Electrochemistry Part I: Redox Reactions and Electrochemical Cells
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Questions and Answers

What is the oxidation number of Cl in the compound NaCl?

  • +2
  • 0
  • +1
  • -1 (correct)
  • According to the Redox Reaction Rule 2, what is the oxidation number of an ion?

  • Always -1
  • Dependent on the element
  • Always +1
  • Equal to its charge (correct)
  • In which compound does oxygen have an oxidation number of -1?

  • H2O2 (correct)
  • OF2
  • NaF
  • MgO
  • What is the oxidation number of magnesium in the compound MgO?

    <p>+2</p> Signup and view all the answers

    Which element in a compound always has an oxidation number of -1?

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

    According to the Redox Reaction Rule 4, when is the oxidation number of hydrogen +1?

    <p>When bonded to non-metals</p> Signup and view all the answers

    What is the oxidation number of chlorine in hypochlorous acid (HClO)?

    <p>+1</p> Signup and view all the answers

    In the compound sodium chloride (NaCl), what is the oxidation number of sodium?

    <p>-1</p> Signup and view all the answers

    Which compound demonstrates the Redox Reaction Rule 7 regarding halogens combined with oxygen or fluorine?

    <p>Perchloric acid (HClO₄)</p> Signup and view all the answers

    What is the oxidizing agent in the reaction: Fe2+ (aq) + Co(s) → Fe(s) + Co2+ (aq)?

    <p>Co2+</p> Signup and view all the answers

    What is the reducing agent in the reaction: K (s) + Cl2 (g) → KCl (s)?

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

    In the chemical equation: SnCl2 (aq) + 2FeCl3 (aq) → SnCl4 (aq) + 2FeCl2 (aq), what is being oxidized?

    <p>SnCl2</p> Signup and view all the answers

    What is the defining characteristic of an oxidation reaction?

    <p>Increase in the oxidation number of a substance</p> Signup and view all the answers

    Which of the following describes the role of an oxidizing agent?

    <p>Causes oxidation by accepting electrons</p> Signup and view all the answers

    What does an oxidation number indicate about an atom?

    <p>Whether it loses or gains electrons</p> Signup and view all the answers

    Which process involves a decrease in the oxidation number of a substance?

    <p>Addition of hydrogen to a substance</p> Signup and view all the answers

    What happens to the oxidation state of a reducing agent during a redox reaction?

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

    In a reduction reaction, there is a:

    <p>Gain of electrons to a substance</p> Signup and view all the answers

    What is the primary focus of electrochemistry?

    <p>Relating chemical reactions to electricity</p> Signup and view all the answers

    In electrochemistry, what is the role of oxidation and reduction in redox reactions?

    <p>They occur simultaneously</p> Signup and view all the answers

    What does a redox reaction consist of?

    <p>Two half-reactions</p> Signup and view all the answers

    Why do oxidation and reduction occur simultaneously in redox reactions?

    <p>To balance charges</p> Signup and view all the answers

    What happens in a non-spontaneous chemical reaction with electricity according to the text?

    <p>Reduction reaction</p> Signup and view all the answers

    What process involves the movement of electrons according to the text?

    <p>Oxidation only</p> Signup and view all the answers

    What is the function of the cathode in an electrochemical cell?

    <p>Accepts electrons from the external circuit</p> Signup and view all the answers

    In a galvanic cell, which electrode is the positive electrode?

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

    What happens at the anode in a galvanic cell?

    <p>Loses electrons (oxidized)</p> Signup and view all the answers

    Which component of a voltaic cell causes the movement of electrons through the external circuit?

    <p>Connecting wires</p> Signup and view all the answers

    What type of reaction occurs in a galvanic cell to produce electrons?

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

    What is the role of the salt bridge in an electrochemical cell?

    <p>Facilitates the movement of ions to balance charge</p> Signup and view all the answers

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