Quiz simul pre Ch vacation

The vapor pressure of a solution containing a nonvolatile solute is directly proportional to the

• molality of the solvent.

• osmotic pressure of the solute

• molarity of the solvent

• mole fraction of solvent

• mole fraction of solute

Which statement is false?

• The compression factor Z for a given gas approaches 1 at

  high pressure

• The average kinetic energy of a gas sample is only dependent on T

• Gases diffuse into each other and mix almost immediately when put into the same container

• The molecular weight of a gaseous compound is a non-variable quantity

• Pressure must be exerted on a sample of a gas in order to confine it

The diagram reports:

• The hybridization of H to 1s and 1s*

• The formation of H₂ molecular orbitals from H atomic orbitals

• The formation of H₂ unstable isotope

• The valence bond representation of H₂ formation

• none of these

Which molecule has a planar arrangement of all component atoms?

• CH₄

• H₂O

• PCl₃

• NH₃

• BF₃

Which one of the following statements is TRUE?

• One mole of any acid will ionize completely in aqueous solution to produce one mole of H⁺ ions

• At the same concentration, solutions of weak acids always have lower concentrations of H⁺ than solutions of strong acids

• There are several common acids that are insoluble in water

• All of the IA and IIA metal hydroxides are completely soluble in water

• All weak acids are insoluble in water

Which one of the following is a strong electrolyte?

• H₂O

• KF

• HF

• HNO₂

• (CH₃)₃N

Which of the following salts give acidic aqueous solutions?

(1) KNO₃ (2) KCH₃COO (3) NH₄NO₃ (4) RbI

(5) (NH4)₂SO₄ (6) BaCl₂ (7) NaCN (8) KNO₂

• 2, 7, 8

• 3, 5

• 2, 4, 6

• 1, 4, 7, 8

• 1, 4, 6

The following titration curve is the kind of curve expected for the titration of a ____ acid with a ____ base.

• strong, strong

• weak, strong

• strong, weak

• weak, weak

• none of these

As the cell given below operates, the strip of silver gains mass (only silver) and the concentration of silver ions in the solution around the silver strip decreases, while the strip of lead loses mass and the concentration of lead increases in the solution around the lead strip. Which of the following represents the reaction that occurs at the negative electrode in the above cell?

Pb | Pb(NO₃)₂ (1.0 M) || AgNO₃ (1.0 M) | Ag

• Pb²⁺ + 2e^- --> Pb

• Pb --> Pb²⁺ + 2e^-

• Ag⁺ + e^- --> Ag

• Ag --> Ag⁺ + e^-

• none of the above

The half-reaction that occurs at the anode during the electrolysis of molten sodium bromide is:

• 2 Br^- --> Br₂ + 2 e^-

• Br₂ + 2 e^- --> 2 Br^-

• Na⁺ + e^- --> Na

• Na --> Na⁺ + e^-

• 2 H₂O + 2 e^- --> 2 OH^- + H₂