| complete transfer of electrons | ionic bond |
| lattice enthalpy or lattice energy | amount of energy released when 1mole of solid ionic compound is formed from its constituent gaseous atoms |
| if attractive forces b/w const. atoms inc. then, lattice energy ... | increases |
| two factors affecting lattice energy | product of charges
inverse of distance between two charges |
| charge vs size- what dominates in deciding value of lattice energy | charge over size |
| state relation between charge on an ion and its size | inversely proportional |
| enthalpy of formation definition | energy change when one mole of compounds is formed from its constituent elements |
| role of born haber cycle | explains formation of ionic compounds in terms of energy |
| can enthalpy of formation be negative? | yes, cuz formation of some compounds is not spontaneous-- they absorb energy and, hence, del.H is positive
- spontaneous, release energy- delta h negative |
| favourable conditions for formation of ionic compound | del f H should be negative-
i.e- BDE, SE IE should be low- as they are positive values
and,
L.E , del. eg H -- high |
| ionic solids are... (color) (state) | white, crystalline solid |
| do ionic compounds show isomerism, why? | no, they are non directional |
| why IC have high mp and bp | strong forces of attraction |
| why are ic brittle? | when one layer slides over other- same type of chrges over each other- repulsion- breaks |
| IC are more soluble in solvents having ... dielectric constants | HIGH |
| meaning of dielectric constant | solvent ne dissolving compound ke electrostatic force of attraction ko E times weak kar diya |
| process of hydration | solvation in water |
