Electrons in a Redox Reaction

In an oxidation-reduction reaction, the element whose oxidation # goes ____ is oxidized and it ________ electrons. The element whose oxidation # goes ____ is reduced and ________ electrons.

• up, loses, down, gains

• up, gains, down, loses

• down, loses, up, gains

• down, gains, up, loses

Determine the oxidation number of each element in Na₂S₂O₃.

• Na: +1, S: +2, O: -2

• Na: +1, S: +4, O: -2

• Na: +1, S: +6, O: -2

• Na: +1, S: +5, O: -2

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Determine the oxidation number of each element in NH₄⁺.

• N: -3, H: +1
• N: +3, H: -1

• N: -4, H: +1

• N: +4, H: -1

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Determine the oxidation number of Cr in Cr₂O₃.

• +3

• +2

• +4

• +6

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Determine the oxidation number of N in NO₃⁻.

• +5

• -3

• +3

• 0

Select the oxidation and reduction in the following chemical equation: 2Al + 3Br₂ → 2AlBr₃.

• Oxidation: Al (0 to +3), Reduction: Br (0 to -1)

• Oxidation: Br (0 to +3), Reduction: Al (0 to -1)

• Oxidation: Al (0 to -3), Reduction: Br (0 to +1)

• Oxidation: Br (0 to -3), Reduction: Al (0 to +1)

Select the oxidizing agent and identify the element that was oxidized in the reaction: 4Al + 3O₂ → 2Al₂O₃.

• Oxidizing agent: O₂, Element oxidized: Al

• Oxidizing agent: Al, Element oxidized: O₂

• Oxidizing agent: Al₂O₃, Element oxidized: O₂

• Oxidizing agent: O₂, Element oxidized: Al₂O₃

Select the reducing agent in the reaction: Fe₂O₃ + 3CO → 2Fe + 3CO₂.

• Fe₂O₃

• CO

• Fe

• CO₂

Tags

NGSS.HS-PS1-2

Identify the element that was oxidized in the reaction: Fe₂O₃ + 3CO → 2Fe + 3CO₂.

• Fe

• O

• C

• CO₂

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Select the reducing agent and the element that was reduced in the reaction: CH₄ + 2O₂ → CO₂ + 2H₂O.

• CH₄ is the reducing agent and O is reduced.

• O₂ is the reducing agent and C is reduced.

• CH₄ is the reducing agent and C is reduced.

• O₂ is the reducing agent and O is reduced.

Tags

NGSS.HS-PS1-2