Ali Kane
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SAT MCAT Test sobre MCAT Chemistry - Chemical Solutions, creado por Ali Kane el 21/05/2014.

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MCAT Chemistry - Chemical Solutions

Pregunta 1 de 10

1

What happens to the osmotic pressure of a solution when a different solute is added?

Selecciona una de las siguientes respuestas posibles:

  • Decreases

  • First decreases, then increases

  • Increases

  • None

Explicación

Pregunta 2 de 10

1

What is the osmotic pressure of a 0.01 M solution of NaCl at 305 K?

Selecciona una de las siguientes respuestas posibles:

  • 190 mmHg

  • 380 mmHg

  • 0.25 atm

  • 25 kPa

Explicación

Pregunta 3 de 10

1

What is the molar mass of a nonelectrolyte solute that causes an osmotic pressure of 15 torr at 25 oC when 0.1 g of the unknown are dissolved in water to form a total volume of 125 mL?

Selecciona una de las siguientes respuestas posibles:

  • 991 g / mol

  • 91 g / mol

  • 2500 g / mol

  • None of the above

Explicación

Pregunta 4 de 10

1

A careless experimenter placed a permeable membrane that allows the flow of both solute and solvent molecules through the membrane in the osmotic pressure measuring setup? Which of the following would be the result of his experiment?

Selecciona una de las siguientes respuestas posibles:

  • The solution level would be higher than the solvent level.

  • The solvent level would be higher than the solution level.

  • The two levels would remain the same because both solute and solvent can flow through the membrane.

  • None of the above

Explicación

Pregunta 5 de 10

1

Which of the following best explains a lower than expected boiling point?

Selecciona una de las siguientes respuestas posibles:

  • Vapor pressure lowering

  • Freezing point depression

  • The use of a volatile solute.

  • None of the above

Explicación

Pregunta 6 de 10

1

Which of the following would explain a higher than expected boiling point elevation?

Selecciona una de las siguientes respuestas posibles:

  • The thermometer is incorrect.

  • The solute is an electrolyte.

  • The solution is a nonelectrolyte.

  • The solution is very viscous.

Explicación

Pregunta 7 de 10

1

What is the boiling point of a 1.2 m aqueous solution of a nonelectrolyte? The Kb of water is 0.51 oC kg / mol.

Selecciona una de las siguientes respuestas posibles:

  • 100.6 degrees C

  • 99.4 degress C

  • 0.612 degrees C

  • None

Explicación

Pregunta 8 de 10

1

Which colligative property predicts the boiling point elevation phenomenon?

Selecciona una de las siguientes respuestas posibles:

  • Osmotic pressure

  • Freezing point depression

  • Viscosity elevation

  • Vapor pressure lowering

Explicación

Pregunta 9 de 10

1

Which of the following is not true about freezing points?

Selecciona una de las siguientes respuestas posibles:

  • They are a property only of the pure solvent and, therefore, cannot be changed.

  • They can be increased by the addition of a non-volatile solute.

  • They can be decreased by the addition of a non-volatile solute.

  • The can be increased by the addition of a volatile solute.

Explicación

Pregunta 10 de 10

1

How can we rationalize a situation where the vapor pressure of a solution is greater than that of the pure solvent despite Raoult's law that predicts a lower vapor pressure?

Selecciona una de las siguientes respuestas posibles:

  • We forgot to include Herny's law in our analysis.

  • Entropy dictates that there is a random chance of violating any law.

  • Experimental error

  • Raoult's law is only valid for nonvolatile solutes, the solute must be a volatile one.

Explicación

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