Electrochemistry Quiz Review

In the reaction 2Ca + O₂ --> 2CaO, what happens to calcium?

• Calcium is oxidized.

• Calcium is reduced.

• Calcium remains unchanged.

• Calcium forms a gas.

What is the salt bridge's function in an electrochemical cell?

• To increase the voltage of the cell.

• To maintain electrical neutrality by allowing ions to flow between the two half-cells.

• To act as a barrier preventing ion flow.

• To store energy for later use.

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

• Oxidized

• Reduced

• Neither oxidized nor reduced

• Partially oxidized

What is a voltaic cell?

• A device that stores electrical energy for later use.

• A type of battery that generates electrical energy from a spontaneous chemical reaction.

• A circuit that converts electrical energy into chemical energy.

• A generator that produces energy from solar power.

What distinguishes an electrolytic cell from a voltaic cell?

• An electrolytic cell requires an outside energy source for a nonspontaneous chemical reaction to occur.

• A voltaic cell requires an outside energy source for a spontaneous chemical reaction to occur.

• An electrolytic cell generates electricity from spontaneous reactions.

• A voltaic cell operates only in the presence of an electrolyte.

What is the balanced half-reaction for the oxidation of Cu to Cu⁺²?

• Cu  --> Cu⁺²  + 2 e-

• Cu + 2 e-  --> Cu⁺²

• Cu  --> Cu⁺¹ + e-

• Cu + 2 e-  --> Cu⁺¹ + 2 e-

Define oxidation in terms of electron transfer.

• Oxidation is the gain of electrons.

• Oxidation is the loss of protons.

• Oxidation is the loss of electrons.

• Oxidation is the transfer of neutrons.

Where does reduction occur in an electrochemical cell?

• At the anode.

• At the cathode.

• In the electrolyte solution.

• At the separator.

What is the role of the anode in an electrochemical cell?

• The anode is where reduction occurs.

• The anode is where oxidation occurs.

• The anode is where electrons are stored.

• The anode is where ions are neutralized.

What is the significance of the electrochemical series?

• It ranks elements based on their atomic mass.

• It ranks elements based on their standard electrode potentials, indicating their ability to be oxidized or reduced.

• It determines the color of elements in a chemical reaction.

• It measures the temperature at which elements melt.