REDOX RXN

In oxidation, atoms or ions

• increase their oxidation number.
• decrease their oxidation number.
• do not change their oxidation number.
• have a zero oxidation number after the reaction.

In reduction, atoms or ions

• increase their oxidation number.
• decrease their oxidation number.
• do not change their oxidation number.
• have a zero oxidation number after the reaction.

Tags

NGSS.HS-PS1-1

Which of the following are numbers assigned to atoms and ions to keep track of electrons?

• charges
• ions
• coefficients
• oxidation numbers

Fe ---> Fe³⁺ + 3e–
the species Fe is

• oxidized 
• reduced 
• neutralized.
• disproportionated.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

A species whose oxidation number decreases in a reaction is

• oxidized.
• electrolyzed.
• reduced.
• autooxidized.

Tags

NGSS.HS-PS1-2

A species whose oxidation number increases in a reaction is

• oxidized.
• reduced
• electrolyzed.
• autooxidized.

2K + Br₂  --->2K+  + 2Br-
which species is reduced?

• k
• Br₂
• both a and b
• neither a nor b

In the reaction represented by the equation F₂ + Mg -->  2F– + Mg²⁺, which species is oxidized?

• F₂
• Mg
• both a and b
• neither a nor b

Which of the following equations represents an oxidation-reduction reaction?

• H₂ --> 2H
• H₂ + Cl₂ --> 2HCl
• HCl + NaBr--->  HBr + NaCl
• H₂O + SO₂ --> H₂SO₃

Which of the following equations does not represent an oxidation-reduction reaction?

• N₂ + O₂ --->2NO
• H₂ + Cl₂ --> 2HCl
• 2NaBr + Cl₂ --->2NaCl + Br₂
•  Fe --->Fe³⁺ + 3e–