Effect of Concentration on Ecell in Cell Reactions Quiz
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Questions and Answers

In a galvanic cell, how is the potential difference between two electrodes measured?

  • By connecting them to a potentiometer
  • By connecting them to a voltmeter (correct)
  • By connecting them to an ammeter
  • By connecting them to a resistor

    • In the standard hydrogen electrode setup, what is the potential assigned to the SHE?

  • 0.5 volts
  • -1 volt
  • 0 volts (correct)
  • 1 volt

    • What components are needed to make an electrode a standard reference electrode?

  • Temperature at 273K
  • Hydrogen gas at pressure of 1 atm
  • Solution containing hydrogen ions at 0.5 mol dm-3
  • Hydrogen gas at pressure of 100 kPa and solution containing hydrogen ions at 1.00 mol dm-3 (correct)

    • Why are standard conditions necessary for a reference electrode like the standard hydrogen electrode?

    <p>To maintain consistency in potential measurements</p> Signup and view all the answers

    In a cell diagram, how is the hydrogen electrode represented?

    <p>| Pt | H2 (g) | H+ (aq)</p> Signup and view all the answers

    How does changing the concentration of Mn+ ions affect the redox equilibrium in a cell?

    <p>It shifts the equilibrium to the right</p> Signup and view all the answers

    What happens to Ecell as the reactant concentrations drop in a cell reaction?

    <p>Ecell decreases</p> Signup and view all the answers

    What is the relationship between Ecell and the likelihood of a reaction occurring?

    <p>Higher Ecell indicates a more likely reaction</p> Signup and view all the answers

    How does increasing the concentration of Fe2+ and decreasing Zn2+ affect Ecell?

    <p>Ecell increases</p> Signup and view all the answers

    What effect does a temperature rise have on Ecell for exothermic cells?

    <p>Ecell decreases</p> Signup and view all the answers

    What does a positive Ecell value indicate about a reaction?

    <p>The reaction might occur</p> Signup and view all the answers

    How does carrying out a reaction at non-standard conditions affect Ecell compared to standard conditions?

    <p>Ecell decreases</p> Signup and view all the answers

    What is the standard electrode potential for the half cell: Cu2+(aq) | Cu(s)?

    <p>+0.34V</p> Signup and view all the answers

    How can the percentage apparatus uncertainty in a titration be reduced?

    <p>Increasing the volume and concentration in the conical flask</p> Signup and view all the answers

    In the reaction Mg + Cu2+ → Cu + Mg2+, which species is undergoing reduction?

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

    What effect does using a balance that measures to more decimal places have on the percentage uncertainty in weighing a solid?

    <p>Decreases the uncertainty</p> Signup and view all the answers

    What is the standard electrode potential for the half cell: Mg2+(aq) | Mg(s)?

    <p>-2.37V</p> Signup and view all the answers

    How does reducing the uncertainty in a burette reading affect the volume of the titre?

    <p>Increases the volume of the titre</p> Signup and view all the answers

    Which electrode will oxidize and go from right to left in a redox reaction?

    <p>Mg(s)</p> Signup and view all the answers

    What is the impact of using burettes with lower apparatus uncertainty in a titration?

    <p>Decreases the experimental uncertainty</p> Signup and view all the answers

    To determine the Ecell for a spontaneous change, what formula is used?

    <p>Ecell = Ered - Eox</p> Signup and view all the answers

    When looking at a series of measurements, which experiments will have the highest experimental uncertainties?

    <p>Experiments with small readings</p> Signup and view all the answers

    What will happen in a spontaneous change with regards to the Ecell value?

    <p>Ecell will be positive</p> Signup and view all the answers

    How does taking two readings during a titration affect the uncertainty on the titre volume?

    <p>+/- 0.10 cm3</p> Signup and view all the answers

    What type of electrochemical cell is a non-rechargeable cell?

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

    In the primary non-rechargeable cells provided, what is the overall reaction for the Dry Cell example?

    <p>2MnO2(s) + 2NH4+(aq) + Zn → Mn2O3 + 2NH3 + H2O + Zn2+</p> Signup and view all the answers

    What is the standard electrode potential for the primary Lithium–manganese dioxide non-rechargeable cell?

    <p>-3.04 V</p> Signup and view all the answers

    Which component is not present in the conventional cell diagram of the primary Lithium–manganese dioxide non-rechargeable cell?

    <p>| Pt (s)</p> Signup and view all the answers

    What is the oxidation half-reaction for the forward reaction in the Lead acid secondary rechargeable cell?

    <p>PbSO4 + 2e- → Pb + SO42-</p> Signup and view all the answers

    What is the cell potential for the Lead acid secondary rechargeable cell?

    <p>+2.91V</p> Signup and view all the answers

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