DE Born Haber Cycles

Front

What is the Born-Haber cycle?

Back

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

Front

Define standard enthalpy of formation (ΔHf°).

Back

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

Front

What is lattice energy?

Back

The energy released when one mole of an ionic crystalline compound is formed from its gaseous ions.

Front

What does the enthalpy of sublimation represent?

Back

The enthalpy change required to convert one mole of a solid directly into a gas without passing through the liquid phase.

Front

What is the significance of electron affinity?

Back

The energy change that occurs when an electron is added to a neutral atom in the gas phase to form a negative ion.

Front

Explain the process of atomization.

Back

The enthalpy change associated with converting a substance into its gaseous atoms.

Front

What is the enthalpy change for the reaction: ½ H2 (g) + ½ Cl2 (g) → HCl (g)?

Back

This reaction represents the standard enthalpy of formation of hydrogen chloride.

Front

What is the difference between ionization energy and electron affinity?

Back

Ionization energy is the energy required to remove an electron from a neutral atom, while electron affinity is the energy change when an electron is added to a neutral atom.

Front

What does the enthalpy change depend on in a chemical reaction?

Back

The enthalpy change depends only on the difference in enthalpy content of the products and reactants, not on the pathway taken.

Front

What is the standard enthalpy of combustion?

Back

The enthalpy change when one mole of a substance is completely burned in excess oxygen under standard conditions.