Quiz on Redox

Oxidation is the _________ of electrons.

• loss

• gain

• sharing

• transfer

Reduction is the ___________ of electrons.

• loss

• gain

• sharing

• transfer

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

• Mg gains 2 electrons
• Mg_²⁺ 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

From the listed standard electrode potentials, what is E^o for the cell:

Mg (s) | Mg2+ (aq) ||Sn2+ (aq) | Sn (s)

Mg²⁺ (aq) + 2 e- ---> Mg (s) E^o = -2.363 V

Sn²⁺ (aq) + 2 e- Sn (s) ---> E^o = -0.136 V

a) +2.499

b) +2.227

c) +1.113

d) -2.227

e) -2.499

• +2.499

• +2.227

• +1.113

• -2.227

• -2.499

The Eo at 25 Co for the following reaction is 0.47 V.

Calculate the    $\Delta$  oG in kJ.

Pb (s) + Cu2+ (aq)--->  Pb2+ (aq) + Cu (s)

• a)   -45

•  b)   +105

•  c)   +91 

• d)   -105 

• e)   -91

Which of the following statements is true?

I. Oxidation occurs at the anode of a voltaic cell.

II. The potential of a cell depends on temperature.

III. Spontaneous oxidation-reduction reactions have E^o < 0.

• a) II & III

• b) I & II

• c) III

• d) I

• e) II

     In the reaction Zn + H₂O --> ZnO₂ + H₂
 which element, if any, is oxidized? 

• Zinc
• Hydrogen
• Oxygen
• None

Tags

NGSS.HS-PS1-2

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

• Increased
• Decreased
• Remained Constant
• Varies Randomly

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