Heating & Chemical Effects of Current
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 relationship between the mass of ions liberated and the chemical equivalent according to Faraday's second law of electrolysis?

  • m ∝ 1/E
  • m = constant × E
  • m ∝ E (correct)
  • m = constant/E

    • What type of cell has irreversible chemical reactions and cannot be recharged?

  • Secondary cell
  • Lead accumulator
  • Dry cell
  • Primary cell (correct)

    • What is the relationship between the electrochemical equivalent and the valency of an ion?

  • E = A/V (correct)
  • E = V/A
  • E = V
  • E = A × V

    • What is the main difference between a primary cell and a secondary cell?

    <p>The reversibility of the chemical reaction (B)</p> Signup and view all the answers

    What is the name of the cell that stores electrical energy as chemical energy and can be recharged?

    <p>Secondary cell (B)</p> Signup and view all the answers

    What is the physical quantity that the electrochemical equivalent represents?

    <p>Mass of a substance deposited per unit electric charge (D)</p> Signup and view all the answers

    In a secondary cell, what is the condition for maximum power dissipation in the external circuit?

    <p>The efficiency of the cell is 50% (D)</p> Signup and view all the answers

    What is the relationship between the mass of a substance deposited, the electrochemical equivalent, and the electric current in electroplating?

    <p>m = Zi / At (A)</p> Signup and view all the answers

    What is the purpose of a thermocouple, in terms of heat energy?

    <p>To convert heat energy into electrical energy (A)</p> Signup and view all the answers

    What is the term for the ratio of the output power of a cell to the input power, expressed as a percentage?

    <p>Efficiency (D)</p> Signup and view all the answers

    What is the physical significance of the Faraday constant?

    <p>It is a measure of the amount of substance liberated or deposited per unit electric charge. (A)</p> Signup and view all the answers

    What is the primary cause of local action in zinc electrodes?

    <p>The presence of impurities on the surface of zinc. (C)</p> Signup and view all the answers

    What is the purpose of amalgamating zinc rods with mercury?

    <p>To prevent local action by removing impurities. (A)</p> Signup and view all the answers

    What is the result of polarisation in a voltaic cell?

    <p>The weakening of the action of the cell. (B)</p> Signup and view all the answers

    What is the electrochemical equivalent of a substance?

    <p>The amount of substance reacted or formed per unit of electric charge. (C)</p> Signup and view all the answers

    What is the relationship between the temperature difference and the heat released or absorbed in Thomson's effect?

    <p>H ∝ Δθ (A)</p> Signup and view all the answers

    What is the unit of Thomson's coefficient?

    <p>Joule/coulomb°C (B)</p> Signup and view all the answers

    Which of the following effects is observed when a current flows through a conductor with a unit temperature difference?

    <p>Thomson's effect (C)</p> Signup and view all the answers

    What is the direction of heat flow in a positive Thomson's effect?

    <p>From hotter end to colder end (D)</p> Signup and view all the answers

    What is the principle behind the working of a thermocouple?

    <p>Seebeck effect (A)</p> Signup and view all the answers

    Which of the following metals exhibits a positive Thomson's effect?

    <p>Zinc (D)</p> Signup and view all the answers

    What is the application of thermopiles?

    <p>To detect heat radiation (D)</p> Signup and view all the answers

    Which of the following metals shows a positive Thomson's effect?

    <p>Cu (B)</p> Signup and view all the answers

    What is the purpose of a thermopile?

    <p>To detect heat radiation (B)</p> Signup and view all the answers

    What is the Peltier effect used for?

    <p>To cool one end and heat the other end (D)</p> Signup and view all the answers

    What is the effect in which a temperature difference between two junctions produces an electric current?

    <p>Seebeck effect (D)</p> Signup and view all the answers

    What is the effect in which an electric current produces a temperature difference between two junctions?

    <p>Peltier effect (D)</p> Signup and view all the answers

    What is the effect in which a temperature difference along a conductor produces a voltage?

    <p>Thomson's effect (B)</p> Signup and view all the answers

    What is the type of device that uses the Seebeck effect to convert heat into electrical energy?

    <p>Thermopile (A)</p> Signup and view all the answers

    What is the relationship between the heat produced and the current passing through a junction in the Thomson's effect?

    <p>Heat produced is proportional to the square of the current (B)</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser