Take this Quiz: A-Level Chemistry: Thermodynamics | Zestly

Question 1

In a Born-Haber cycle for NaCl, which specific enthalpy change represents the energy required to convert one mole of gaseous chlorine atoms into one mole of gaseous chloride ions?

Accepted Answer

First electron affinity of chlorine

Question 2

Which two factors are the primary determinants of the magnitude of the lattice enthalpy of an ionic compound?

Accepted Answer

Ionic charge

Question 3

Given the following data for MgCl2: Enthalpy of formation = -641 kJ/mol, Enthalpy of atomisation of Mg = +148 kJ/mol, First ionisation energy of Mg = +738 kJ/mol, Second ionisation energy of Mg = +1450 kJ/mol, Enthalpy of atomisation of Cl = +122 kJ/mol, Electron affinity of Cl = -349 kJ/mol. Calculate the lattice enthalpy of MgCl2.

Accepted Answer

-2520 kJ/mol

Question 4

Which of the following processes are generally associated with an increase in entropy?

Answer

Melting of a solid

Answer

Condensation of a gas

Answer

Dissolving a solid in water

Answer

Formation of a crystal lattice from ions

Question 5

For a reaction where $\Delta H = +50$ kJ/mol and $\Delta S = +150$ J/(K·mol), at what minimum temperature does the reaction become feasible?

Answer

0.33 K

Answer

3.33 K

Answer

333.33 K

Answer

3333.33 K