BORN -HABER CYCLE

Identify the enthalpy change represented by letter g.

• Enthalpy of formation

• Enthalpy lattice of formation

• Electron affinity of bromine

• Enthalpy of atomisation of zinc

First electron affinity of an element is usually ________ and second electron affinity is ____________.

• exothermic, endothermic.

• exothermic, exothermic.

• endothermic, endothermic.

• endothermic, exothermic.

What enthalpy change does the number 4 represent?

• Formation

• 1^st ionisation energy of Na

• 1^st electron affinity of Na

• Atomisation of Na

Which equation represents the process that occurs when the standard enthalpy of atomisation of iodine is measured?

• ½ I₂ (s) → I (g)

• I₂ (s) → 2I (g)

• ½ I₂ (g) → I (g)

• I₂ (g) → 2I (g)

Enthalpy change is represented by step y ?

• Enthalpy of formation calcium bromide

• Enthalpy of atomisation of calcium

• 1^st electron affinity of bromine

• Enthalpy of atomisation of bromine

Calculate the enthalpy change represented by X

• +695kJ/mol

• -695kJ/mol

• -635kJ/mol

• -635kJ/mol

What is the definition of lattice enthalpy?

• Heat released when one mole of solid ionic compound is formed from its gaseous ions.

• Heat released when an ionic lattice is formed from one mole of its gaseous ions.

• Heat released when one mole of an ionic lattice is formed from ions in their standard states.

• Heat released when an ionic lattice is formed from one mole of gaseous atoms.

Given the Born-Haber cycle below, which of the following enthalpy change is not represented by steps a-g

• Enthalpy of formation

• Enthalpy of atomization of calcium

• 1^st electron affinity of bromine

• 2^nd electron affinity of bromine

Mg (g) --> Mg+ (g) + e-

• Ionisation

• Combustion

• Formation

• Hydration

½ H2 (g) + ½ Cl2 (g) --> HCl (g)

• Formation

• Combustion

• Atomisation

• Ionisation