Question 1

The freezing point of a 0.500 M solution of sugar and a 0.500 M solution of KCl in water would be the same.

Accepted Answer

The freezing point depression of a solution depends on the number of particles in solution. KCl dissociates into two ions (K+ and Cl-), effectively doubling the number of particles compared to the sugar solution, which does not dissociate. Therefore, the freezing point of the 0.500 M KCl solution would be lower than that of the 0.500 M sugar solution.

Question 2

The dispersing medium in a colloid is analogous to the solvent in a solution.

Accepted Answer

In a colloid, the dispersing medium is the continuous medium in which the colloidal particles are suspended or dispersed. This is analogous to the solvent in a solution, which is the continuous medium in which the solute is dissolved.

Question 3

When preparing a 2.00 M solution of NaCl in water,a volumetric flask could be used to measure the volume of the solution.

Accepted Answer

A volumetric flask is designed to measure the volume of a specific amount of solution accurately, making it the appropriate tool for preparing a specific molarity solution.

Question 4

When an ionic substance dissolves,the solvated ions will all always be surrounded by water molecules.

Accepted Answer

When an ionic substance dissolves in water, the ions become surrounded by water molecules, forming a solvation shell. This is because the water molecules have a polar nature and can interact with the charged ions, stabilizing them in solution.

Question 5

The longer it takes for a substance to dissolve to form a solution,the lower its solubility will be.

Accepted Answer

Solubility is a measure of how much of a substance can dissolve in a given amount of solvent at a specific temperature and pressure, and it does not directly correlate with the rate at which the substance dissolves.

Question 6

The %(w/v)of a solution is defined as:

Accepted Answer

The answer of The %(w/v)of a solution is defined as:...

Question 7

The following equation can be used when C represents either a M or %(w/w)concentration. C_cV_c = C_dV_d

Accepted Answer

The equation seems to represent a form of the dilution equation (C1V1 = C2V2), which is used for calculating concentrations and volumes before and after dilution. However, the equation as given, with symbols like "_{" and "}", does not clearly represent a known scientific equation and appears to be incorrectly formatted or encoded. Additionally, concentration units like M (molarity) and %(w/w) (percent weight/weight) are not directly interchangeable without conversion, as they represent different types of concentration measurements.

Question 8

When preparing an aqueous solution of a salt,one must always be able to observe some undissolved material to be sure that it is saturated.

Accepted Answer

The answer of When preparing an aqueous solution of a...

Quiz 7: Solutions and Colloids