Identifying Redox Reactions

If in a reaction, copper is reduced; its number of electrons has:

• Increased

• Decreased

• Remained Constant

• Varies Randomly

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

• Oxidized

• Reduced

What element is being Oxidized?

• N⁺⁵

• H⁺¹

• O^-2

• S^-2

What element is being Reduced?

• N⁺⁵

• H⁺¹

• O^-2

• S^-2

What element is being Oxidized?

• I⁰

• H⁺¹

• S⁺⁴

• O^-2

What element is being reduced?

• I⁰

• H⁺¹

• S⁺⁴

• O^-2

If an atom loses electrons during a chemical reaction, the atom was:

• Oxidized

• Reduced

• Neutralized

• Precipitated

In the reaction Zn + H₂O --> ZnO₂ + H₂

which element, if any, is oxidized?

• Zn⁰

• Zn⁺²

• O^-2

• H₂⁰

• None

What substance is oxidized in the following reaction?
4Fe + 3O₂ --> 2Fe₂O₃

• Iron

• Fluorine

• Oxygen

Cl₂ + 2e- --> 2Cl ^- is an example of:

• a chemical reaction

• redox

• oxidation

• reduction