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Why are some solution processes exotherm...

Why are some solution processes exothermic whereas others are endothermic?

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The overall energy change associated with dissolution depends on the rolative magnitude of the solutesolute, solvent-solvent and solute-solvent interactions. The process is exothermic if the new interaction release more energy than disrupting the old interactions requires, it is endothermic if opoosite is true.
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Knowledge Check

  • Which process is exothermic ?

    A
    condensation
    B
    fusion
    C
    sublimation
    D
    vaporization

  • The dissolving process is exothermic when :

    A
    The energy released in solvation exceeds the energy used in breaking up solute-solute and solvent solvent interactions.
    B
    The energy used in solvation exceeds the enrgy released in breaking up solute-solute and solvent solvent interactions.
    C
    The energy released in solvation is about the same as the enrgy used in breaking up solute-solute and solvent-solvent interactions.
    D
    The energy used in solvation is about the same as the energy used in breaking up solute-solute and solvent-solvent interactions.

  • Exothermic process is

    A
    `Na to Na^(+) +e^(-)`
    B
    `O+e^(-) to O^(-)`
    C
    `O^(-)+e^(-) to O^(2-)`
    D
    `Cl^(-) to Cl+e^(-)`

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