Question 1

Which of the following salts will have its solubility significantly increased when the pH of the solution is lowered (acid added)?

Accepted Answer

CaCO3

Question 2

A saturated solution of Ca(OH)2 is prepared in pure water at 25°C. Given $$K_{sp} = 5.5 	imes 10$$^{-6}$$, what is the pH of the solution?

Accepted Answer

$$	ext{pH} = 12.37$$

Question 3

Which of the following statements about spontaneous processes is TRUE?

Accepted Answer

A spontaneous process always increases the entropy of the universe.

Question 4

Which of the following best describes the effect of adding NH$$_3 to a $$saturated solution of Zn(OH)$$_2$$?

Accepted Answer

The solubility of Zn(OH)$$_2$$ increases due to complex ion formation.

Question 5

Calculate the molar solubility of Ca(OH)$$_2 in a $$solution buffered to pH = 12.00 at 25°C. ($$K_{sp} = 5.5 	imes 10$$^{-6}$$)

Accepted Answer

$$1.1 	imes 10$$^{-2}$$ M

Question 6

Which of the following processes will result in a positive entropy change ($$\Delta S \u003e 0$$)?

Accepted Answer

Sublimation of dry ice (CO$$_2) to CO$_2$$ gas

Question 7

Which of the following is TRUE regarding the third law of thermodynamics?

Accepted Answer

The entropy of a perfect crystal at absolute zero is zero.

Question 8

Which of the following will NOT affect the value of $$K_{sp}$$ for a given salt?

Accepted Answer

Addition of a common ion

Question 9

Given the reaction: $$2 	ext{NO}(g) + 	ext{O}_2(g) ightarrow 2 	ext{NO}_2(g)$$, predict the sign of $$\Delta S$$ for the system.

Accepted Answer

$$\Delta S \u003c 0$$

Question 10

Which of the following best explains why the entropy of water increases as it is heated from 0°C to 100°C?

Accepted Answer

The number of microstates available to the molecules increases.

Question 11

Which of the following is a complex ion?

Accepted Answer

[Fe(CN)_6]^{3-}

Question 12

A solution contains both Ag$$^+$$ and Cu$$^{2+}. $$Which ligand would most effectively separate Ag$$^+$$ from Cu$$^{2+} by $$forming a stable complex?

Accepted Answer

NH$$_3$$

Question 13

Which of the following statements about entropy is FALSE?

Accepted Answer

Entropy decreases as temperature increases.

Question 14

Which of the following best describes an irreversible process?

Accepted Answer

A process that cannot be exactly reversed to restore both system and surroundings to their original states.

Question 15

Which of the following will increase the solubility of AgOH(s) in water?

Accepted Answer

Adding HNO3

Question 16

Which of the following best describes the molecular motion that contributes to entropy?

Accepted Answer

Translational, vibrational, and rotational motion

Question 17

Which of the following is TRUE about the effect of adding a common ion to a saturated solution?

Accepted Answer

It decreases the solubility of the salt.

Question 18

Which of the following best describes the entropy change when ice melts at 0°C?

Accepted Answer

$$\Delta S \u003e 0$$

Question 19

Which of the following is the correct expression for the entropy change of a system when heat $$q_{rev} is $$transferred at constant temperature $$T$$?

Accepted Answer

$$\Delta S = \frac{q_{rev}}{T}$$

Question 20

Which of the following will increase the number of microstates ($$W) $$for a system?

Accepted Answer

Increasing the number of molecules

Solubility Equilibria, Thermodynamics, and Entropy: Advanced Concepts in General Chemistry

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