Question 1

If the shell of a raw egg is carefully dissolved away,and the egg in its flexible membrane is then placed in distilled water,the egg's volume will expand.Explain.

Accepted Answer

The answer of If the shell of a raw egg...

Question 2

If the density of a solution is less than 1.0 g/mL,its molarity will be greater than its molality.

Accepted Answer

A) True 
 B)False

Question 3

A 7.112 M solution of sulfuric acid (H2SO4)in water has a density of 1.395 g/mL.What is its molality?

Accepted Answer

Question 4

Ideal solutions do not conform to Raoult's Law.

Accepted Answer

A) True 
 B)False

Question 5

Raoult's Law relates the vapor pressure of a solvent above a solution to the mole fraction of the solvent and the vapor pressure of the pure solvent.

Accepted Answer

A) True 
 B)False

Question 6

Safrole is used as a topical antiseptic.Calculate the vapor pressure of a solution prepared by dissolving 0.75 mol of safrole in 950 g of ethanol (  
= 46.07 g/mol).P°ethanol = 50.0 torr at 25°C.

Accepted Answer

A) 1.8 torr 
B) 11 torr 
C) 15 torr 
D) 40 torr 
E) 48 torr 
A) 1.8 torr 
B) 11 torr 
C) 15 torr 
D) 40 torr 
E) 48 torr

Question 7

What is the molality of a solution prepared by dissolving 86.9 g of diethyl ether,C4H10O,in 425 g of benzene,C6H6?

Accepted Answer

A) 0.362 m 
B) 0.498 m 
C) 2.01 m 
D) 2.76 m 
E) None of these choices is correct. 
A) 0.362 m 
B) 0.498 m 
C) 2.01 m 
D) 2.76 m 
E) None of these choices is correct.

Question 8

Heats of hydration may be either positive or negative.

Accepted Answer

A) True 
 B)False

Question 9

Dimethylglyoxime,DMG,is an organic compound used to test for aqueous nickel(II)ions.A solution prepared by dissolving 65.0 g of DMG in 375 g of ethanol boils at 80.3°C.What is the molar mass of DMG?
Kb = 1.22°C/m,boiling point of pure ethanol = 78.5°C

Accepted Answer

A) 44.1 g/mol 
B) 65.8 g/mol 
C) 117 g/mol 
D) 131.6 g/mol 
E) 553 g/mol 
A) 44.1 g/mol 
B) 65.8 g/mol 
C) 117 g/mol 
D) 131.6 g/mol 
E) 553 g/mol

Question 10

Two aqueous solutions are prepared: 1.00 m Na2CO3 and 1.00 m LiCl.Which of the following statements is true?

Accepted Answer

A) The Na2CO3 solution has a higher osmotic pressure and higher vapor pressure than the LiCl solution. 
B) The Na2CO3 solution has a higher osmotic pressure and higher boiling point than the LiCl solution. 
C) The Na2CO3 solution has a lower osmotic pressure and lower vapor pressure than the LiCI solution. 
D) The Na2CO3 solution has a lower osmotic pressure and higher boiling point than the LiCl solution. 
E) None of these statements is true. 
A) The Na2CO3 solution has a higher osmotic pressure and higher vapor pressure than the LiCl solution. 
B) The Na2CO3 solution has a higher osmotic pressure and higher boiling point than the LiCl solution. 
C) The Na2CO3 solution has a lower osmotic pressure and lower vapor pressure than the LiCI solution. 
D) The Na2CO3 solution has a lower osmotic pressure and higher boiling point than the LiCl solution. 
E) None of these statements is true.

Question 11

Potassium fluoride is used for frosting glass.Calculate the molarity of a solution prepared by dissolving 78.6 g of KF in enough water to produce 225 mL of solution.

Accepted Answer

A) 0.304 M 
B) 0.349 M 
C) 1.35 M 
D) 3.29 M 
E) 6.01 M 
A) 0.304 M 
B) 0.349 M 
C) 1.35 M 
D) 3.29 M 
E) 6.01 M

Question 12

Cinnamaldehyde (  
= 132.15 g/mol)is used as a flavoring agent.What mass of cinnamaldehyde must be added to 175 g of ethanol to give a solution whose boiling point is 82.7°C?
Kb = 1.22°C/m,boiling point of pure ethanol = 78.5°C

Accepted Answer

A) 62.4 g 
B) 67.8 g 
C) 76.2 g 
D) 78.5 g 
E) 79.6 g 
A) 62.4 g 
B) 67.8 g 
C) 76.2 g 
D) 78.5 g 
E) 79.6 g

Question 13

Human blood has a molar concentration of solutes of 0.30 M.What is the osmotic pressure of blood at 25°C?

Accepted Answer

A) 0.012 atm 
B) 0.62 atm 
C) 6.8 atm 
D) 7.3 atm 
E) >10.atm 
A) 0.012 atm 
B) 0.62 atm 
C) 6.8 atm 
D) 7.3 atm 
E) >10.atm

Question 14

Calculate the molarity of a solution prepared by diluting 1.85 L of 6.5 M KOH to 11.0 L.

Accepted Answer

A) 0.28 M 
B) 0.91 M 
C) 1.1 M 
D) 3.1 M 
E) 3.9 M 
A) 0.28 M 
B) 0.91 M 
C) 1.1 M 
D) 3.1 M 
E) 3.9 M

Question 15

Colligative properties depend on

Accepted Answer

A) the chemical properties of the solute. 
B) the chemical properties of the solvent. 
C) the masses of the individual ions. 
D) the molar mass of the solute. 
E) the number of particles dissolved. 
A) the chemical properties of the solute. 
B) the chemical properties of the solvent. 
C) the masses of the individual ions. 
D) the molar mass of the solute. 
E) the number of particles dissolved.

Question 16

Calcium nitrite is used as a corrosion inhibitor in lubricants.What is the molality of a solution prepared by dissolving 18.5 g of calcium nitrite in 83.5 g of distilled water?

Accepted Answer

A) 0.0342 m 
B) 0.0855 m 
C) 0.222 m 
D) 0.444 m 
E) 1.68 m 
A) 0.0342 m 
B) 0.0855 m 
C) 0.222 m 
D) 0.444 m 
E) 1.68 m

Question 17

Two aqueous solutions are prepared: 2.0 m Cu(NO3)2 and 2.0 m NaBr.Which of the following statements is true?

Accepted Answer

A) The Cu(NO3)2 solution has a higher vapor pressure and lower freezing point than the NaBr solution. 
B) The Cu(NO3)2 solution has a higher vapor pressure and higher freezing point than the NaBr solution. 
C) The Cu(NO3)2 solution has a lower vapor pressure and lower freezing point than the NaBr solution. 
D) The Cu(NO3)2 solution has a lower vapor pressure and higher freezing point than the NaBr solution. 
E) None of these statements is true. 
A) The Cu(NO3)2 solution has a higher vapor pressure and lower freezing point than the NaBr solution. 
B) The Cu(NO3)2 solution has a higher vapor pressure and higher freezing point than the NaBr solution. 
C) The Cu(NO3)2 solution has a lower vapor pressure and lower freezing point than the NaBr solution. 
D) The Cu(NO3)2 solution has a lower vapor pressure and higher freezing point than the NaBr solution. 
E) None of these statements is true.

Question 18

Which of the following sets of conditions could exist when two liquids which are completely miscible in one another are mixed?

Accepted Answer

A) ($\Delta$Hsoln > 0,entropy of system decreases) 
B) ($\Delta$Hsoln $\approx$ 0,entropy of system decreases) 
C) ($\Delta$Hsoln $\approx$ 0,entropy change of system $\approx$ 0) 
D) ($\Delta$Hsoln $\approx$ 0,entropy of system increases) 
E) None of these choices is correct. 
A) ($\Delta$Hsoln > 0,entropy of system decreases) 
B) ($\Delta$Hsoln $\approx$ 0,entropy of system decreases) 
C) ($\Delta$Hsoln $\approx$ 0,entropy change of system $\approx$ 0) 
D) ($\Delta$Hsoln $\approx$ 0,entropy of system increases) 
E) None of these choices is correct.

Question 19

How many moles of solute particles are present in 100.0 mL of 2.50 M (NH4)3PO4?

Accepted Answer

A) 0.100 mol 
B) 0.250 mol 
C) 0.500 mol 
D) 0.750 mol 
E) l.00 mol 
A) 0.100 mol 
B) 0.250 mol 
C) 0.500 mol 
D) 0.750 mol 
E) l.00 mol

Question 20

Which of the following aqueous solutions will have the lowest osmotic pressure?

Accepted Answer

A) 0.10 m KOH 
B) 0.10 m RbCl 
C) 0.05 m CaSO4 
D) 0.05 m BaCl2 
E) 0.10 m K2SO4 
A) 0.10 m KOH 
B) 0.10 m RbCl 
C) 0.05 m CaSO4 
D) 0.05 m BaCl2 
E) 0.10 m K2SO4

Exam 13: The Properties of Solutions

If the shell of a raw egg is carefully dissolved away,and the egg in its flexible membrane is then placed in distilled water,the egg's volume will expand.Explain.

If the density of a solution is less than 1.0 g/mL,its molarity will be greater than its molality.

A 7.112 M solution of sulfuric acid (H2SO4)in water has a density of 1.395 g/mL.What is its molality?

Ideal solutions do not conform to Raoult's Law.

Raoult's Law relates the vapor pressure of a solvent above a solution to the mole fraction of the solvent and the vapor pressure of the pure solvent.

Safrole is used as a topical antiseptic.Calculate the vapor pressure of a solution prepared by dissolving 0.75 mol of safrole in 950 g of ethanol ( = 46.07 g/mol).P°ethanol = 50.0 torr at 25°C.

What is the molality of a solution prepared by dissolving 86.9 g of diethyl ether,C4H10O,in 425 g of benzene,C6H6?

Heats of hydration may be either positive or negative.

Dimethylglyoxime,DMG,is an organic compound used to test for aqueous nickel(II)ions.A solution prepared by dissolving 65.0 g of DMG in 375 g of ethanol boils at 80.3°C.What is the molar mass of DMG? Kb = 1.22°C/m,boiling point of pure ethanol = 78.5°C

Two aqueous solutions are prepared: 1.00 m Na2CO3 and 1.00 m LiCl.Which of the following statements is true?

Potassium fluoride is used for frosting glass.Calculate the molarity of a solution prepared by dissolving 78.6 g of KF in enough water to produce 225 mL of solution.

Cinnamaldehyde ( = 132.15 g/mol)is used as a flavoring agent.What mass of cinnamaldehyde must be added to 175 g of ethanol to give a solution whose boiling point is 82.7°C? Kb = 1.22°C/m,boiling point of pure ethanol = 78.5°C

Human blood has a molar concentration of solutes of 0.30 M.What is the osmotic pressure of blood at 25°C?

Calculate the molarity of a solution prepared by diluting 1.85 L of 6.5 M KOH to 11.0 L.

Colligative properties depend on

Calcium nitrite is used as a corrosion inhibitor in lubricants.What is the molality of a solution prepared by dissolving 18.5 g of calcium nitrite in 83.5 g of distilled water?

Two aqueous solutions are prepared: 2.0 m Cu(NO3)2 and 2.0 m NaBr.Which of the following statements is true?

Which of the following sets of conditions could exist when two liquids which are completely miscible in one another are mixed?

How many moles of solute particles are present in 100.0 mL of 2.50 M (NH4)3PO4?

Which of the following aqueous solutions will have the lowest osmotic pressure?

Keys to the Study of Chemistry

The Components of Matter

Stoichiometry of Formulas and Equations

Three Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids,solids,and Phase Changes

The Main-Group Elements: Applying Principles of Bonding and Structure

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Equilibrium: the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, free Energy, and the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

A 7.112 M solution of sulfuric acid (H₂SO₄)in water has a density of 1.395 g/mL.What is its molality?

Safrole is used as a topical antiseptic.Calculate the vapor pressure of a solution prepared by dissolving 0.75 mol of safrole in 950 g of ethanol ( = 46.07 g/mol).P°_ethanol = 50.0 torr at 25°C.

What is the molality of a solution prepared by dissolving 86.9 g of diethyl ether,C₄H₁₀O,in 425 g of benzene,C₆H₆?

Dimethylglyoxime,DMG,is an organic compound used to test for aqueous nickel(II)ions.A solution prepared by dissolving 65.0 g of DMG in 375 g of ethanol boils at 80.3°C.What is the molar mass of DMG? K_b = 1.22°C/m,boiling point of pure ethanol = 78.5°C

Two aqueous solutions are prepared: 1.00 m Na₂CO₃ and 1.00 m LiCl.Which of the following statements is true?

Cinnamaldehyde ( = 132.15 g/mol)is used as a flavoring agent.What mass of cinnamaldehyde must be added to 175 g of ethanol to give a solution whose boiling point is 82.7°C? K_b = 1.22°C/m,boiling point of pure ethanol = 78.5°C

Two aqueous solutions are prepared: 2.0 m Cu(NO₃)₂ and 2.0 m NaBr.Which of the following statements is true?

How many moles of solute particles are present in 100.0 mL of 2.50 M (NH₄)₃PO₄?