Question 1

Electrolyte solutions generally behave less ideally as the solute concentration increases.

Accepted Answer

A) True 
 B)False

Question 2

Human blood has a molar concentration of solutes of 0.30 M. What is the osmotic pressure of blood at 25$\degree$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 3

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$\degree$ethanol = 50.0 torr at 25$\degree$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 4

The solubility of the oxidizing agent potassium permanganate is 7.1 g per 100.0 g of water at 25$\degree$C. What is the mole fraction of potassium permanganate in this solution?

Accepted Answer

A)  0.0080 
B)  0.0086 
C)  0.066 
D)  0.45 
E)  0.48 
A)  0.0080 
B)  0.0086 
C)  0.066 
D)  0.45 
E)  0.48

Question 5

If a 100-mL sample of a volatile liquid such as diethyl ether is introduced into a 250-mL flask which is immediately sealed, the pressure inside will increase above atmospheric pressure. Explain.

Accepted Answer

The pressure inside the flask will initi

Question 6

Classify the following as either solutions or colloids. If a colloid, name the type of colloid and identify both the dispersed and the dispersing phases.
a. glucose in water
b. smoke in air
c. carbon dioxide in air
d. milk

Accepted Answer

a. solution 
b. coll

Question 7

Copper(II) bromide is used as a wood preservative. What mass of CuBr2 is needed to prepare 750.0 mL of a 1.25 M solution?

Accepted Answer

A)  134 g 
B)  209 g 
C)  372 g 
D)  938 g 
E)  > 1 kg 
A)  134 g 
B)  209 g 
C)  372 g 
D)  938 g 
E)  > 1 kg

Question 8

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 osmotic pressure of the solution ins

Question 9

The shape of a protein molecule is determined completely by

Accepted Answer

A)  hydrogen bonding. 
B)  ion-dipole attractions. 
C)  dispersion forces. 
D)  disulfide bridges. 
E)  the sequence of amino acids in the chain. 
A)  hydrogen bonding. 
B)  ion-dipole attractions. 
C)  dispersion forces. 
D)  disulfide bridges. 
E)  the sequence of amino acids in the chain.

Question 10

Which of the following aqueous solutions should demonstrate the most non-ideal behavior?

Accepted Answer

A)  0.1 M NaI 
B)  0.2 M CuSO4 
C)  0.5 M KBr 
D)  2.0 M CuCl2 
E)  2.0 M CsCl 
A)  0.1 M NaI 
B)  0.2 M CuSO4 
C)  0.5 M KBr 
D)  2.0 M CuCl2 
E)  2.0 M CsCl

Question 11

Under physiological conditions, amino acids in solution carry

Accepted Answer

A)  no electrical charges. 
B)  a net positive charge, due to an -NH3+ group or groups. 
C)  a net negative charge, due to a -COO¯ group or groups. 
D)  both -NH2 and -COOH groups. 
E)  both -NH3+ and -COO¯ groups. 
A)  no electrical charges. 
B)  a net positive charge, due to an -NH3+ group or groups. 
C)  a net negative charge, due to a -COO¯ group or groups. 
D)  both -NH2 and -COOH groups. 
E)  both -NH3+ and -COO¯ groups.

Question 12

Which of the following aqueous solutions should demonstrate the most ideal behavior?

Accepted Answer

A)  0.1 M K2SO4 
B)  0.1 M CaCl2 
C)  3.0 M LiF 
D)  0.1 M MgSO4 
E)  0.1 M NaCl 
A)  0.1 M K2SO4 
B)  0.1 M CaCl2 
C)  3.0 M LiF 
D)  0.1 M MgSO4 
E)  0.1 M NaCl

Question 13

The mole fraction of potassium nitrate in an aqueous solution is 0.0194. The solution's density is 1.0627 g/mL. Calculate the molarity of the solution.

Accepted Answer

A)  0.0194 M 
B)  0.981 M 
C)  1.05 M 
D)  1.96 M 
E)  19.4 M 
A)  0.0194 M 
B)  0.981 M 
C)  1.05 M 
D)  1.96 M 
E)  19.4 M

Question 14

Cadmium bromide is used in photography and lithography. Calculate the molality of a solution prepared by dissolving 45.38 g of CdBr2 in 375.0 g of water.

Accepted Answer

A)  0.03035 m 
B)  0.01600 m 
C)  0.1210 m 
D)  0.4446 m 
E)  None of these choices is correct. 
A)  0.03035 m 
B)  0.01600 m 
C)  0.1210 m 
D)  0.4446 m 
E)  None of these choices is correct.

Question 15

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$\degree$C? Kb = 1.22$\degree$C/m, boiling point of pure ethanol = 78.5$\degree$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 16

Two aqueous 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 choices is correct. 
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 choices is correct.

Question 17

Carbon tetrachloride, once widely used in fire extinguishers and as a dry cleaning fluid, has been found to cause liver damage to those exposed to its vapors over long periods of time. What is the boiling point of a solution prepared by dissolving 375 g of sulfur (S8, ? = 256.5 g/mol) in 1250 g of CCl4? Kb = 5.05$\degree$C/m, boiling point of pure CCl4 = 76.7$\degree$C

Accepted Answer

A)  70.8$\degree$C 
B)  75.2$\degree$C 
C)  78.2$\degree$C 
D)  82.6$\degree$C 
E)  >85$\degree$C 
A)  70.8$\degree$C 
B)  75.2$\degree$C 
C)  78.2$\degree$C 
D)  82.6$\degree$C 
E)  >85$\degree$C

Question 18

A solution of sucrose (sugar) in water is in equilibrium with solid sucrose. If more solid sucrose is now added, with stirring,

Accepted Answer

A)  the concentration of the solution will increase. 
B)  the concentration of the solution will decrease. 
C)  the concentration of the solution will remain the same. 
D)  the volume of solution will increase. 
E)  a supersaturated solution will be produced. 
A)  the concentration of the solution will increase. 
B)  the concentration of the solution will decrease. 
C)  the concentration of the solution will remain the same. 
D)  the volume of solution will increase. 
E)  a supersaturated solution will be produced.

Exam 13: The Properties of Mixtures: Solutions and Colloids

Electrolyte solutions generally behave less ideally as the solute concentration increases.

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

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 °\degree° ethanol = 50.0 torr at 25 °\degree° C.

The solubility of the oxidizing agent potassium permanganate is 7.1 g per 100.0 g of water at 25 °\degree° C. What is the mole fraction of potassium permanganate in this solution?

If a 100-mL sample of a volatile liquid such as diethyl ether is introduced into a 250-mL flask which is immediately sealed, the pressure inside will increase above atmospheric pressure. Explain.

Classify the following as either solutions or colloids. If a colloid, name the type of colloid and identify both the dispersed and the dispersing phases. a. glucose in water b. smoke in air c. carbon dioxide in air d. milk

Copper(II) bromide is used as a wood preservative. What mass of CuBr2 is needed to prepare 750.0 mL of a 1.25 M solution?

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.

The shape of a protein molecule is determined completely by

Which of the following aqueous solutions should demonstrate the most non-ideal behavior?

Under physiological conditions, amino acids in solution carry

Which of the following aqueous solutions should demonstrate the most ideal behavior?

The mole fraction of potassium nitrate in an aqueous solution is 0.0194. The solution's density is 1.0627 g/mL. Calculate the molarity of the solution.

Cadmium bromide is used in photography and lithography. Calculate the molality of a solution prepared by dissolving 45.38 g of CdBr2 in 375.0 g of water.

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 °\degree° C? Kb = 1.22 °\degree° C/m, boiling point of pure ethanol = 78.5 °\degree° C

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

A solution of sucrose (sugar) in water is in equilibrium with solid sucrose. If more solid sucrose is now added, with stirring,

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

Periodic Patterns in the Main-Group Elements

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 Elements in Nature and Industry

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

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

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 $\degree$ _ethanol = 50.0 torr at 25 $\degree$ C.

The solubility of the oxidizing agent potassium permanganate is 7.1 g per 100.0 g of water at 25 $\degree$ C. What is the mole fraction of potassium permanganate in this solution?

Copper(II) bromide is used as a wood preservative. What mass of CuBr₂ is needed to prepare 750.0 mL of a 1.25 M solution?

Cadmium bromide is used in photography and lithography. Calculate the molality of a solution prepared by dissolving 45.38 g of CdBr₂ in 375.0 g of water.

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 $\degree$ C? K_b = 1.22 $\degree$ C/m, boiling point of pure ethanol = 78.5 $\degree$ C

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