Born-Haber Cycle

Front

What is the Born-Haber Cycle?

Back

A thermodynamic cycle that relates the lattice energy of an ionic compound to the enthalpy changes involved in its formation from its constituent elements.

Front

Define enthalpy of formation.

Back

The enthalpy change when one mole of a compound is formed from its elements in their standard states under standard conditions.

Front

What is the enthalpy of atomization?

Back

The enthalpy change required to convert one mole of a solid substance into gaseous atoms.

Front

What does the first electron affinity represent?

Back

The enthalpy change when one mole of electrons is added to one mole of gaseous atoms to form anions.

Front

What is lattice enthalpy?

Back

The enthalpy change when one mole of an ionic solid is formed from its gaseous ions.

Front

How is the enthalpy of atomization of iodine represented?

Back

½ I₂ (s) → I (g) is the equation representing the standard enthalpy of atomization of iodine.

Front

What is the significance of the enthalpy of formation in the Born-Haber Cycle?

Back

It represents the overall enthalpy change when forming an ionic compound from its elements.

Front

What is the relationship between lattice enthalpy and ionic size?

Back

As ionic size increases, lattice enthalpy decreases due to reduced electrostatic attraction between ions.

Front

What is the enthalpy change for the second electron affinity of bromine?

Back

It is the enthalpy change when an electron is added to a bromide ion to form a bromine ion, which is typically endothermic.

Front

Which compound has the lowest lattice enthalpy among NaBr, LiCl, and KI?

Back

KI has the lowest lattice enthalpy due to the larger size of the potassium ion compared to sodium and lithium.