ELECTROCHEMISTRY

Multiple Choice

What occurs to the mass of copper electrode in the following reaction?

Zn/Zn²⁺ // Cu²⁺/Cu

• increases

• decreases

• remains the same

Multiple Choice

What would be the theoretical cell potential of the previous electrochemical cell?

Ag⁺/Ag = 0.80V

Ni²⁺/Ni = -0.25V

• 1.05V

• -1.05V

• 0.55V

• -0.55V

Multiple Choice

Reference electrode that is universally used whose reduction potential value is zero is

• SHE

• Calomel electrode

• chlorine electrode

• standard zinc electrode

Multiple Choice

What unit of measurement do we use to measure electrical potential?

• Watts
• Volts
• Amps
• Ohms

Multiple Select

the hydrogen fuel cell is made up​ of .....

• two electrodes

• one electrode

• just one a negative electrode

• a negative electrode and a positive electrode

Multiple Choice

does Hydrogen ​

- oxygen fuel cell need recharging?

• yes

• no

Multiple Choice

Why does the voltage from a chemical cell that is connected in a circuit with a lamp eventually reach zero?

• The lamp breaks

• One of the reactants is used up

• The circuit becomes broken

Multiple Choice

What happens to hydrogen molecules in a hydrogen-oxygen fuel cell?

• They form hydrogen ions, H⁺ , and electrons, e^-

• They form hydrogen ions, H⁺ , and electrons, e⁺

• They form hydrogen atoms, H

Multiple Choice

Which of these is a disadvantage of cars driven by hydrogen-oxygen fuel cells rather than by petrol engines?

• They have fewer moving parts

• There are fewer suitable filling stations

• They emit little pollution

Multiple Choice

What is a strength of using hydrogen-oxygen fuel cells in manned spacecraft, compared to using chemical cells?

• They produce electricity

• They produce water that the astronauts can drink

• They produce a voltage

Multiple Choice

In a hydrogen fuel cell used to power a car, where does the oxygen come from?

• The air

• A catalyst

• The fuel