Welcome to the quiz for TAKS 4_9D

1) What will have the highest solubility at 40 ^oC?

A) NaNO₃
B) KI
C) NH₃
D) NaCl
E) KClO₃

2) What compound has almost no increase in solubility as temperature goes up?

A) NaNO₃
B) KI
C) NH₃
D) NaCl
E) KClO₃

3) Which compound shows a negative correlation (negative slope) between temperature and solubility?

A) NaNO₃
B) KI
C) NH₃
D) NaCl
E) KClO₃

4) A student dissolves 30 grams in an unknown compound in 50 grams of water at 39^oC. What compound was the student testing?

A) Ce₂(SO₄)₃
B) KCl
C) NH₄Cl
D) KNO₃
E) NaNO₃

5) Which salt has the highest solubility at 65 ^oC?

A) Ce₂(SO₄)₃
B) KCl
C) NH₄Cl
D) KNO₃
E) NaNO₃

6) If there are 20 grams of NH₃ in 100 grams of water at 30 ^oC, what type of solution will you have?

A) supersaturated
B) saturated
C) unsaturated
D) none of the above

7) If there are 85 grams of KNO₃ in 100 grams of water at 50 ^oC, what type of solution will you have?

A) supersaturated
B) saturated
C) unsaturated
D) none of the above

8) What is the approximate temperature where the solubility of NH₃ and KNO₃ are equal?

A) 20 ^oC
B) 30 ^oC
C) 40 ^oC
D) 50 ^oC
E) 60 ^oC

9) What compound has the greatest solubility at room temperature (room temperature equals 25 ^oC)?

A) Ce₂(SO₄)₃
B) KCl
C) NH₄Cl
D) KNO₃
E) NaNO₃

10) Between 30 ^oC and 60 ^oC what compound exhibits the greatest increase in solubility?

A) KNO₃
B) KI
C) NH₃
D) NaCl
E) KClO₃

11) A student finds that just over 3.0 grams of an unknown compound dissolves in 20.0 grams of water at 0 ^oC. What is the unknown compound?

A) Ce₂(SO₄)₃
B) KCl
C) NH₄Cl
D) KI
E) NaNO₃

12) At 10 ^oC , which compound can have a mass that is dissolved that is greater than the mass of water that dissolves it?

A) Ce₂(SO₄)₃
B) KCl
C) NH₄Cl
D) KI
E) NaNO₃

13) If there are 20 grams of KClO₃ in 50 grams of water at 80 ^oC, what type of solution will you have?

A) supersaturated
B) saturated
C) unsaturated
D) none of the above

14) If there are 45 grams of NaNO₃ in 100 grams of water at 10 ^oC, how much more will you need to add to have a saturated solution?

A) 10 grams
B) 20 grams
C) 25 grams
D) 35 grams
E) zero, it is already a saturated solution

15) Which of the following factors both affect the solubility of a particular substance?

A) temperature and the nature of solute and solvent
B) temperature and degree of mixing
C) particle size and degree of mixing
D) particle size and temperature

16) How does solubility generally vary as the temperature increases?

A) decreases
B) increases
C) remains the same
D) none of the above

17) Which of the following operations usually makes a substance dissolve faster in a solvent?

A) agitation
B) raising the temperature
C) crushing the substance to a powder
D) All of the above

18) Increasing the temperature of a solution will generally _____.

A) increase the rate at which a solute dissolves
B) increase the amount of solute that dissolves
C) both a and b
D) neither a nor b

19) Which of the following expressions is generally used for solubility?

A) grams of solute per 100 grams of solvent
B) grams of solute per 100 milliliters of solvent
C) grams of solute per 100 grams of solution
D) grams of solute per 100 milliliters of solution

20) Which of the following pairs of substances are miscible (they dissolve in each other)?

A) water and rubbing alcohol
B) water and sodium chloride
C) water and oxygen
D) water and gasoline

21) If a crystal added to an aqueous solution causes many particles to come out of the solution, the original solution was _____.

A) saturated
B) unsaturated
C) supersaturated
D) an emulsion

22) Holding the temperature constant while adding more solute to a solution that already has solute crystals at the bottom of the container _____.

A) makes the solution more concentrated
B) causes the solution to become supersaturated
C) causes more solute crystals to appear at the bottom of the container
D) None of the above

23) What happens to the solubility of a gas, in a liquid, if the partial pressure of the gas above the liquid decreases?

A) The solubility decreases.
B) The solubility increases.
C) The solubility remains the same.
D) None of the above

24) What does not exist in a supersaturated solution?

A) undissolved solute
B) dissolved solute
C) solvent vapors
D) None of the above

25) If the pressure of a gas above a liquid is increased (at constant temperature), the solubility of the gas in the liquid

A) remains unchanged
B) increases
C) decreases
D) would be impossible to calculate
E) None of the above

26) The solubility of a gas in a liquid is _____.

A) proportional to the square root of the pressure of the gas above the liquid
B) directly proportional to the pressure of the gas above the liquid
C) inversely proportional to the pressure of the gas above the liquid
D) unrelated to the pressure of the gas above the liquid

27) In general, as the temperature of a solution composed of a gas in a liquid is increased, the solubility of the gas ...

A) increases
B) decreases
C) remains the same
D) none of the above