Redox Reactions & Half-Reaction Balancing
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Questions and Answers

What is the oxidation state change of sulfur in the half-reaction from SO32- to SO42-?

  • From +2 to +4
  • From +4 to +5
  • From +6 to +4
  • From +4 to +6 (correct)

Which step is necessary when balancing the oxidation half-reaction involving SO32-?

  • Including additional sulfates to balance charges
  • Adding electrons to the product side
  • Balancing all elements except hydrogen and oxygen first (correct)
  • Using H+ ions to balance electrons

When balancing the half-reaction for SO32- in basic conditions, what must be done after adding H+ ions?

  • Add an equal number of OH- ions (correct)
  • Add an equal number of water molecules
  • Substitute H+ with H2O
  • Remove water from both sides

Which of the following best describes the electron transfer in the reaction between MnO4- and SO32-?

<p>Manganese gains electrons while sulfur loses electrons (A)</p> Signup and view all the answers

What is the correct product in the balanced reduction half-reaction of MnO4-?

<p>MnO4- to MnO42- with electrons (A)</p> Signup and view all the answers

What is the first step in balancing an oxidation half-reaction?

<p>Balance all elements except hydrogen and oxygen (C)</p> Signup and view all the answers

In balancing the oxidation half-reaction of C2H5OH to CO2, how many moles of water are added to balance the oxygen atoms?

<p>3 H2O (A)</p> Signup and view all the answers

When balancing the half-reaction, what is the last step to achieve balance in charge?

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

Which component helps balance the hydrogens in the oxidation half-reaction?

<p>H+ (C)</p> Signup and view all the answers

What is the state of charge on the left side of the oxidation half-reaction before balancing?

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

In the reduction half-reaction of Cr2O72- to Cr3+, how many chromium ions are produced?

<p>2 Cr3+ (B)</p> Signup and view all the answers

What is the oxidation state of chromium in Cr2O72-?

<p>+6 (C)</p> Signup and view all the answers

How is the reaction verified after balancing the oxidation half-reaction?

<p>By ensuring the number of atoms and charge is equal on both sides (C)</p> Signup and view all the answers

What is the purpose of adding H+ to the reduction half-reaction?

<p>To balance the number of hydrogen atoms (D)</p> Signup and view all the answers

Which statement correctly describes the charge balance in the oxidation half-reaction?

<p>The charge remains neutral before and after the reaction (A)</p> Signup and view all the answers

How many electrons are produced in the oxidation half-reaction?

<p>12 e- (A)</p> Signup and view all the answers

What must be true about the number of electrons in the oxidation and reduction half-reactions?

<p>They must be equal (B)</p> Signup and view all the answers

After equalizing the number of electrons, how is the reduction half-reaction modified?

<p>It is multiplied by two (A)</p> Signup and view all the answers

What is the final overall charge after combining the balanced half-reactions?

<p>+6 (D)</p> Signup and view all the answers

Which component primarily affects the balancing of hydrogen in acidic reactions?

<p>Protons (H+) (A)</p> Signup and view all the answers

When balancing the half-reaction, how do you verify the equality of atoms and charge?

<p>Both sides for atom counts and charge (D)</p> Signup and view all the answers

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