Question 1

​ Identify a condition under which a solute will not dissolve in a solvent.

Accepted Answer

A solute will not dissolve in a solvent if the solvent particles are more strongly attracted to each other than to the solute particles. This means the solvent does not have enough affinity to break apart the solute particles and distribute them throughout the solution.

Question 2

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...

Question 3

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

Accepted Answer

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

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, the ions are surrounded by water molecules, forming a hydration shell. This is because water is a polar molecule, meaning it has a positive end and a negative end. The positive end of the water molecule is attracted to the negative ions, and the negative end of the water molecule is attracted to the positive ions. This attraction forms a hydration shell around the ions, which helps to keep them dissolved in water.

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

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 specifically designed for making precise volume measurements of a solution, making it an appropriate choice for preparing a 2.00 M solution of NaCl in water.

Question 7

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 8

Match between columns
                        Premises:  Shaving cream

Accepted Answer

The Answer of  E mulsion and Sol and Foam is...

Question 9

Match between columns
                        Premises: Milk

Accepted Answer

The Answer of Solid foam and Sol and Foam and is...

Question 10

Match between columns
                        Premises:  Ink

Accepted Answer

The Answer of Sol and Solid foam and Aerosol and is...

Question 11

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 12

Emulsions are destroyed by adding salt.

Accepted Answer

Salt can destabilize emulsions by reducing the electrostatic repulsion between droplets, leading to coalescence and separation.

Question 13

Match between columns
                        Premises:  Fog

Accepted Answer

The Answer of Solid foam and Aerosol and Foam and is...

Question 14

​ Explain the solubility of cooking oil in water and gasoline.

Accepted Answer

The answer of ​ Explain the solubility of cooking oil...

Question 15

Identify a true statement of an immiscible solute.

Accepted Answer

The answer of Identify a true statement of an immiscible...

Question 16

Match between columns
                        Premises: Marshmallow

Accepted Answer

The Answer of Sol and  E mulsion and Foam is...

Question 17

​ How does the solubility of a gas change with change in pressure at a constant temperature?

Accepted Answer

The solubility of a gas in a liquid at a constant temperature follows Henry's law, which states that the solubility of a gas in a liquid is directly proportional to the pressure of the gas above the liquid. Therefore, if the pressure of the gas is doubled, its solubility in the liquid also doubles.

Question 18

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

Accepted Answer

In a colloid, the dispersing medium is the substance in which the colloidal particles are distributed, similar to how the solvent in a solution is the substance that dissolves the solute particles.

Quiz 7: Solutions and Colloids

Identify a condition under which a solute will not dissolve in a solvent.

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.

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

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

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

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

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.

Match the types of colloids with their examples.

Match the types of colloids with their examples.

Match the types of colloids with their examples.

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

Emulsions are destroyed by adding salt.

Match the types of colloids with their examples.

Explain the solubility of cooking oil in water and gasoline.

Identify a true statement of an immiscible solute.

Match the types of colloids with their examples.

How does the solubility of a gas change with change in pressure at a constant temperature?

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

Quiz 7: Solutions and Colloids

​ Identify a condition under which a solute will not dissolve in a solvent.

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.

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

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

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

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

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.

Match the types of colloids with their examples.

Match the types of colloids with their examples.

Match the types of colloids with their examples.

The following equation can be used when C represents either a M or %(w\w)concentration. CcVc = CdVd

Emulsions are destroyed by adding salt.

Match the types of colloids with their examples.

​ Explain the solubility of cooking oil in water and gasoline.

Identify a true statement of an immiscible solute.

Match the types of colloids with their examples.

​ How does the solubility of a gas change with change in pressure at a constant temperature?

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

Identify a condition under which a solute will not dissolve in a solvent.

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

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

Explain the solubility of cooking oil in water and gasoline.

How does the solubility of a gas change with change in pressure at a constant temperature?