Lattice Enthalpy (OCR A-Level Chemistry A): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What does lattice enthalpy measure?
What does lattice enthalpy measure?
Strength of ionic bonding in lattice
What is the sign of lattice enthalpy when forming an ionic solid from gaseous ions?
What is the sign of lattice enthalpy when forming an ionic solid from gaseous ions?
Always negative (exothermic)
Why are Born-Haber cycles used to determine lattice enthalpy?
Why are Born-Haber cycles used to determine lattice enthalpy?
Lattice enthalpy can't be measured directly
What is the sign of the enthalpy change of atomization?
What is the sign of the enthalpy change of atomization?
Always positive (endothermic)
Why is first ionization energy always endothermic?
Why is first ionization energy always endothermic?
Must overcome attraction between e⁻ & nucleus
What is the sign of the first electron affinity for chlorine?
What is the sign of the first electron affinity for chlorine?
Negative (exothermic)
Why is the second electron affinity of oxygen endothermic?
Why is the second electron affinity of oxygen endothermic?
Electron added to negative O⁻ ion (repulsion)
In a Born-Haber cycle for , how are chlorine atomization values treated?
In a Born-Haber cycle for , how are chlorine atomization values treated?
Multiply by 2 (two Cl atoms needed)
For , kJ mol⁻¹. What is the Cl-Cl bond enthalpy?
For , kJ mol⁻¹. What is the Cl-Cl bond enthalpy?
+242 kJ mol⁻¹
In Born-Haber cycles, which law allows calculation of lattice enthalpy?
In Born-Haber cycles, which law allows calculation of lattice enthalpy?
Hess's Law