1. Explain in words what happens when a salt (i.e., NaCl) dissolves in water in terms of interactions that are lost and interactions that are gained. Explain for methanol (CH3OH) in water. Explain for a wax (hydrocarbon – all C’s and H’s) in water.
2. If DH1 is the enthalpy change for separating particles of solute, DH2 is the enthalpy change for separating particles of solvent, and DH3 is the enthalpy change for the formation of interaction between solute and solvent, write out an equation to determine DHrxn.
3. Explain in words and using DH values WHY it is true to say “like dissolves like.”
4. What is entropy and how does it play a part in solution chemistry? Is it possible to have an endothermic solution-making process that is nevertheless spontaneous? How is this possible?
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