Ch 8 Solutions, Acids, and Bases Unit Quiz

In order for a solution to form,

• one substance must dissolve in another.

• a solid must dissolve in a liquid.

• the solvent must be water.

• a gas must dissolve in a liquid.

Study Figure 8-1. When the ionic compound KI is dissolved in water, the I^- ions are pulled into solution by the attraction between

• the K⁺ and I^- ions.

• the K⁺ ion and the negative end of a water molecule.

• the I^- ion and the negative end of a water molecule.

• the I^- ion and the positive end of a water molecule.

Tags

NGSS.HS-PS1-3

NGSS.HS-PS2-4

A salt is dissolved in water, which has a boiling point of 100°C. The boiling point of the solution will be

• greater than 100°C.

• less than 100°C.

• exactly equal to 100°C.

• exactly equal to 0°C.

The more particles a solute forms in solution, the greater is its effect on the freezing point of the solution. Which of the following will lower the freezing point the most if 1 mol of it is added to 1 L of water?

• the molecular compound propanol, C₂H₅OH

• the ionic compound NaCl

• the ionic compound MgCl₂

• the ionic compound AlCl₃

During the formation of a solution, energy is

• either released or absorbed.

• neither released nor absorbed.

• released only.

• absorbed only.

Tags

NGSS.HS-PS1-4

In an exothermic reaction, the amount of energy required to break the attractions among the solute particles and among the solvent particles is

• greater than the energy released as attractions form between solute and solvent particles.

• less than the energy released as attractions form between solute and solvent particles.

• equal to the energy released as attractions form between solute and solvent particles.

• equal to the heat of solution.

Tags

NGSS.HS-PS3-4

All materials that are considered to be insoluble will dissolve in a solvent to a very small extent. The rate of dissolving of a rock in a streambed would not be increased by which of the following?

• breaking the rock into smaller pieces

• moving the rock to a faster-moving current

• moving the rock to warmer water

• reducing the exposure of the rock to the water

A student dissolved equal amounts of salt in equal amounts of warm water, room-temperature water, and ice water. Which of the following is true?

• The salt dissolved most quickly in the warm water.

• The salt dissolved most quickly in the room-temperature water.

• The salt dissolved most quickly in the ice water.

• None of the above

Tags

NGSS.HS-PS1-5

The maximum amount of a solute that will dissolve in a certain amount of solvent at a given temperature is that solute’s

• solubility.

• concentration.

• degree of saturation.

• rate of solution.

The solubility of carbon dioxide gas in water can be increased by

• increasing the temperature.

• agitating the mixture.

• increasing the pressure.

• using more solvent.