Oxidation and reduction

Oxidation is the _________ of electrons.

• loss

• gain

• sharing

• transfer

Reduction is the ___________ of electrons.

• loss

• gain

• sharing

• transfer

The change of I^‾ to I₂ is ________________

• oxidation

• reduction

• neutralization

• decomposition

• combustion

Identify the species reduced in the following reaction.

Fe_(s) + 2 Ag⁺_(aq) → Fe²⁺_(aq) + 2 Ag_(s)

• Fe

• Ag

• Ag⁺

• Fe²⁺

Which statement is true:

Mg → Mg²⁺ + 2e^–

• Mg gains 2 electrons

• Mg²⁺ loses 2 electrons

• Mg loses 1 electron

• Mg loses 2 electrons

Tags

NGSS.HS-PS1-2

Which of the following half reactions correctly represents a reduction half reaction?

• Fe →Fe²⁺ + 2e^-
• Pb⁴⁺ + 2e^- →Pb²⁺
• 2O^-2 →O₂ + 4e^-
• Fe + 3e^- →Fe³⁺

Tags

NGSS.HS-PS1-7

Which of the following is the correct, balanced half -reaction for the oxidation of Cu to Cu^+2?

• Cu ⟶ Cu⁺²

• Cu + 2 e- ⟶ Cu⁺²

• Cu - 2e- ⟶ Cu⁺²

• Cu ⟶ Cu⁺² + 2 e-

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

In which substance does sulfur have a negative oxidation number?

• Na₂S

• SO₂

• S

Tags

NGSS.HS-PS1-1

If an atom lost electrons, it...

• was burned

• was reduced

• was oxidized

• it became negative

Tags

NGSS.HS-PS1-2

An element's oxidation numbers changed from zero to +2 during a reaction. What happened to that element?

• It was oxidized

• It was reduced

• It was both oxidized and reduced

• It was neither oxidized nor reduced