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    What is the difference between energy and enthalpy? (e.g. lattice energy vs. lattice enthalpy)
    Why are these affected by ionic radius but not other entalpies? (e.g. 1st Ionisation energy or enthalpy of atomisation)
    Also, when asked about bonding of, say, MgO, do you say it is ionic, or ionic and covalent? I was just wondering because it has ionic and covalent characteristics.
    Thanks so much!
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    (Original post by leeju)
    What is the difference between energy and enthalpy? (e.g. lattice energy vs. lattice enthalpy)
    Why are these affected by ionic radius but not other entalpies? (e.g. 1st Ionisation energy or enthalpy of atomisation)
    Also, when asked about bonding of, say, MgO, do you say it is ionic, or ionic and covalent? I was just wondering because it has ionic and covalent characteristics.
    Thanks so much!
    1. The terms energy and enthay can be used interchangably.

    2. Several enthalpy terms are affected by the ionic radius. It depends if you have to overcome (or are affected by) interparticular attractions. Ionic radius affects energy changes in ionic systems or systems that utilize electrostatic forces.

    Atomisation of metals
    Hydration enthalpy
    Lattice enthalpy

    3. MgO is ionic.
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    Thank you for giving such a clear and detailed response! From what you have said then, theoretical lattice energy is the same as theoretical lattice enthalpy?
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    (Original post by leeju)
    Thank you for giving such a clear and detailed response! From what you have said then, theoretical lattice energy is the same as theoretical lattice enthalpy?
    yes
 
 
 
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