AQA Jan 2011 Paper 5 Q1

Answers available below

section a answer all questions in the spaces provided do not write outside the box comparisons of lattice enthalpies from born haber cycles with lattice enthalpies from calculations based on a perfect ionic model are used to provide information about bonding in crystals a define the terms enthalpy of atomisation and lattice dissociation enthalpy enthalpy of atomisation lattice dissociation enthalpy marks b use the following data to calculate a value for the lattice dissociation enthalpy of sodium chloride na s na g na g na g e cl g cl g cl g e cl g na s cl g nacl s h kj mol marks wmp jan chem c consider the following lattice dissociation enthalpy hl data do not write outside the box hl experimental kj mol hl theoretical kj mol nabr agbr the values of hl experimental have been determined from born haber cycles the values of hl theoretical have been determined by calculation using a perfect ionic model c i explain the meaning of the term perfect ionic model marks c ii state what you can deduce about the bonding in nabr from the data in the table mark c iii state what you can deduce about the bonding in agbr from the data in the table mark turn over wmp jan chem

Show answer