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Topic: Energetics, Physical Chemistry, A Level Chemistry, Singaporeīack to other previous Physical Chemistry Video Lessons.
#DO BORN HABER CYCLE PROBLEMS HOW TO#
This expression is valid for all ionic compounds.įor the detailed step-by-step discussion on how to draw the Born Haber Cycle, check out this video! We can use the follow expression to work out the relationship of all the terms in the Born Haber cycle. Since strong ionic bonds are formed, lattice energy is highly exothermic. The last step involves lattice energy which is the forming of ionic compound from its constituent gaseous ions. First electron affinity is exothermic as energy is released from attraction formed between nucleus and added electron. Ionisation energy is endothermic as energy is required to overcome attraction between nucleus and valence electron.Īdding electron to Cl to form Cl - will be the first electron affinity of Cl. Removing 2 electrons from Ca to form Ca 2+ will be the first and second ionisation energies of Ca which can be found in the Data Booklet. Ionisation involves removing the electrons from Ca (ionisation energy) and adding electrons to Cl (electron affinity). Both terms are endothermic as energy is required to break all bonds in the elements to form gaseous atoms.įor Ca we will be given the enthalpy change of atomisation of metal.įor Cl 2 usually we use bond energy of Cl-Cl bond which can be found in the Data Booklet. We can draw this close to the bottom of the energy level diagram as the rest of the terms would be endothermic hence pointing upwards.Ītomisation involves forming gaseous atoms for both calcium metal and chlorine gas. Usually enthalpy change of formation for ionic compounds is exothermic as ionic compounds are stable. Formationįormation involves the reaction from elements in the standard state to ionic compound. We usually use the energy level diagram to present the Born Haber Cycle, which can be broken down into 4 steps. Pressing the "Show Answer" button will cause the correct answer to display and you will no longert be able to submit an anser for that question.In this video we want to learn how to draw the Born Haber Cycle of ionic compounds using CaCl 2 as an example.Nonetheless, the only way to get the "correct answer" is to do a proper Born-Haber analysis of the data provided.
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In most cases, the change is less than 1%.