Chemical Cells and Fuel Cells

What is produced by a hydrogen-oxygen fuel cell?

• Water and Carbon Dioxide

• Carbon Dioxide

• Water

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

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

• They react with electrons to form oxide ions, O^2-

• They react with hydrogen ions to form hydroxide ions, OH^-

• They react with hydrogen ions and electrons to form water

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

What is the main reason why hydrogen is more difficult to store than diesel?

• Hydrogen is a gas at room temperature but diesel is a liquid

• Hydrogen can be liquefied by cooling it

• Hydrogen can be stored under pressure

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

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

• The air

• A catalyst

• The fuel

What are the main components of a chemical cell?

• An anode, a cathode

• An anode, a cathode and an electrolyte

• An anode and an electrolyte

• A cathode and an electrolyte

What is an electrolyte?

• An electric current

• The splitting of ionic compounds

• A solution containing ions which allows current to flow.

• The salts in drinking water.

In non-rechargeable cells, why do the chemical reactions stop over time?

• One of the reactants becomes used up.

• The energy has depleted.

• The products are oxidised.

• The electrodes become reactive.