Electrochemistry practice

Electrons always flow from

• cathode to anode

• anode to cathode

Oxidation occurs at the

• anode

• cathode

Electrons are gained at the

• anode

• cathode

An iron nail is put into a solution of copper nitrate, iron is above copper in the activity series of metals, what will happen?

• iron will be reduced
• bubbles of oxygen gas will form on iron nail
• the iron nail will become copper plated
• no reaction occurs

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Given the equation representing a reaction:

2Ca(s) + O2(g) --> 2CaO(s)

During this reaction, each element changes in

• atomic number

• oxidation number

• number of protons per atom

• number of neutrons per atom

Tags

NGSS.HS-PS1-1

Given the equation representing a reaction:

3CuCl₂(aq) + 2Al(s) --> 3Cu(s) + 2AlCl₃(aq)

The oxidation number of copper changes from

• +1 to 0

• +2 to 0

• +2 to +1

• +6 to +3

What are the two oxidation states of nitrogen in NH₄NO₃?

• +3 and +5

• +3 and –5

• –3 and +5

• –3 and –3

Which half-reaction equation represents reduction?

• Cu --> Cu²⁺ + 2^e-

• Cu²⁺ + 2^e– --> Cu

• Ag + e^– --> Ag⁺

• Ag⁺ --> Ag + e^–

Given the equation representing a reaction:

Cd + NiO₂ + 2H₂O --> Cd(OH)₂ + Ni(OH)₂

Which half-reaction equation represents the oxidation in the reaction?

• Ni⁴⁺ + 2e^– --> Ni²⁺

• Ni⁴⁺ --> Ni²⁺ + 2e^–

• Cd --> Cd²⁺ + 2e^–

• Cd + 2e^– --> Cd²⁺

Tags

NGSS.HS-PS1-2

In a redox reaction, the reducing agent will

• lose electrons and be reduced

• lose electrons and be oxidized

• gain electrons and be reduced

• gain electrons and be oxidized