Definitions Of Enthalpy

Question 1

What is meant by first electron affinity?

Answer 1

Enthalpy change when each atom in one mole of gaseous atoms gains one electron to form one mole gaseous -1 ions

Question 2

What is first ionisation enthalpy?

Answer 2

Enthalpy change when each atom in one mole of gaseous atoms loses one electron to form one mole of gaseous +1 ions

Question 3

What is enthalpy of atomisation?

Answer 3

Enthalpy change when one mole of gaseous atoms is produced from an element in its standard state
(1/2 I2 > I)

Question 4

What is hydration enthalpy?

Answer 4

Enthalpy change when one mole of gaseous ions become hydrated (dissolved in water)

Question 5

What is bond dissociation enthalpy?

Answer 5

Enthalpy change when one mole covalent bonds broken in gaseous state

Question 6

What is lattice enthalpy of formation?

Answer 6

Enthalpy change when one mole of a solid ionic compound is formed from its constituent ions in the gas phase

Question 7

What is lattice enthalpy of dissociation?

Answer 7

Enthalpy change when one mole of solid ionic compound is broken up into constituent ions in the gas phase