Redox Review Station

Which type of reaction is never a redox reaction?

• single replacement

• double replacement

• synthesis

• decomposition

Which of the following is a redox reaction?

• H₂O₂ --> H₂O + O₂

• Mg + O₂ --> MgO

• Zn + HCl --> ZnCl₂ + H₂

• all of the above

Which of the following is not a redox reaction?

• Fe + CuCl₂ --> FeCl₂ + Cu

• AgNO₃ + NaCl --> AgCl + NaNO₃

• NaCl --> Na + Cl₂

• Cl₂ + NaI₂ --> NaCl + I₂

What is the oxidation number of Na in the compound NaCl?

• 0

• +1

• -1

• +2

What is the oxidation number of pure Na?

• 0

• +1

• -1

• +2

What is the oxidation number of the oxygen atoms in O₂?

• 0

• -1

• -2

• +2

What is the oxidation number of O in the compound H₂O?

• 0

• -1

• -2

• +2

What is the oxidation number of H in HCl?

• 0

• +1

• -1

• +2

What is the oxidation number of C in CH₄?

• 0

• +1

• +4

• -4

What happens when an element is oxidized?

• Its oxidation number increases

• Its oxidation number decreases

• Its oxidation number stays the same