Question

4 part question

A solution is supersaturated when
A. it is in contact with solute not dissolved
B. addition of a crystal of the solute starts crystallization of excess solute
C. it is formed from two completely miscible liquids
D. it is a homogeneous mixture of the solute and solvent
E. all of the statements given are true

When solute and solvent are mixed, and solute-solvent attractions are stronger than solute-solute and solvent-solvent
attractions,
A. the entropy change is minimal

B. heat is released

C. heat is absorbed D. dissolution will not occur
E. none of the above

An ionic solid such a sodium chloride dissolves in water because
A. molecules of NaCl react with water molecules to form ions
B. a nonelectrolyte forms
C. the disorder of the system decreases as the two components, NaCl and H2O, change to one component, the
solution
D. the water molecules are attracted to the sodium and chloride ions by ion-dipole attractions and form hydrated ions
E. none of these

For many ionic compounds that dissolve with the absorption of heat, what is the driving force?
A. higher energy state achieved

B. more disordered state achieved
C. no driving force

D. both A and B
E. none of the above

Answer 1

A solution is supersaturated when

Answer: (A) it is in contact with solute not dissolved

When solute and solvent are mixed, and solute-solvent attractions are stronger than solute-solute and solvent-solvent

Answer:B. heat is released

An ionic solid such a sodium chloride dissolves in water because

Answer:D. the water molecules are attracted to the sodium and chloride ions by ion-dipole attractions and form hydrated ions

For many ionic compounds that dissolve with the absorption of heat, what is the driving force?
answer D (A&B). higher energy state achieved

B. more disordered state achieved