of the compound is strontium oxide. It is composed of ${\text{Sr}}^{2+}$ and ${\text{O}}^{2-}$ . By the criss-cross method, the chemical formula of the compound is $\text{SrO}$ .