Unit 3 AP Chemistry MCQ

Which of the following gases is expected to behave least ideally at a given temperature and pressure?

• HCI

• NH₃

• Xe

• He

A sample gas is cooled from 70^O C to 35^O C Which statement correctly describes what happens to the volume?

• The volume increases by a factor of less than 2.

• The volume increases by a factor of 2.

• The volume decreases by a factor of less than 2.

• The volume decreases by a factor of 2.

Which of the following statements is true concerning real gases?

• The observed pressure will be less than the ideal pressure and the volume for the real gas particle sis more than thevolume of the ideal gas particles.

• The observed pressure will be less than the ideal pressure adn the volume for the real gas particle sis less than the volume of the ideal gas particles.

• Teh observed pressure will be more than the ideal pressure, and the volume for the real gas particles is less than teh volume fo the ideal gas particles.

• The observed pressure will be mroe than the ideal pressure, and the volume for the real gas particles is more than the volume of the ideal gas particles.

Nonpolar solutes dissolve more readily in nopolar solvents than in polar solvents.Describe the interaction occurring between teh nonpolar solute and the nonpolar solvent.

• The induced dipole of the solute molecule creates a permanent dipole in the solvent molecule.

• The induced dipole of the solute molecule attracts the induced dipole in the solvent molecule.

• The permanent dipole of the solute molecule attracts the induceddipole in the solvent molecule.

• The permanent dipole of the solute molecule creates a permanent dipole in the solvent and there is dipole to dipole attraction.

Which compound would be expected to be the most soluble in octane, C₈H₁₈?

• CH₃OCH₃
  
  

• CHBr₃
  
  

• CO₂
  
  

• CH₃NH₃
  
  

Tags

NGSS.HS-PS2-6

Two identical railroad tanker cars are evacuate dand then each is filled with 1.20x10³ moles of a gas at 27 degrees C. Tank car 1 is filled with sulfur dioxide while Tank car 2 is filled with carbon monoxide. Initally the pressures in the tanks are equal. During a train derailment, identical pin sized holes are made in each tank car; the decreasein pressure of each tank car is monitored. One of the tank cars has a much more rapid decrease in pressure than the other. Which statement best explains this?

• The pressure in tank car 1 decreases more reapidly because the heavier molecules of SO₂ have a greater velocity than that of CO molecules.

• The pressure in Tank Car 1 decreases more rapidly because there are more molecules of SO₂ than molecules of CO.

• The pressure in Tank Car 2 decreases more rapidly because CO molecules are lighter and have a higher velocity than SO₂ molecules.

• The pressure in Tank Car 2 decreases more rapidly because there are more molecules of CO than molecules of SO₂

Tags

NGSS.HS-PS2-1

Which of the following is the best explanation of how ions in KCI interact with a water molecule in the process of dissolution?

• The K ions are attracted to the oxygen end of the water molecule and the CI ions are attracted to the hydrogen end.

• The K ions are attracted to the hydrogen end of the water molecule and the CI ions are attracted to the oxygen end.

• Both the K⁺ and CI^-ions are attracted to the oxygen end of the water molecule.

• Both the K⁺ and CI^- ions are attracted to the hydrogen end of the water molecule.

Tags

NGSS.HS-PS2-4

The experimental apparatus represneted to the right is use dto demonstrate the rate at which gases diffuse. When the cotton balls coated in different gases are placed in the ends of a tube at the same time, the gases diffuse from each and meet somewhere in between, where they react. Which of the following combinations will produce a reaction closest to the cneter of the tube?

• HCI and NH₃

• HBR and C₂H⁶

• NH₃ and CH₄

• HBr and NH₃

Tags

NGSS.HS-PS1-5

A student is aksed to determine the identity of three different aqueaous solutions of equal molarity. The solutions are

Ca₁(C₂H₃O₂)₂ and K₃PO₄ in no particular order. The student uses a conductivity meter and tests the conductivity of equal volumes of each soltuion. The results are shown to the left. Which beaker contains K₃PO₄ ?

• Bearker 1

• Bearker 2

• Beaker 3

• Cannot be determined

Tags

NGSS.HS-PS2-5

The Maxwell Boltzmann distributions of molecular speeds in smaples of two different gases at the same termperature are shown. Which gas has the smaller molar mass?

• Gas A

• Gas B

• smaller Both gases have the same molar mass

• it cannot be determined unless the pressure of each sample is known.

Tags

NGSS.HS-PS2-1