Question 1

Barbiturates are synthetic drugs used as sedatives and hypnotics. Barbital (? = 184.2 g/mol)  is one of the simplest of these drugs. What is the boiling point of a solution prepared by dissolving 42.5 g of barbital in 825 g of acetic acid? Kb = 3.07 °\degree° C/m; boiling point of pure acetic acid = 117.9 °\degree° C

Accepted Answer

A)   117.0 °\degree° C
B)   117.7 °\degree° C
C)   118.1 °\degree° C
D)   118.8 °\degree° C
E)   >120 °\degree° C F) B) and C)
G) B) and D)

Question 2

Children under the age of six with more than 0.10 ppm of lead in their blood can suffer a reduction in I.Q. or have behavior problems. What is the molality of a solution which contains 0.10 ppm of lead?

Accepted Answer

A)   4.8 *10¯10 m
B)   4.8*10¯7 m
C)   4.8 *10¯4 m
D)   4.8 *10¯1 m
E)   None of these choices is correct.F) A) and B)
G) A) and C)

Question 3

A 2.0% (w/v)  solution of sodium hydrogen citrate, Na2C6H6O7, which also contains 2.5% (w/v)  of dextrose, C6H12O6, is used as an anticoagulant for blood which is to be used for transfusions. What is the molarity of the sodium hydrogen citrate in the solution?

Accepted Answer

A)   0.085 M
B)   0.19 M
C)   0.53 M
D)   1.2 M
E)   1.3 MF) B) and C)
G) A) and B)

Question 4

A solution of ethanol (C2H6O)  in water is sometimes used as a disinfectant. 1.00 L of this solution contains 553 g of ethanol and 335 g of water. What is the mole fraction of ethanol in this solution?

Accepted Answer

A)   0.377
B)   0.392
C)   0.553
D)   0.608
E)   0.623F) A) and E)
G) A) and B)

Question 5

Isoamyl salicylate (м = 208.25 g/mol)  has a pleasant aroma and is used in perfumes and soaps. Which of the following combinations gives a 0.75 m solution of isoamyl salicylate in ethyl alcohol (d = 0.7893 g/mL) ?

Accepted Answer

A)   117.2 g isoamyl salicylate in 950.0 mL of ethyl alcohol
B)   117.2 g isoamyl salicylate in 750.0 mL of ethyl alcohol
C)   117.2 g isoamyl salicylate in 750.0 mL of solution
D)   117.2 g isoamyl salicylate in 592.0 g of ethyl alcohol
E)   None of these choices is correct.F) A) and E)
G) B) and E)

Question 6

How many moles of sulfate ions are present in 1.0 L of 0.5 M Li2SO4?

Accepted Answer

A)   0.5 mol
B)   1.0 mol
C)   1.5 mol
D)   2.0 mol
E)   3.0 molF) A) and E)
G) A) and C)

Question 7

Consider the expression below, showing the terms which contribute to the heat of solution, ∆Hsoln: ∆Hsoln = ∆Hsolute + ∆Hsolvent + ∆Hmix
Which of the following sets correctly shows the signs (positive or negative)  of the three terms on the right hand side of the equation?

Accepted Answer

A)   ∆Hsolute > 0; ∆Hsolvent > 0; ∆Hmix > 0
B)   ∆Hsolute solvent mix 
C)   ∆Hsolute > 0; ∆Hsolvent > 0; ∆Hmix 
D)   ∆Hsolute solvent mix > 0
E)   ∆Hsolute solvent > 0; ∆Hmix < 0F) C) and D)
G) A) and C)

Question 8

A 0.100 m MgSO4 solution has a freezing point of -0.23 °\degree° C. What is the van't Hoff factor for this solution? Kf = 1.86 °\degree° C/m

Accepted Answer

A)   0.62
B)   1.0
C)   1.2
D)   2.0
E)   4.0 F) A) and D)
G) A) and B)

Question 9

How many moles of bromide ions are present in 750.0 mL of 1.35 M MgBr2?

Accepted Answer

A)   0.506 mol
B)   1.01 mol
C)   2.03 mol
D)   3.04 mol
E)   None of these choices is correct.F) B) and C)
G) All of the above

Question 10

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 11

Gases with high boiling points tend to be more soluble in water than ones with low boiling points.

Accepted Answer

A) True 
 B)False

Question 12

Select the type of interaction which best describes the attraction between Mg2+ ions and water molecules.

Accepted Answer

A)   dipole-dipole
B)   dipole-induced dipole
C)   ion-dipole
D)   ion-induced dipole
E)   ion-hydrogen bondF) A) and B)
G) A) and C)

Question 13

A saturated solution of carbon dioxide in water contains 3.00 g of CO2 when the CO2 partial pressure is 8.0 atm. What mass of CO2 will escape if the partial pressure is lowered to 3.2 atm?

Accepted Answer

A)   0.90 g
B)   1.20 g
C)   1.40 g
D)   1.80 g
E)   2.20 gF) A) and E)
G) C) and E)

Question 14

The concentration of iodine in sea water is 60. parts per billion by mass. If one assumes that the iodine exists in the form of iodide anions, what is the molarity of iodide in sea water? (The density of sea water is 1.025 g/mL.)

Accepted Answer

A)   4.8 *10¯13 M
B)   4.8 *10¯10 M
C)   4.8*10¯7 M
D)   4.7 * 10¯4 M
E)   4.7 *10¯1 MF) B) and E)
G) All of the above

Question 15

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 MF) D) and E)
G) A) and E)

Question 16

The solubility of gases in water increases with increase in the pressure of the gas.

Accepted Answer

A) True 
 B)False

Question 17

List five important intermolecular forces that operate in globular proteins, and explain what parts of the molecule are involved in these forces.

Accepted Answer

1. Ion-dipole forces. These exist betwee...

Question 18

All solutions are mixtures.

Accepted Answer

A) True 
 B)False

Question 19

What volume of concentrated (14.7 M)  phosphoric acid is needed to prepare 25.0 L of 3.0 M H3PO4?

Accepted Answer

A)   0.20 L
B)   0.57 L
C)   1.8 L
D)   3.6 L
E)   5.1 LF) B) and C)
G) A) and E)

Question 20

A solution of ethanol (C2H6O)  in water is sometimes used as a disinfectant. 1.00 L of this solution contains 553 g of ethanol and 335 g of water. What is the molality of the ethanol in this solution?

Accepted Answer

A)   0.392 m
B)   0.608 m
C)   13.5 m
D)   33.6 m
E)   35.8 mF) C) and D)
G) A) and B)

Exam 13: The Properties of Mixtures: Solutions and Colloids

Isoamyl salicylate (м = 208.25 g/mol) has a pleasant aroma and is used in perfumes and soaps. Which of the following combinations gives a 0.75 m solution of isoamyl salicylate in ethyl alcohol (d = 0.7893 g/mL) ?

Correct Answer
verified

A 2.0% (w/v) solution of sodium hydrogen citrate, Na₂C₆H₆O₇, which also contains 2.5% (w/v) of dextrose, C₆H₁₂O₆, is used as an anticoagulant for blood which is to be used for transfusions. What is the molarity of the sodium hydrogen citrate in the solution?

Correct Answer
verified

How many moles of bromide ions are present in 750.0 mL of 1.35 M MgBr₂?

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

All solutions are mixtures.

Correct Answer
verified

What volume of concentrated (14.7 M) phosphoric acid is needed to prepare 25.0 L of 3.0 M H₃PO₄?

Correct Answer
verified

The concentration of iodine in sea water is 60. parts per billion by mass. If one assumes that the iodine exists in the form of iodide anions, what is the molarity of iodide in sea water? (The density of sea water is 1.025 g/mL.)

Correct Answer
verified

Children under the age of six with more than 0.10 ppm of lead in their blood can suffer a reduction in I.Q. or have behavior problems. What is the molality of a solution which contains 0.10 ppm of lead?

Correct Answer
verified

A solution of ethanol (C₂H₆O) in water is sometimes used as a disinfectant. 1.00 L of this solution contains 553 g of ethanol and 335 g of water. What is the molality of the ethanol in this solution?

Correct Answer
verified

List five important intermolecular forces that operate in globular proteins, and explain what parts of the molecule are involved in these forces.

Correct Answer
verified
1. Ion-dipole forces. These exist betwee...
View Answer

A solution of ethanol (C₂H₆O) in water is sometimes used as a disinfectant. 1.00 L of this solution contains 553 g of ethanol and 335 g of water. What is the mole fraction of ethanol in this solution?

Correct Answer
verified

Select the type of interaction which best describes the attraction between Mg²⁺ ions and water molecules.

Correct Answer
verified

A saturated solution of carbon dioxide in water contains 3.00 g of CO₂ when the CO₂ partial pressure is 8.0 atm. What mass of CO₂ will escape if the partial pressure is lowered to 3.2 atm?

Correct Answer
verified

How many moles of sulfate ions are present in 1.0 L of 0.5 M Li₂SO₄?

Correct Answer
verified

The solubility of gases in water increases with increase in the pressure of the gas.

Correct Answer
verified

Gases with high boiling points tend to be more soluble in water than ones with low boiling points.

Correct Answer
verified

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

Correct Answer
verified

A 0.100 m MgSO₄ solution has a freezing point of -0.23 $\degree$ C. What is the van't Hoff factor for this solution? K_f = 1.86 $\degree$ C/m

Correct Answer
verified

Consider the expression below, showing the terms which contribute to the heat of solution, ∆H_soln: ∆H_soln = ∆H_solute + ∆H_solvent + ∆H_mix Which of the following sets correctly shows the signs (positive or negative) of the three terms on the right hand side of the equation?

Correct Answer
verified

Exam 13: The Properties of Mixtures: Solutions and Colloids

Isoamyl salicylate (м = 208.25 g/mol) has a pleasant aroma and is used in perfumes and soaps. Which of the following combinations gives a 0.75 m solution of isoamyl salicylate in ethyl alcohol (d = 0.7893 g/mL) ?

Correct AnswerverifiedShow Answer

A 2.0% (w/v) solution of sodium hydrogen citrate, Na2C6H6O7, which also contains 2.5% (w/v) of dextrose, C6H12O6, is used as an anticoagulant for blood which is to be used for transfusions. What is the molarity of the sodium hydrogen citrate in the solution?

Correct AnswerverifiedShow Answer

How many moles of bromide ions are present in 750.0 mL of 1.35 M MgBr2?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

All solutions are mixtures.

Correct AnswerverifiedShow Answer

What volume of concentrated (14.7 M) phosphoric acid is needed to prepare 25.0 L of 3.0 M H3PO4?

Correct AnswerverifiedShow Answer

The concentration of iodine in sea water is 60. parts per billion by mass. If one assumes that the iodine exists in the form of iodide anions, what is the molarity of iodide in sea water? (The density of sea water is 1.025 g/mL.)

Correct AnswerverifiedShow Answer

Children under the age of six with more than 0.10 ppm of lead in their blood can suffer a reduction in I.Q. or have behavior problems. What is the molality of a solution which contains 0.10 ppm of lead?

Correct AnswerverifiedShow Answer

A solution of ethanol (C2H6O) in water is sometimes used as a disinfectant. 1.00 L of this solution contains 553 g of ethanol and 335 g of water. What is the molality of the ethanol in this solution?

Correct AnswerverifiedShow Answer

List five important intermolecular forces that operate in globular proteins, and explain what parts of the molecule are involved in these forces.

Correct Answerverified1. Ion-dipole forces. These exist betwee...View AnswerShow Answer

A solution of ethanol (C2H6O) in water is sometimes used as a disinfectant. 1.00 L of this solution contains 553 g of ethanol and 335 g of water. What is the mole fraction of ethanol in this solution?

Correct AnswerverifiedShow Answer

Select the type of interaction which best describes the attraction between Mg2+ ions and water molecules.

Correct AnswerverifiedShow Answer

A saturated solution of carbon dioxide in water contains 3.00 g of CO2 when the CO2 partial pressure is 8.0 atm. What mass of CO2 will escape if the partial pressure is lowered to 3.2 atm?

Correct AnswerverifiedShow Answer

How many moles of sulfate ions are present in 1.0 L of 0.5 M Li2SO4?

Correct AnswerverifiedShow Answer

The solubility of gases in water increases with increase in the pressure of the gas.

Correct AnswerverifiedShow Answer

Gases with high boiling points tend to be more soluble in water than ones with low boiling points.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A 0.100 m MgSO4 solution has a freezing point of -0.23 °\degree° C. What is the van't Hoff factor for this solution? Kf = 1.86 °\degree° C/m

Correct AnswerverifiedShow Answer

Consider the expression below, showing the terms which contribute to the heat of solution, ∆Hsoln: ∆Hsoln = ∆Hsolute + ∆Hsolvent + ∆Hmix Which of the following sets correctly shows the signs (positive or negative) of the three terms on the right hand side of the equation?

Correct AnswerverifiedShow Answer

Correct Answer
verified

A 2.0% (w/v) solution of sodium hydrogen citrate, Na₂C₆H₆O₇, which also contains 2.5% (w/v) of dextrose, C₆H₁₂O₆, is used as an anticoagulant for blood which is to be used for transfusions. What is the molarity of the sodium hydrogen citrate in the solution?

Correct Answer
verified

How many moles of bromide ions are present in 750.0 mL of 1.35 M MgBr₂?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

What volume of concentrated (14.7 M) phosphoric acid is needed to prepare 25.0 L of 3.0 M H₃PO₄?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A solution of ethanol (C₂H₆O) in water is sometimes used as a disinfectant. 1.00 L of this solution contains 553 g of ethanol and 335 g of water. What is the molality of the ethanol in this solution?

Correct Answer
verified

Correct Answer
verified
1. Ion-dipole forces. These exist betwee...
View Answer

A solution of ethanol (C₂H₆O) in water is sometimes used as a disinfectant. 1.00 L of this solution contains 553 g of ethanol and 335 g of water. What is the mole fraction of ethanol in this solution?

Correct Answer
verified

Select the type of interaction which best describes the attraction between Mg²⁺ ions and water molecules.

Correct Answer
verified

A saturated solution of carbon dioxide in water contains 3.00 g of CO₂ when the CO₂ partial pressure is 8.0 atm. What mass of CO₂ will escape if the partial pressure is lowered to 3.2 atm?

Correct Answer
verified

How many moles of sulfate ions are present in 1.0 L of 0.5 M Li₂SO₄?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A 0.100 m MgSO₄ solution has a freezing point of -0.23 $\degree$ C. What is the van't Hoff factor for this solution? K_f = 1.86 $\degree$ C/m

Correct Answer
verified

Consider the expression below, showing the terms which contribute to the heat of solution, ∆H_soln: ∆H_soln = ∆H_solute + ∆H_solvent + ∆H_mix Which of the following sets correctly shows the signs (positive or negative) of the three terms on the right hand side of the equation?

Correct Answer
verified