Test: Chemical Reactions and Equations

What is a voltaic cell?

• A device that requires external energy to convert electrical energy into chemical energy.

• An electrochemical cell that spontaneously converts chemical energy into electrical energy.

• A biological cell that produces electricity.

• A mechanical device that generates electrical energy from solar power.

Answer explanation

A voltaic cell is an electrochemical cell that spontaneously converts chemical energy into electrical energy.

What is the name of the device shown in the diagram?

• Electrolytic cell

• Battery

• Voltaic cell

• Capacitor

Answer explanation

The device shown in the diagram is a Voltaic cell, which is used to generate electrical energy through chemical reactions.

What can half cells look like?

• Tubes or large tanks

• Beakers or much smaller compartments

• Cylinders or large containers

• Plates or flat surfaces

Answer explanation

Half cells can look like beakers or much smaller compartments, which are commonly used in electrochemical experiments to separate the anode and cathode.

What does the salt bridge in a half cell do?

• Heats up the solution

• Allows for the flow of electrons to balance the charge

• Allows for the flow of liquids to balance the charge

• Allows for the ions to balance the charge

Answer explanation

The salt bridge allows for the ions to balance the charge in a half cell by facilitating the flow of ions between the two half cells.

What does a voltmeter measure in a half cell setup?

• Current

• Resistance

• Voltage

• Power

Answer explanation

A voltmeter measures voltage in a half cell setup, making it the correct choice out of the options provided.

What is the general term for an electrode?

• Conductor or insulator

• Anode or cathode

• Wire or switch

• Resistor or capacitor

Answer explanation

The general term for an electrode is anode or cathode, not conductor or insulator, wire or switch, resistor or capacitor.

What is the location of oxidation in a half cell?

• Electrode

• Anode

• Cathode

• Salt Bridge

Answer explanation

In a half cell, oxidation occurs at the anode. The anode is where electrons are lost during the redox reaction.

What is the location of reduction in a half cell?

• Electrode

• Anode

• Cathode

• Salt Bridge

Answer explanation

Reduction occurs at the cathode in a half cell. The cathode is where reduction reactions take place during electrolysis or electrochemical reactions.

What does the wire in a half cell setup carry?

• Ions

• Salt

• Electrons

• Protons

Answer explanation

The wire in a half cell setup carries electrons, which are responsible for the flow of electricity in the system.

What do electrons do in an electrochemical cell?

• Electrons move from the cathode to the anode.

• Electrons remain stationary at the anode.

• Electrons leave the anode and move to the cathode.

• Electrons are generated at the salt bridge.