Prelab for Electrolysis SD Flashcards

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general chemistry ii lab
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1

What acts as the cathode (negative end) in this experiment

  • The metal
  • The solution
  • The copper wire
  • The buret
  • The buret clamp
  • The hydrogen ions
  • The hydrogen gas

The copper wire

2

What property of the metal is measured in this experiment?

  • Gain of mass by the metal
  • Conductivity of the metal
  • Resistivity of the metal
  • Loss of mass of the metal

Loss of mass of the metal

3

The purpose of this experiment is to

  • find the molar mass of a metal using moles of hydrogen produced when the metal is oxidized.
  • find the molar mass of hydrogen using moles of metal lost when the metal is oxidized.
  • find the molar mass of hydrogen using moles of metal lost when the metal is reduced.
  • find the molar mass of a metal using moles of hydrogen produced when the metal is reduced.
  • find the molar mass of hydrogen using moles of metal gained when the metal is reduced.
  • find the molar mass of hydrogen using moles of metal gained when the metal is oxidized.

find the molar mass of a metal using moles of hydrogen produced when the metal is oxidized.

4

The H+ in this experiment is

  • oxidized to H2 gas.
  • reduced to H2 gas.

reduced to H2 gas.

5

The barometric pressure of a room at 26 degrees C is found to be 752.0 mm Hg. The vapor pressure of water at this temperature is 25.2 mm Hg. What is the partial pressure of H2 in a buret in this room during a similar experiment to this one?

  • 777.2 mm Hg
  • 752.0 mm Hg
  • 25.2 mm Hg
  • 726.8 mm Hg

726.8 mm Hg

6

How many moles of H2 gas are present if the partial pressure of H2 gas is 0.956 atm, its volume is 0.09500 L, and the temperature is 299 K. (Use R = 0.08206 L atm/K/mol).

HINT : Use PV = nRT

  • 0.00370 moles
  • 270. moles
  • 362 moles
  • 0.00276 moles

0.00370 moles