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122ch13a_003 - 1 Chapter 13 Homework Solutions Use the...

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1 Chapter 13 - Homework Solutions Use the following diagrams for questions concerning solution process. separated solute & separated solvent particles )))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) sep. solvent part form solute-solvent AF ) H 2 > 0 (or ) H sep solvent ) ) H 3 < 0 (or ) H solvation ) sep. solute & solvent ))))))))))))))))))) sep. solute part H ) H 1 > 0 (or ) H sep solute ) ))))))))))))))))))) solution ) H soln > 0 ))))))))))))))))))) solute + solvent ) H soln > 0 ( endothermic ); product (solution) has a higher energy than reactants (solute & solvent). Attractive forces between solute and solvent (unlike particles) are not as strong as solute-solute and solvent-solvent AF (like particles). More energy required to separate solute-solute and solvent-solvent particles than is released when form solute-solvent AF. ENDO thermic A solution process with ) H soln > 0 (+) tends to not be spontaneous (but can be). It also depends on the entropy of solution, ) S soln . See page 3.
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2 separated solute & separated solvent particles )))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) sep. solvent part form solute-solvent AF ) H 2 > 0 (or ) H sep solvent ) ) H 3 < 0 (or ) H solvation ) sep. solute & solvent ))))))))))))))))))) sep. solute part H ) H 1 > 0 (or ) H sep solute ) ))))))))))))))))))) solute + solvent ) H soln < 0 ))))))))))))))))))) solution ) H soln < 0 ( exothermic ); product (solution) has a lower energy than reactants (solute & solvent). Attractive forces between solute and solvent (unlike particles) are stronger than solute-solute and solvent-solvent AF (like particles). Less energy required to separate solute-solute and solvent-solvent particles than is released when form solute-solvent AF. EXO thermic A solution process with ) H soln < 0 (-) tends to be spontaneous (but may not be). It also depends on the entropy of solution, ) S soln . See page 3.
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3 separated solute & separated solvent particles )))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) sep. solvent part form solute-solvent AF ) H 2 > 0 (or ) H sep solvent ) ) H 3 < 0 (or ) H solvation ) sep. solute & solvent ))))))))))))))))))) sep. solute part H ) H 1 > 0 (or ) H sep solute ) ))))))))))))))))))) ))))))))))))))))))) solute + solvent ) H soln = 0 solution ) H soln = 0 ( ideal ); product (solution) has same energy as reactants (solute & solvent).
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