Redox Reactions

Front

Is calcium oxidized or reduced in the following reaction? 2 CaO --> 2 Ca + O₂

Back

Reduced

Front

Which of the following half reactions correctly represents a reduction half reaction? Options: Fe →Fe²⁺ + 2e^-, Pb⁴⁺ + 2e^- →Pb²⁺, 2O^-2 →O₂ + 4e^-, Fe + 3e^- →Fe³⁺

Back

Pb⁴⁺ + 2e^- →Pb²⁺

Front

Reduction is the ___________ of electrons.

Back

gain

Front

Which of the following represents oxidation? C → CH₄, Fe³⁺ → Fe²⁺ , Cl₂ → 2Cl^-, Zn → ZnO

Back

Zn → ZnO

Front

In the reaction Zn + 2HCl --> ZnCl₂ + H₂, which element, if any, is oxidized?

Back

Zinc

Front

Which statement is true:
Mg → Mg²⁺ + 2e^–

Back

Mg loses 2 electrons

Front

Change in oxidation number of silicon in the reaction: SiO₂ + C → Si + CO₂

Back

+4 to 0

Front

Charge on cation

Back

positive, +

Front

What cannot occur during oxidation?

• Gain of oxygen
• Donation of electrons
• Loss of hydrogen
• Decrease in oxidation number

Back

Decrease in oxidation number

Front

Back

0