Question 1

You want to remove as much CO2 gas as possible from a water solution. Which of the following treatments would be most effective?

Accepted Answer

A) cool the solution 
B) filter the solution 
C) boil the solution 
D) aerate the solution

Question 2

A mixture of sand and water would be an example of a colloidal suspension.

Accepted Answer

A) True 
 B)False

Question 3

A salt sample is placed into some water and nearly all of it dissolves without stirring or heating. The resulting solution is

Accepted Answer

A) saturated. 
B) supersaturated. 
C) unsaturated. 
D) impossible to determine.

Question 4

Calculate the number of moles of ZnCl, in 100 mL of 0.300 M solution.

Accepted Answer

A) 3.00 × 10 − 2 
B) 0.300 
C) 30.0 
D) 3.00

Question 5

Putting a celery stick in distilled water results in the uptake of water by the celery.

Accepted Answer

A) True 
 B)False

Question 6

Colloids can be stabilized by emulsifying agents.

Accepted Answer

A) True 
 B)False

Question 7

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

Accepted Answer

A) True 
 B)False

Question 8

Dialysis can be used to separate solutions from colloids.

Accepted Answer

A) True 
 B)False

Question 9

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

Accepted Answer

A) True 
 B)False

Question 10

During a surgical procedure, a wound was accidentally irrigated with deionized water, instead of normal saline.  What would one expect to happen?

Accepted Answer

A) There would be a net movement of water into the exposed tissue. 
B) Water would move out of the exposed tissue. 
C) Sodium ions would migrate out of the exposed cells. 
D) There would be no net effect since the solution was added externally.

Question 11

How many mL of 6.00 M HCl are needed to prepare 1500 mL of 0.200 M HCl solution?

Accepted Answer

A) 1.80 × 104 
B) 125 
C) 2.00 × 10 − 3 
D) 50.0

Question 12

Emulsions are destroyed by adding salt.

Accepted Answer

A) True 
 B)False

Question 13

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) True 
 B)False

Question 14

Match between columns
                        Premises:  Fog

Accepted Answer

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

Question 15

Rock candy (large table sugar crystals)can be produced by allowing a hot, saturated solution of sugar in water to cool off.

Accepted Answer

A) True 
 B)False

Question 16

A solution is prepared by dissolving 4.66 g of KCl in enough distilled water to give 250 mL of solution. KCl is a strong electrolyte. How will the freezing point of the solution be different from that of pure water? (Note: Kf for water is 1.86°C\M.)

Accepted Answer

A) solution will be 0.930°C lower than water 
B) solution will be 0.475°C lower than pure water 
C) solution will be 0.930°C higher than pure water 
D) solution will be 0.475°C higher than pure water

Question 17

An isotonic salt solution is 0.90% (w\w)NaCl in water. How many grams of NaCl are contained in 1.00 kg of such a solution?

Accepted Answer

A) 0.090 
B) 0.90 
C) 9.0 
D) 90

Question 18

Match between columns
                        Premises:  Shaving cream

Accepted Answer

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

Question 19

A solution is produced in which water is the solvent and there are four solutes. Which of the solutes can dissolve better if the solution is heated?

Accepted Answer

A) oxygen 
B) sodium bicarbonate 
C) argon 
D) more than one response is right

Question 20

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

Accepted Answer

A) True 
 B)False

Exam 7: Solutions and Colloids

You want to remove as much CO₂ gas as possible from a water solution. Which of the following treatments would be most effective?

A mixture of sand and water would be an example of a colloidal suspension.

A salt sample is placed into some water and nearly all of it dissolves without stirring or heating. The resulting solution is

Calculate the number of moles of ZnCl, in 100 mL of 0.300 M solution.

Putting a celery stick in distilled water results in the uptake of water by the celery.

Colloids can be stabilized by emulsifying agents.

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

Dialysis can be used to separate solutions from colloids.

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

During a surgical procedure, a wound was accidentally irrigated with deionized water, instead of normal saline. What would one expect to happen?

How many mL of 6.00 M HCl are needed to prepare 1500 mL of 0.200 M HCl solution?

Emulsions are destroyed by adding salt.

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

Match the types of colloids with their examples.

Rock candy (large table sugar crystals)can be produced by allowing a hot, saturated solution of sugar in water to cool off.

A solution is prepared by dissolving 4.66 g of KCl in enough distilled water to give 250 mL of solution. KCl is a strong electrolyte. How will the freezing point of the solution be different from that of pure water? (Note: K_f for water is 1.86°C\M.)

An isotonic salt solution is 0.90% (w\w) NaCl in water. How many grams of NaCl are contained in 1.00 kg of such a solution?

Match the types of colloids with their examples.

A solution is produced in which water is the solvent and there are four solutes. Which of the solutes can dissolve better if the solution is heated?

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