Question 1

Which step in the solution formation process is always exothermic, as shown in the diagram?

Accepted Answer

Step 3: Formation of solute-solvent interactions ($$\Delta H_3$)

Question 2

According to the graph, which salt shows the greatest increase in solubility as temperature rises from 0°C to 100°C?

Accepted Answer

KNO$$_3$$

Question 3

Which of the following statements best explains why 'like dissolves like'?

Accepted Answer

Substances with similar intermolecular forces have comparable solute-solvent attractions, making solution formation energetically favorable.

Question 4

A student wants to dissolve more KNO$$_3 in $$water. Based on the solubility graph, what should they do?

Accepted Answer

Increase the temperature of the water.

Question 5

Which of the following is NOT a colligative property?

Accepted Answer

Solubility

Question 6

If the enthalpy of solution ($$\Delta H_{soln}) is $$highly endothermic, what is most likely to happen?

Accepted Answer

The solution will not form unless the entropy increase is large enough to make the process spontaneous.

Question 7

Which concentration unit is defined as moles of solute per kilogram of solvent?

Accepted Answer

Molality ($$m)$$

Question 8

A gas is dissolved in water at a partial pressure of 0.5 atm. If $$k_H = 2.0 	imes 10$$^{-2}$$ M/atm, what is the concentration of the gas in water?

Accepted Answer

$$1.0 	imes 10$$^{-2}$$ M

Question 9

Which of the following substances would be most soluble in benzene (C$$_6H$_6$$)?

Accepted Answer

CH$$_3CH$_2CH$_2CH$_2CH$_3$$

Question 10

Which of the following best describes a supersaturated solution?

Accepted Answer

A solution containing more solute than can normally dissolve at a given temperature.

Question 11

Which salt’s solubility decreases as temperature increases, according to the graph?

Accepted Answer

Ce$$_2(SO$_4$$)$$_3$$

Question 12

Which process is responsible for the increase in entropy during solution formation?

Accepted Answer

Mixing of solute and solvent molecules, leading to greater randomness

Question 13

Which of the following is true about the effect of pressure on solubility?

Accepted Answer

Pressure affects only the solubility of gases.

Question 14

Which of the following pairs of substances would have the most favorable $$\Delta H_{soln}$$?

Accepted Answer

CH$$_3CH$_2OH $$and (CH$$_3$$)$$_2NH$$

Question 15

Which term describes liquids that mix in all proportions?

Accepted Answer

Miscible

Question 16

A solution is prepared by dissolving 10 g of NaCl in 100 g of water. If the solution is in equilibrium with undissolved NaCl, what type of solution is it?

Accepted Answer

Saturated

Question 17

Which of the following is a characteristic of colloids?

Accepted Answer

They are heterogeneous mixtures with particles larger than those in solutions.

Question 18

Which of the following would increase the solubility of a gas in water?

Accepted Answer

Increasing the partial pressure of the gas above the solution

Question 19

Which of the following is the correct expression for Henry’s Law?

Accepted Answer

$$S_g = kP_g$$

Question 20

Which of the following substances would have the greatest solubility in water?

Accepted Answer

KCl

Solutions: Formation, Properties, and Solubility

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