Exam 13: Mixtures at the Molecular Level: Properties of Solutions

The solubility of O₂ in water is approximately 0.00380 g L^-1 of water when the temperature is 25.0°C and the partial pressure of gaseous oxygen is 760 torr. The oxygen gas above the water is replaced by air at the same temperature and pressure, in which the mole fraction of oxygen is 0.210. What will the solubility of oxygen in water be under these new conditions?

(Multiple Choice)

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Question 41

What properties does a molecule need to form a micelle?

(Short Answer)

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Question 42

An aqueous solution of glycerol, C₃H₈O₃, is 48.0% glycerol by mass andhas a density of 1.120 g mL^-1. Calculate the molarity of the glycerol solution.

(Multiple Choice)

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Question 43

A solution of ethylene glycol (C₂H₆O₂)in water is 3.981 molar and has a density of Calculate the percent, by weight, of ethylene glycol in the solution.

(Multiple Choice)

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Question 44

An aqueous solution that would cause red blood cells to shrink from increased osmotic pressure is called a(n)________ solution.

(Multiple Choice)

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Question 45

If the concentration of hydrogen gas in a liquid sample at 1.25 atm and 25°C is 9.75 × 10⁻⁴ M, the concentration of hydrogen gas at 3.41 atm and 25°C would be ________.

(Short Answer)

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Question 46

All substances can be either hydrophobic or hydrophilic, but not both.

(True/False)

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Question 47

An aqueous solution of glycerol, C₃H₈O₃, is 48.0% glycerol by mass and has a density of Calculate the molality of the glycerol solution.

(Multiple Choice)

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Question 48

Pure cyclohexane, C₆H₁₂, has a freezing point of 6.53°C. Its freezing point depression constant is: K_f = 20.0 °C m^-1. A solution was made by taking 11.40 g of an unknown nonelectrolyte and dissolving it in 150.0 g of cyclohexane. The measured freezing point of the solution was -0.78°C. Calculate the molecular weight of the unknown substance.Hint: Find molality, then moles, then molar mass, being sure to keep track of units.

(Multiple Choice)

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Question 49

Which is a concentration unit whose value changes if the temperature of an aqueous solution is changed?

(Multiple Choice)

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Question 50

What is the freezing point of an aqueous solution of a nonvolatile solute that has a boiling point of 102.45 °C? K_f = 1.86 °C m⁻¹ and K_b = 0.512 °C m⁻¹.

(Short Answer)

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Question 51

Which aqueous solution has the highest boiling point?

(Multiple Choice)

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Question 52

A solution contains 221 g of glycerol (C₃H₈O₃)in 600 grams of water. For the solvent, the K_f is 1.86 °C m^-1 and K_b is 0.512 °C m^-1. What should the boiling point of the solution be?

(Multiple Choice)

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Question 53

A very dilute solution contains 116 mg of fructose (molar mass = 180.16 g mol^-1)in 1.000 liter of solution. It is placed in an osmotic membrane bladder, which is then suspended in pure water. What osmotic pressure would develop across the membrane if the temperature is 26.0°C?

(Multiple Choice)

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Question 54

Hydrophobic substances mix easily with water.

(True/False)

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Question 55

The solubility of CO₂ gas in water would ________ if the partial pressure of CO₂ was increased.

(Short Answer)

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Question 56

A solution, which was made by dissolving 62.07 g of a nonelectrolyte in 500 g of water, exhibits a freezing point of -1.86°C. What is the molecular weight of this nonelectrolyte compound? For water, K_f is 1.86°C m^-1 and K_b is 0.512°C m^-1.

(Multiple Choice)

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Question 57

An aqueous solution of ethanol, C₂H₅OH is prepared by adding 200. g of ethanol to 50.0 g of water. What is the mole fraction of ethanol in the final solution?

(Multiple Choice)

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Question 58

The solubility of oxygen in lakes high in mountains is affected by the altitude. If the solubility of O₂ from the air is 2.67 × 10⁻⁴ M at sea level when the pressure is 1.000 atm and the temperature is 25°C, what is the solubility of O₂ at an elevation of 12,000 ft. where the atmospheric pressure is 0.643 atm? Assume the temperature is 25°C, and that the mole fraction of O₂ in air is 0.211 at both 12,000 ft. and at sea level.

(Short Answer)

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Question 59

Colligative properties depend primarily on the concentration of solute particles in the solution.

(True/False)

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Question 60

Showing 41 - 60 of 133

What properties does a molecule need to form a micelle?

An aqueous solution of glycerol, C₃H₈O₃, is 48.0% glycerol by mass andhas a density of 1.120 g mL^-1. Calculate the molarity of the glycerol solution.

A solution of ethylene glycol (C₂H₆O₂)in water is 3.981 molar and has a density of Calculate the percent, by weight, of ethylene glycol in the solution.

An aqueous solution that would cause red blood cells to shrink from increased osmotic pressure is called a(n)________ solution.

If the concentration of hydrogen gas in a liquid sample at 1.25 atm and 25°C is 9.75 × 10⁻⁴ M, the concentration of hydrogen gas at 3.41 atm and 25°C would be ________.

All substances can be either hydrophobic or hydrophilic, but not both.

An aqueous solution of glycerol, C₃H₈O₃, is 48.0% glycerol by mass and has a density of Calculate the molality of the glycerol solution.

Which is a concentration unit whose value changes if the temperature of an aqueous solution is changed?

What is the freezing point of an aqueous solution of a nonvolatile solute that has a boiling point of 102.45 °C? K_f = 1.86 °C m⁻¹ and K_b = 0.512 °C m⁻¹.

Which aqueous solution has the highest boiling point?

A solution contains 221 g of glycerol (C₃H₈O₃)in 600 grams of water. For the solvent, the K_f is 1.86 °C m^-1 and K_b is 0.512 °C m^-1. What should the boiling point of the solution be?

A very dilute solution contains 116 mg of fructose (molar mass = 180.16 g mol^-1)in 1.000 liter of solution. It is placed in an osmotic membrane bladder, which is then suspended in pure water. What osmotic pressure would develop across the membrane if the temperature is 26.0°C?

Hydrophobic substances mix easily with water.

The solubility of CO₂ gas in water would ________ if the partial pressure of CO₂ was increased.

A solution, which was made by dissolving 62.07 g of a nonelectrolyte in 500 g of water, exhibits a freezing point of -1.86°C. What is the molecular weight of this nonelectrolyte compound? For water, K_f is 1.86°C m^-1 and K_b is 0.512°C m^-1.

An aqueous solution of ethanol, C₂H₅OH is prepared by adding 200. g of ethanol to 50.0 g of water. What is the mole fraction of ethanol in the final solution?

Colligative properties depend primarily on the concentration of solute particles in the solution.

A Very Brief History of Chemistry

Scientific Measurements

Elements, Compounds, and the Periodic Table

The Mole and Stoichiometry

Molecular View of Reactions in Aqueous Solutions

Oxidation-Reduction Reactions

Energy and Chemical Change

The Quantum Mechanical Atom

The Basics of Chemical Bonding

Theories of Bonding and Structure

Properties of Gases

Intermolecular Attractions and the Properties of Liquids and Solids

Chemical Kinetics

Chemical Equilibrium

Acids and Bases, a Molecular Look

Acid-Base Equilibria in Aqueous Solutions

Solubility and Simultaneous Equilibria

Thermodynamics

Electrochemistry

Nuclear Reactions and Their Role in Chemistry

Metal Complexes

Organic Compounds, Polymers, and Biochemicals

Filters

Exam 13: Mixtures at the Molecular Level: Properties of Solutions

What properties does a molecule need to form a micelle?

An aqueous solution of glycerol, C3H8O3, is 48.0% glycerol by mass andhas a density of 1.120 g mL-1. Calculate the molarity of the glycerol solution.

A solution of ethylene glycol (C2H6O2)in water is 3.981 molar and has a density of Calculate the percent, by weight, of ethylene glycol in the solution.

An aqueous solution that would cause red blood cells to shrink from increased osmotic pressure is called a(n)________ solution.

If the concentration of hydrogen gas in a liquid sample at 1.25 atm and 25°C is 9.75 × 10−4 M, the concentration of hydrogen gas at 3.41 atm and 25°C would be ________.

All substances can be either hydrophobic or hydrophilic, but not both.

An aqueous solution of glycerol, C3H8O3, is 48.0% glycerol by mass and has a density of Calculate the molality of the glycerol solution.

Which is a concentration unit whose value changes if the temperature of an aqueous solution is changed?

What is the freezing point of an aqueous solution of a nonvolatile solute that has a boiling point of 102.45 °C? Kf = 1.86 °C m−1 and Kb = 0.512 °C m−1.

Which aqueous solution has the highest boiling point?

A solution contains 221 g of glycerol (C3H8O3)in 600 grams of water. For the solvent, the Kf is 1.86 °C m-1 and Kb is 0.512 °C m-1. What should the boiling point of the solution be?

A very dilute solution contains 116 mg of fructose (molar mass = 180.16 g mol-1)in 1.000 liter of solution. It is placed in an osmotic membrane bladder, which is then suspended in pure water. What osmotic pressure would develop across the membrane if the temperature is 26.0°C?

Hydrophobic substances mix easily with water.

The solubility of CO2 gas in water would ________ if the partial pressure of CO2 was increased.

A solution, which was made by dissolving 62.07 g of a nonelectrolyte in 500 g of water, exhibits a freezing point of -1.86°C. What is the molecular weight of this nonelectrolyte compound? For water, Kf is 1.86°C m-1 and Kb is 0.512°C m-1.

An aqueous solution of ethanol, C2H5OH is prepared by adding 200. g of ethanol to 50.0 g of water. What is the mole fraction of ethanol in the final solution?

Colligative properties depend primarily on the concentration of solute particles in the solution.

A Very Brief History of Chemistry

Scientific Measurements

Elements, Compounds, and the Periodic Table

The Mole and Stoichiometry

Molecular View of Reactions in Aqueous Solutions

Oxidation-Reduction Reactions

Energy and Chemical Change

The Quantum Mechanical Atom

The Basics of Chemical Bonding

Theories of Bonding and Structure

Properties of Gases

Intermolecular Attractions and the Properties of Liquids and Solids

Chemical Kinetics

Chemical Equilibrium

Acids and Bases, a Molecular Look

Acid-Base Equilibria in Aqueous Solutions

Solubility and Simultaneous Equilibria

Thermodynamics

Electrochemistry

Nuclear Reactions and Their Role in Chemistry

Metal Complexes

Organic Compounds, Polymers, and Biochemicals

Filters

An aqueous solution of glycerol, C₃H₈O₃, is 48.0% glycerol by mass andhas a density of 1.120 g mL^-1. Calculate the molarity of the glycerol solution.

A solution of ethylene glycol (C₂H₆O₂)in water is 3.981 molar and has a density of Calculate the percent, by weight, of ethylene glycol in the solution.

If the concentration of hydrogen gas in a liquid sample at 1.25 atm and 25°C is 9.75 × 10⁻⁴ M, the concentration of hydrogen gas at 3.41 atm and 25°C would be ________.

An aqueous solution of glycerol, C₃H₈O₃, is 48.0% glycerol by mass and has a density of Calculate the molality of the glycerol solution.

What is the freezing point of an aqueous solution of a nonvolatile solute that has a boiling point of 102.45 °C? K_f = 1.86 °C m⁻¹ and K_b = 0.512 °C m⁻¹.

A solution contains 221 g of glycerol (C₃H₈O₃)in 600 grams of water. For the solvent, the K_f is 1.86 °C m^-1 and K_b is 0.512 °C m^-1. What should the boiling point of the solution be?

A very dilute solution contains 116 mg of fructose (molar mass = 180.16 g mol^-1)in 1.000 liter of solution. It is placed in an osmotic membrane bladder, which is then suspended in pure water. What osmotic pressure would develop across the membrane if the temperature is 26.0°C?

The solubility of CO₂ gas in water would ________ if the partial pressure of CO₂ was increased.

A solution, which was made by dissolving 62.07 g of a nonelectrolyte in 500 g of water, exhibits a freezing point of -1.86°C. What is the molecular weight of this nonelectrolyte compound? For water, K_f is 1.86°C m^-1 and K_b is 0.512°C m^-1.

An aqueous solution of ethanol, C₂H₅OH is prepared by adding 200. g of ethanol to 50.0 g of water. What is the mole fraction of ethanol in the final solution?