Electrochemistry
30 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the primary advantage of fuel cells compared to conventional methods of generating electricity?

  • Higher energy output
  • Higher efficiency due to direct energy conversion (correct)
  • Less maintenance requirements
  • Lower operating costs

    • What is the significance of H2 O2 fuel cells in space exploration?

  • They can operate in extreme temperatures
  • They are lighter than traditional batteries
  • They offer a continuous source of energy (correct)
  • They provide a reliable source of oxygen

    • What is the current efficiency of fuel cells, despite expecting 100% efficiency?

  • 40%
  • 50%
  • 80%
  • 60-70% (correct)

    • What is an environmental advantage of fuel cells compared to conventional energy production?

    <p>They do not cause pollution problems</p> Signup and view all the answers

    What is the main characteristic of primary cells?

    <p>They can be used only once and then become dead</p> Signup and view all the answers

    What is the expression for the emf of a voltaic cell?

    <p>C0.0591 log⁡(R.H.S)/nC₁(L)</p> Signup and view all the answers

    What is the function of the anode in a voltaic cell?

    <p>It is the site of oxidation reaction</p> Signup and view all the answers

    What is the advantage of using voltaic cells in space exploration?

    <p>They are lighter and more compact than conventional energy sources</p> Signup and view all the answers

    What is the primary purpose of regulating the diffusion rates of gases into the cell?

    <p>To achieve maximum efficiency in the fuel cell</p> Signup and view all the answers

    What is the net reaction of the fuel cell described in the text?

    <p>The combustion of hydrogen and oxygen to form water</p> Signup and view all the answers

    What is the primary advantage of fuel cells over conventional energy production methods?

    <p>Higher efficiency and reduced emissions</p> Signup and view all the answers

    What is the significance of the Apollo space programme in the context of fuel cells?

    <p>It was the first space mission to use fuel cells for electric power</p> Signup and view all the answers

    What is the EMF of the fuel cell described in the text?

    <p>1.23 V</p> Signup and view all the answers

    What is the symbol used to represent conductivity?

    <p>κ</p> Signup and view all the answers

    What is the unit of conductivity in SI units?

    <p>S/m</p> Signup and view all the answers

    What is the relation between conductivity and resistivity?

    <p>κ = 1/ρ</p> Signup and view all the answers

    What is the definition of molar conductivity?

    <p>The conducting power of all the ions produced by dissolving one mole of an electrolyte</p> Signup and view all the answers

    How is the conductance of a solution experimentally determined?

    <p>By measuring its resistance</p> Signup and view all the answers

    What is the relationship between conductance and resistance?

    <p>Conductance is inversely proportional to resistance</p> Signup and view all the answers

    Which of the following electrolytes has high conductance in a solution?

    <p>Strong electrolyte</p> Signup and view all the answers

    What is the unit of molar conductance in the SI system?

    <p>S cm^2 mol^-1</p> Signup and view all the answers

    What is the relationship between specific conductance and molar conductance?

    <p>Λ = κ × 1000/M</p> Signup and view all the answers

    What is the unit of equivalent conductivity?

    <p>S cm^2 eq^-1</p> Signup and view all the answers

    What is the relationship between equivalent conductivity and specific conductance?

    <p>Λe = κ × 1000/C</p> Signup and view all the answers

    What is the primary factor affecting the conductance of an electrolyte solution?

    <p>Type of electrolyte</p> Signup and view all the answers

    What is the definition of resistivity?

    <p>The resistance of a conductor of 1 cm length and having an area of cross-section equal to 1 cm2</p> Signup and view all the answers

    What is the SI unit of resistivity?

    <p>Ohm metre (Ω m)</p> Signup and view all the answers

    What is the relationship between conductance and resistance?

    <p>Conductance is inversely proportional to resistance</p> Signup and view all the answers

    What is the unit of electrical conductance in the SI system?

    <p>Siemens (S)</p> Signup and view all the answers

    What is the characteristic of electrolytic conduction?

    <p>It occurs with decomposition of the substance</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser