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    Topic Notes 

    topic_5_2014_notes.doc
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    topic_15_2014_notes.doc
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    Investigations

    Prescribed Practicals
    topic_5.1_determining_enthalpy_change_of_solution.doc
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    topic_5.1_15.1_and_19.1_determining_enthalpy_change_of_a_single_replacement_reaction.doc
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    ​Other investigations 
    rsc_problem_9_-_cool_drinking.pdf
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    topic_6_using_hess_law_sodium_hydrogen_carbonate.doc
    File Size: 40 kb
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    topic_6_using_hess_law_combustion_of_magnesium.doc
    File Size: 43 kb
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    topic_6_usinghesslaw_hydration_copper_sulphate.doc
    File Size: 37 kb
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    ​Analysis
    systematic_errors_in_hess_law.doc
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    Presentations

    ​Hess's Law
    hess_law.pptx
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    Standard enthalpies 
    example_using_enthalpy_of_formation_and_combustion.pptx
    File Size: 86 kb
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    using_enthalpies_of_formation.pptx
    File Size: 88 kb
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    worksheets & help sheets 

    ​Calculating enthalpy 
    exercises_on_enthalpy_change.doc
    File Size: 29 kb
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    pogil_calorimetry.original.pdf
    File Size: 145 kb
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    measuring_heat_of_combustion.doc
    File Size: 41 kb
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    pogil_measurement_of_heat_energy.doc
    File Size: 168 kb
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    Harber cycle 
    lattice_enthalpies.doc
    File Size: 58 kb
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    worked_examples_of_born-haber_cycles.pdf
    File Size: 122 kb
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    ​Hess's Law 
    answer_to_hess_law_questions.pdf
    File Size: 318 kb
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    hess_law.doc
    File Size: 25 kb
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    hess_law_ohp.doc
    File Size: 30 kb
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    hesss_law_adding_equations_examples.doc
    File Size: 31 kb
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    Enthalpy
    using_enthalpy_of_formation.doc
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    Resources 

    ​Bond enthalpy
    calculating_enthalpy_of_reaction_using_enthalpy_of_formation.doc
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    using_bond_enthalpies_to_calculate_enthalpy_changes_of_reactions.doc
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    exothermic_and_endothermic_reaction.docx
    File Size: 119 kb
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    Animations 

    Revision 

    Remember:
    • Check the unit of an enthalpy change; either it is in kJ or kJ mol-1.
    • When calculating molar enthalpy change do not use the mass of the water/surroundings to calculate the number of moles. Also make sure you clearly state the sign i.e + or -.
    • When calculating free energy you should have enthalpy and entropy in the same units either both in kJ or both in J; temperature should be in K.
    • Make sure the state symbols are (g) in your equations defining ionization energy, electron affinity and bond enthalpy.
    • Bond enthalpy is for 1 mole of covalent bonds in gaseous molecules to form gaseous atoms.
    • Bond enthalpy is also an AVERAGE
    • Calculating enthalpy change using bond enthalpies is reactants - products as is using enthalpies of combustion; other are products - reactants.