Question 1

The solubility of helium gas in water is greater at 25 °C than at 50 °C.

Accepted Answer

A) True 
 B)False

Question 2

An unknown amount of water is added to 75 mL of a 3.5 M aqueous glucose solution. What can be said about the concentration of the resulting solution?

Accepted Answer

A) The concentration of the resultant glucose solution will be less than 3.5 M. 
B) The concentration of the resultant glucose solution will be greater than 3.5 M. 
C) The concentration of the resultant glucose solution will remain the same because the amount of glucose has not changed. 
D) It is impossible to say anything about the concentration of the resultant glucose solution because the amount of added water has not been provided. 
A) The concentration of the resultant glucose solution will be less than 3.5 M. 
B) The concentration of the resultant glucose solution will be greater than 3.5 M. 
C) The concentration of the resultant glucose solution will remain the same because the amount of glucose has not changed. 
D) It is impossible to say anything about the concentration of the resultant glucose solution because the amount of added water has not been provided.

Question 3

Which substance is a colloid?

Accepted Answer

A) mayonnaise 
B) a dental filling 
C) mint chocolate chip ice cream 
D) gasoline 
A) mayonnaise 
B) a dental filling 
C) mint chocolate chip ice cream 
D) gasoline

Question 4

A saline solution used in intravenous drips for patients who cannot take oral fluids contains 0.92% (w/v)NaCl in water. What volume of the saline solution must be administered to the patient in order to deliver 7.7 g of NaCl?

Accepted Answer

A) 8.4 mL of saline solution 
B) 840 mL of saline solution 
C) 7.1 mL of saline solution 
D) 140 mL of saline solution 
A) 8.4 mL of saline solution 
B) 840 mL of saline solution 
C) 7.1 mL of saline solution 
D) 140 mL of saline solution

Question 5

Which ionic compound is not soluble in water?

Accepted Answer

A) NaCl 
B) AgCl 
C) (NH4)2SO4 
D) Ca(CH3CO2)2 
A) NaCl 
B) AgCl 
C) (NH4)2SO4 
D) Ca(CH3CO2)2

Question 6

A nonvolatile solute makes it harder for solvent molecules to form a crystalline solid, thus decreasing its melting point.

Accepted Answer

A) True 
 B)False

Question 7

The maximum level of lead allowed in drinking water is 15 $\mu$g/kg. What is this concentration in units of parts per million?

Accepted Answer

A) 15 ppm 
B) 1.5 × 10-2 ppm 
C) 1.5 × 104 ppm 
D) 3.1 ppm 
A) 15 ppm 
B) 1.5 × 10-2 ppm 
C) 1.5 × 104 ppm 
D) 3.1 ppm

Question 8

Heptane (C7H16)is soluble in water.

Accepted Answer

A) True 
 B)False

Question 9

Dialysis is a process that involves the selective passage of water, protein molecules, and ions across a semipermeable membrane.

Accepted Answer

A) True 
 B)False

Question 10

The solubility of a substance is best described by which of the following?

Accepted Answer

A) the ability of the substance to dissolve in water 
B) the ability of the substance to dissociate into ions when dissolved in water 
C) the maximum amount of a substance that can dissolve in a specific amount of solvent 
D) the mass of solvent necessary to completely dissolve 100 g of the substance 
A) the ability of the substance to dissolve in water 
B) the ability of the substance to dissociate into ions when dissolved in water 
C) the maximum amount of a substance that can dissolve in a specific amount of solvent 
D) the mass of solvent necessary to completely dissolve 100 g of the substance

Question 11

Any mixture of two or more components is a solution.

Accepted Answer

A) True 
 B)False

Question 12

Vitamin D is tested for its solubility in water and benzene (C6H6), and is found to be insoluble in water and soluble in benzene. These solubility results indicate that Vitamin D is most likely a nonpolar compound.

Accepted Answer

A) True 
 B)False

Question 13

A solution containing the maximum number of grams of solute that can dissolve in the solvent is said to be supersaturated.

Accepted Answer

A) True 
 B)False

Question 14

The solubility of gases increases with increasing temperature.

Accepted Answer

A) True 
 B)False

Question 15

What is the concentration of a solution formed by diluting 25.0 mL of a 3.2 M NaCl solution to 135.0 mL?

Accepted Answer

A) 17 M NaCl 
B) 0.59 M NaCl 
C) 0.50 M NaCl 
D) 2.7 M NaCl 
A) 17 M NaCl 
B) 0.59 M NaCl 
C) 0.50 M NaCl 
D) 2.7 M NaCl

Question 16

The attraction of an ion with a dipole in a molecule is called

Accepted Answer

A) a dipole-dipole interaction. 
B) an ion-dipole interaction. 
C) hydrogen bonding. 
D) London dispersion forces. 
E) van der Waals forces. 
A) a dipole-dipole interaction. 
B) an ion-dipole interaction. 
C) hydrogen bonding. 
D) London dispersion forces. 
E) van der Waals forces.

Question 17

Compared to the pure solvent, the freezing point depression caused by adding 0.05 mol of sucrose to 1.0 L of water is greater than the boiling point elevation of the same solution.

Accepted Answer

A) True 
 B)False

Question 18

A 6.10 M NaCl solution is made by adding 356 g of NaCl to a flask that contains 1.00 L of water.

Accepted Answer

A) True 
 B)False

Question 19

What is the molarity of a solution made by dissolving 3.09 moles of NaCl in 1.50 L of solution?

Accepted Answer

A) 4.64 M NaCl 
B) 4.85 M NaCl 
C) 2.06 M NaCl 
D) 0.673 M NaCl 
A) 4.64 M NaCl 
B) 4.85 M NaCl 
C) 2.06 M NaCl 
D) 0.673 M NaCl

Question 20

Magnesium hydroxide can be made by the reaction shown below. If a chemist requires 0.725 moles of NaOH for this reaction, what volume of a 1.50 M NaOH solution is needed to provide this amount? MgCl2(aq)+ 2 NaOH(aq)$\rightarrow$ Mg(OH)2(s)+ 2 NaCl(aq)

Accepted Answer

A) 0.483 L of a 1.50 M NaOH solution 
B) 0.967 L of a 1.50 M NaOH solution 
C) 1.09 L of a 1.50 M NaOH solution 
D) 967 mL of a 1.50 M NaOH solution 
A) 0.483 L of a 1.50 M NaOH solution 
B) 0.967 L of a 1.50 M NaOH solution 
C) 1.09 L of a 1.50 M NaOH solution 
D) 967 mL of a 1.50 M NaOH solution

Exam 8: Solutions

The solubility of helium gas in water is greater at 25 °C than at 50 °C.

An unknown amount of water is added to 75 mL of a 3.5 M aqueous glucose solution. What can be said about the concentration of the resulting solution?

Which substance is a colloid?

A saline solution used in intravenous drips for patients who cannot take oral fluids contains 0.92% (w/v)NaCl in water. What volume of the saline solution must be administered to the patient in order to deliver 7.7 g of NaCl?

Which ionic compound is not soluble in water?

A nonvolatile solute makes it harder for solvent molecules to form a crystalline solid, thus decreasing its melting point.

The maximum level of lead allowed in drinking water is 15 μ\muμ g/kg. What is this concentration in units of parts per million?

Heptane (C7H16)is soluble in water.

Dialysis is a process that involves the selective passage of water, protein molecules, and ions across a semipermeable membrane.

The solubility of a substance is best described by which of the following?

Any mixture of two or more components is a solution.

Vitamin D is tested for its solubility in water and benzene (C6H6), and is found to be insoluble in water and soluble in benzene. These solubility results indicate that Vitamin D is most likely a nonpolar compound.

A solution containing the maximum number of grams of solute that can dissolve in the solvent is said to be supersaturated.

The solubility of gases increases with increasing temperature.

What is the concentration of a solution formed by diluting 25.0 mL of a 3.2 M NaCl solution to 135.0 mL?

The attraction of an ion with a dipole in a molecule is called

Compared to the pure solvent, the freezing point depression caused by adding 0.05 mol of sucrose to 1.0 L of water is greater than the boiling point elevation of the same solution.

A 6.10 M NaCl solution is made by adding 356 g of NaCl to a flask that contains 1.00 L of water.

What is the molarity of a solution made by dissolving 3.09 moles of NaCl in 1.50 L of solution?

Magnesium hydroxide can be made by the reaction shown below. If a chemist requires 0.725 moles of NaOH for this reaction, what volume of a 1.50 M NaOH solution is needed to provide this amount? MgCl2(aq)+ 2 NaOH(aq) →\rightarrow→ Mg(OH)2(s)+ 2 NaCl(aq)

Matter and Measurement

Atoms and the Periodic Table

Ionic Compounds

Covalent Compounds

Chemical Reactions

Energy Changes, Reaction Rates, and Equilibrium

Gases, Liquids, and Solids

Acids and Bases

Nuclear Chemistry

Introduction to Organic Molecules and Functional Groups

Alkanes

Unsaturated Hydrocarbons

Organic Compounds That Contain Oxygen, Halogen, or Sulfur

The Three-Dimensional Shape of Molecules

Aldehydes and Ketones

Carboxylic Acids, Esters, and Amides

Amines and Neurotransmitters

Lipids

Carbohydrates

Amino Acids, Proteins, and Enzymes

Nucleic Acids and Protein Synthesis

Digestion and the Conversion of Food Into Energy

Carbohydrate, Lipid, and Protein Metabolism

Filters

The maximum level of lead allowed in drinking water is 15 $\mu$ g/kg. What is this concentration in units of parts per million?

Heptane (C₇H₁₆)is soluble in water.

Vitamin D is tested for its solubility in water and benzene (C₆H₆), and is found to be insoluble in water and soluble in benzene. These solubility results indicate that Vitamin D is most likely a nonpolar compound.

Magnesium hydroxide can be made by the reaction shown below. If a chemist requires 0.725 moles of NaOH for this reaction, what volume of a 1.50 M NaOH solution is needed to provide this amount? MgCl₂(aq)+ 2 NaOH(aq) $\rightarrow$ Mg(OH)₂(s)+ 2 NaCl(aq)