Chapter 7, Problem 1STP

Interpretation Introduction

Interpretation: Ionic compound is to be determined.

Concept introduction:Ionic compounds refers to the chemical compound where the oppositely chargedions are linked by ionic bonds.

Answer to Problem 1STP

  ${\text{SiO}}_{\text{2}}$ is the covalent compound and the other compounds are ionic compounds.

Explanation of Solution

Ionic compounds refer to chemical compounds where oppositely charged ions are linked by ionic bonds.

The positively charged ion is the cation and the negatively charged ion is the anion, where the cation and anion are linked via strong electrostatic forces of attraction.

  ${\text{KF,Na}}_{\text{2}}{\text{SO}}_{\text{4}}$ and ${\text{Na}}_{\text{2}}\text{O}$ are ionic compound as they can dissociate into their respective cation and anion, whereas, ${\text{SiO}}_{\text{2}}$ is covalent in nature.

The covalent bond is the bond that is formed with the sharing of the electrons between the two atoms which are taking part in the bond. It is generally formed between atoms with similar electronegativity values.

The difference in the electronegativity values of the atoms of a covalent bond should be less than 1.7.

As in the case of ${\text{SiO}}_{\text{2}}$ the electronegativity of the silicon atom is 1.9 and that of the oxygen atom is 3.44, therefore, the difference between the atom is 1.54, so it is a covalent bond.