redox 12

In a voltaic cell, the salt bridge is necessary for

• the movement of electrons to create a current
• the movement of ions to create a current
• the movement of electrons to maintain the neutrality of solution
• the movement of ions to maintain the neutrality of solution

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

• Oxidized
• Reduced

Tags

NGSS.HS-PS1-1

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⁺

What reaction occurs at the anode?

• Ag⁺ + e^- →Ag
• Ag → Ag⁺ + e^-
• Ni²⁺ + 2e^- → Ni
• Ni → Ni²⁺ + 2e^-

Tags

NGSS.HS-PS1-2

What element is being Oxidized?

• N
• H
• O
• S

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which energy conversion shown below takes place in an electrochemical cell?

• Electrical to chemical
• Mechanical to chemical
• Mechanical to electrical
• Chemical to electrical

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

• Zinc
• Hydrogen
• Oxygen
• None

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-4

What is oxidation number of Cr in Cr₂O_7^2-?

• -2
• +2
• +6
• +12

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the reducing agent of this reaction?
3Mg + N₂−−−−> Mg₃N₂

• Mg
• N₂
• Mg₃N₂
• MgN

Tags

NGSS.HS-PS1-2

In electrolytic cell, anode will attract...

• Cations
• Anions