Concept explainers
Interpretation:
The physical properties of ionic solids linked with ionic bonds needs to be explained.
Concept introduction:
Ionic bonds are formed when there is complete transfer of electrons from one atom to another. Here the atoms either lose or gain electrons so as to form negatively or positively charged ions. Due to its interaction, there is forces of attraction between these ions resulting in ionic bond.
Answer to Problem 63A
The 3 main properties of ionic compounds that are linked with ionic bonds are high melting point, brittle nature, high enthalpy of fusion and vaporization.
Explanation of Solution
Atoms convert to ions by losing electron or gaining electrons. The ions that are formed have positive or negative charges on them and hence when placed at interatomic distance will be attracted to one another. Due to the interionic bonds which are electrostatic in nature, it will be attracted. This results in formation of ionic bonds. The properties of these compounds are defined by this electrostatic force.
- High melting and boiling points: As the force of attraction between the ions is large and the ions occupy the lattice points of crystal, great amount of energy is required to break the bonds. Hence, to convert solid to liquid or vapor requires more energy.
- Brittle nature: The force of attraction between ions is strong and as the ions occupy the crystal lattice, the ionic compounds are mostly hard and brittle. It is mostly crystalline in nature and is brittle. It will break to powder form.
- High enthalpy of fusion and enthalpy of vaporization: The force of attraction between ions causes strong bonds which is not easy to break. Enthalpy of vaporization is the energy required to convert the solid to vapor form wherein these compounds requires more energy to break the bond. Similarly energy required to convert solid to liquid is enthalpy of fusion, wherein the energy required to break the bond is high.
The 3 main properties of ionic compounds that are linked with ionic bonds are high melting point, brittle nature, high enthalpy of fusion and vaporization.
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