Redox Reactions & Half-Reaction Balancing

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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-?

Manganese gains electrons while sulfur loses electrons Signup and view all the answers

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

MnO4- to MnO42- with electrons Signup and view all the answers

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

Balance all elements except hydrogen and oxygen 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?

3 H2O Signup and view all the answers

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

Adding electrons Signup and view all the answers

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

H+ Signup and view all the answers

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

Neutral Signup and view all the answers

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

2 Cr3+ Signup and view all the answers

What is the oxidation state of chromium in Cr2O72-?

+6 Signup and view all the answers

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

By ensuring the number of atoms and charge is equal on both sides Signup and view all the answers

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

To balance the number of hydrogen atoms Signup and view all the answers

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

The charge remains neutral before and after the reaction Signup and view all the answers

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

12 e- Signup and view all the answers

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

They must be equal Signup and view all the answers

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

It is multiplied by two Signup and view all the answers

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

+6 Signup and view all the answers

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

Protons (H+) Signup and view all the answers

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

Both sides for atom counts and charge Signup and view all the answers