CHEM 120 UNIT 6 RADIOACTIVE DECAY
URANIUM-238 DISCUSSION 2026 COMPLETE
ACADEMIC QUESTIONS AND CORRECT
ANSWERS FULL REVIEW
◉ 2) A solution that contains more solute that would normally
dissolve at a particular temperature and pressure is a(n) ________
solution. Answer: supersaturated
◉ 2) The formation of crystals by particles of a solute that had
previously dissolved from a crystal is called ________. Answer:
recrystallization
◉ 2) The rapid release of a dissolved gas from a liquid is called
________.. Answer: effervescence
◉ 23) The state in which the processes of distribution and
recrystallization of a solute occur at the same rate is called ________..
Answer: solution equilibrium
◉ 24) Which will dissolve faster:
25 g of CuSO4 in powder
or
,25 g of CuSO4 in one crystal? Why?. Answer: 25 g of CuSO4 in
powder have larger surface area
◉ 25) You can increase the rate of dissolution by ________ a solution
or by increasing the ________ of the solvent, both of which cause the
dissolved solute particles to dissolve faster.. Answer: agitating ;
temperature
◉ 26) If 50 mL of acetic acid is added to 100 mL of water at 60°C,
will it produce a saturated solution? Why, or why not?. Answer: No,
acetic acid is completely miscible in water so no amount of solute
will ever produce a saturated solution.
◉ 27) Increasing the temperature will permit more of a solid or
liquid solute to be dissolved in a liquid solvent but the opposite is
true of __________ dissolved in liquids.. Answer: gases
◉ 28) Which of these solutions are unsaturated?. Answer: 75.5 g of
LiCl at 20°C
2.00 g of PbCl2 at 80°C
100.2 g of NaNO3 at 60°C
,◉ 29) Which of these solutions are saturated?. Answer: 128 g of KI
at 0°C
8.22 g of Ba(OH)2 at 40°C
◉ 30) The degree of contrast between two opposing forces is called
_________.. Answer: polarity
◉ 31) To reduce the amount of CO2 that escapes from a bottle of
carbonated beverage when you open the cap, you should ________..
Answer: Put the bottle in a refrigerator for several hours before
opening the cap.
◉ 32) As a rule, solvents consisting of polar molecules will dissolve
substances that are ________.. Answer: polar
◉ 33) The general rule for determining solubility is:. Answer: "like
dissolves like"
◉ 34) When calcium chloride dissolves in water, it recrystallizes as
a(n) _______, with the chemical formula CaCl2 • 2H2O.. Answer:
hydrate
, ◉ 35) The net energy change when a solute is dissolved in a solution
is called _________.. Answer: enthalpy of solution
◉ 36) If the sum of the energy required to dissolve a solute is
greater than the energy released when the solute is solvated, then
the enthalpy of solution is _________ and the final temperature of the
solution is lower than its temperature before dissolution.. Answer:
endothermic
◉ 37) A negative value for the enthalpy of solution, ΔHsol, indicates
a(n) _________ process.. Answer: exothermic
◉ 38) Which of the following solutes would be the best substance to
produce a solution that could be placed in an instant hot pack?
Review table B-9.. Answer: HI
◉ vvv Lab: electrolytes vvv. Answer: vvv Lab: electrolytes vvv
◉ 1) Complete the table with data from the lab.
Distilled Water
Tap Water
URANIUM-238 DISCUSSION 2026 COMPLETE
ACADEMIC QUESTIONS AND CORRECT
ANSWERS FULL REVIEW
◉ 2) A solution that contains more solute that would normally
dissolve at a particular temperature and pressure is a(n) ________
solution. Answer: supersaturated
◉ 2) The formation of crystals by particles of a solute that had
previously dissolved from a crystal is called ________. Answer:
recrystallization
◉ 2) The rapid release of a dissolved gas from a liquid is called
________.. Answer: effervescence
◉ 23) The state in which the processes of distribution and
recrystallization of a solute occur at the same rate is called ________..
Answer: solution equilibrium
◉ 24) Which will dissolve faster:
25 g of CuSO4 in powder
or
,25 g of CuSO4 in one crystal? Why?. Answer: 25 g of CuSO4 in
powder have larger surface area
◉ 25) You can increase the rate of dissolution by ________ a solution
or by increasing the ________ of the solvent, both of which cause the
dissolved solute particles to dissolve faster.. Answer: agitating ;
temperature
◉ 26) If 50 mL of acetic acid is added to 100 mL of water at 60°C,
will it produce a saturated solution? Why, or why not?. Answer: No,
acetic acid is completely miscible in water so no amount of solute
will ever produce a saturated solution.
◉ 27) Increasing the temperature will permit more of a solid or
liquid solute to be dissolved in a liquid solvent but the opposite is
true of __________ dissolved in liquids.. Answer: gases
◉ 28) Which of these solutions are unsaturated?. Answer: 75.5 g of
LiCl at 20°C
2.00 g of PbCl2 at 80°C
100.2 g of NaNO3 at 60°C
,◉ 29) Which of these solutions are saturated?. Answer: 128 g of KI
at 0°C
8.22 g of Ba(OH)2 at 40°C
◉ 30) The degree of contrast between two opposing forces is called
_________.. Answer: polarity
◉ 31) To reduce the amount of CO2 that escapes from a bottle of
carbonated beverage when you open the cap, you should ________..
Answer: Put the bottle in a refrigerator for several hours before
opening the cap.
◉ 32) As a rule, solvents consisting of polar molecules will dissolve
substances that are ________.. Answer: polar
◉ 33) The general rule for determining solubility is:. Answer: "like
dissolves like"
◉ 34) When calcium chloride dissolves in water, it recrystallizes as
a(n) _______, with the chemical formula CaCl2 • 2H2O.. Answer:
hydrate
, ◉ 35) The net energy change when a solute is dissolved in a solution
is called _________.. Answer: enthalpy of solution
◉ 36) If the sum of the energy required to dissolve a solute is
greater than the energy released when the solute is solvated, then
the enthalpy of solution is _________ and the final temperature of the
solution is lower than its temperature before dissolution.. Answer:
endothermic
◉ 37) A negative value for the enthalpy of solution, ΔHsol, indicates
a(n) _________ process.. Answer: exothermic
◉ 38) Which of the following solutes would be the best substance to
produce a solution that could be placed in an instant hot pack?
Review table B-9.. Answer: HI
◉ vvv Lab: electrolytes vvv. Answer: vvv Lab: electrolytes vvv
◉ 1) Complete the table with data from the lab.
Distilled Water
Tap Water
