Question 1

Which of the following best describes a solution?

Accepted Answer

A homogeneous mixture in which one substance is uniformly dispersed in another.

Question 2

In a mixture of 10 g of NaCl and 100 mL of water, which is the solute and which is the solvent?

Accepted Answer

NaCl is the solute; water is the solvent.

Question 3

Which of the following statements best explains why NaCl dissolves in water?

Accepted Answer

NaCl is ionic and water is polar, allowing the ions to be surrounded by water molecules through hydration.

Question 4

Which of the following compounds will NOT dissolve in water?

Accepted Answer

Gasoline

Question 5

Which of the following best describes a strong electrolyte?

Accepted Answer

A substance that completely dissociates into ions in water and conducts electricity well.

Question 6

Which of the following is an example of a nonelectrolyte?

Accepted Answer

CH3OH

Question 7

A solution in which more solute can still dissolve at a given temperature is called:

Accepted Answer

Unsaturated

Question 8

Which of the following best explains why sugar dissolves more readily in hot tea than in iced tea?

Accepted Answer

The solubility of solids in water increases with increasing temperature.

Question 9

According to Henry’s Law, what happens to the solubility of a gas in a liquid as the pressure of the gas above the liquid increases?

Accepted Answer

The solubility increases.

Question 10

Which of the following ionic compounds is expected to be soluble in water based on the solubility rules?

Accepted Answer

NaNO3

Question 11

A student adds 80 g of KBr to 100 g of water at 40°C. If the solubility of KBr at this temperature is 80 g/100 g H2O, what type of solution is formed?

Accepted Answer

Saturated

Question 12

Which of the following best describes the process of hydration in the dissolution of NaCl in water?

Accepted Answer

Water molecules surround and stabilize the Na+ and Cl- ions, reducing their attraction to each other.

Question 13

Which of the following best explains why nonpolar solutes do not dissolve in water?

Accepted Answer

There are no significant attractions between nonpolar solute particles and polar water molecules.

Question 14

Which of the following is true about the rate of dissolving and crystallization in a saturated solution?

Accepted Answer

The rates of dissolving and crystallization are equal.

Question 15

Which of the following best describes the phrase 'like dissolves like'?

Accepted Answer

Solutes dissolve best in solvents with similar polarity.

Question 16

A can of soda is opened on a hot day. Compared to opening it on a cold day, what will you observe and why?

Accepted Answer

More bubbles escape because gas solubility decreases with temperature.

Question 17

Which of the following is a correct representation of the dissociation of NaCl in water?

Accepted Answer

$$\mathrm{NaCl(s) \xrightarrow{H_2O} Na^+(aq) + Cl^-(aq)}$$

Question 18

Which of the following best describes a weak electrolyte?

Accepted Answer

A substance that partially ionizes in water, producing a weak current.

Question 19

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

Accepted Answer

Decreasing the temperature and increasing the pressure.

Question 20

A solution is prepared by mixing 60 mL of ethyl alcohol and 30 mL of methyl alcohol. Which is the solvent?

Accepted Answer

Ethyl alcohol

Solutions: Properties, Formation, and Solubility in General Chemistry

Guida di studio - Domande di pratica

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