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Balancing REDOX Reactions Quiz
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Balancing REDOX Reactions Quiz

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Questions and Answers

Reduction-Oxidation reactions (REDOX reactions) involve the gain and loss of electrons.

True

What method do we use to balance REDOX reactions?

half-reactions method

What happens during oxidation?

  • Loss of electrons (correct)
  • Neutralization
  • Gain of electrons
  • No change in electrons
  • What happens during reduction?

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

    In the same reaction K (s) + Br2 (l) → KBr (aq), what species is reduced?

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

    The oxidation half-reaction for K is K0 → K+ + ______

    <p>1e¯</p> Signup and view all the answers

    In the reaction K (s) + Br2 (l) → KBr (aq), what species is oxidized?

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

    The reduction half-reaction for Br2 is Br20 + ______ → 2Br¯

    <p>2e¯</p> Signup and view all the answers

    What is the balanced overall reaction for 2K (s) + Br2 (l)?

    <p>2K (s) + Br2 (l) → 2KBr (aq)</p> Signup and view all the answers

    Are Au3+ + I¯ → Au + I2 a REDOX reaction?

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

    Are Cu + Ag+ → Cu2+ + Ag a REDOX reaction?

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

    Is BaSO3 → BaO + SO2 a REDOX reaction?

    <p>No</p> Signup and view all the answers

    In an acidic solution, which species in the reaction ClO3¯ + I2 → IO3¯ + Cl¯ is being oxidized?

    <p>I2</p> Signup and view all the answers

    In the same reaction ClO3¯ + I2 → IO3¯ + Cl¯, which species is being reduced?

    <p>ClO3¯</p> Signup and view all the answers

    Study Notes

    REDOX Reactions Overview

    • REDOX reactions involve the transfer of electrons between species, where one species is oxidized (loses electrons) and another is reduced (gains electrons).
    • Charge conservation is maintained through simultaneous oxidation and reduction.
    • Assigning oxidation numbers is crucial for identifying oxidized and reduced species.

    Key Definitions

    • Oxidation: Loss of electrons, increasing positive charge.
    • Reduction: Gain of electrons, increasing negative charge.

    Balancing REDOX Reactions

    • Use the half-reactions method for balancing.
    • Identify oxidation and reduction half-reactions separately.

    Example Problem: Balancing K + Br2 → KBr

    • Assign oxidation numbers:
      • K: 0 (elemental state) to +1 (in KBr).
      • Br2: 0 to -1 (in KBr).
    • Oxidation half-reaction: K → K⁺ + e⁻
    • Reduction half-reaction: Br2 + 2e⁻ → 2Br⁻
    • Balance charges by adding electrons to the appropriate sides:
      • Oxidation: K → K⁺ + e⁻
      • Reduction: Br2 + 2e⁻ → 2Br⁻
    • Multiply the oxidation half-reaction by 2 to equalize electrons:
      • 2K → 2K⁺ + 2e⁻
    • Combine half-reactions, cancelling out electrons:
      • 2K + Br2 → 2K⁺ + 2Br⁻
    • Balanced equation: 2K (s) + Br2 (l) → 2KBr (aq)

    Practice REDOX Reactions

    • Confirm if a reaction is a REDOX reaction and balance it using the half-reaction method:
      • Au³⁺ + I⁻ → Au + I2
      • Cu + Ag⁺ → Cu²⁺ + Ag
      • BaSO3 → BaO + SO2

    Complex REDOX Reactions

    • In aqueous solutions, especially in acidic or basic conditions, protons (H⁺) and hydroxides (OH⁻) play a significant role in balancing charges and species in half-reactions.
    • Example in acidic solution:
      • ClO3⁻ + I2 → IO3⁻ + Cl⁻
    • Assign oxidation numbers to ascertain which species are oxidized and reduced before balancing.

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    Related Documents

    balancing-redox-wkst1.pdf

    Description

    Test your knowledge on balancing REDOX reactions in chemistry. This quiz covers the principles of oxidation and reduction, including how to assign oxidation numbers to reactants and products. Gain a deeper understanding of these essential chemical processes through practice questions.

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