Hydrogen–oxygen fuel cells

Hydrogen-oxygen fuel cells may be used to drive cars. Platinum acts as a catalyst. The energy produced per gram for three fuels is shown. Which statement is correct and is an advantage of a hydrogen-oxygen fuel cell?

Feb/March 2019

Which of the following statements about hydrogen fuel cells are correct?

Feb/March 2020

Fuel cells that use hydrogen can be used to power cars. Which of the following statements about a fuel cell are correct?

Feb/March 2021

Which gases are employed to generate electricity in a fuel cell?

Feb/March 2023

Which row correctly describes a hydrogen-oxygen fuel cell?

Feb/March 2024

Which of these statements about hydrogen-oxygen fuel cells is correct?

Feb/March 2024

Which of the following statements about hydrogen-oxygen fuel cells are correct?

Feb/March 2025

Which statement concerning the hydrogen fuel cell is not correct?

May/June 2019

Fuel cells serve as energy sources in cars. Which row shows a fuel used in a fuel cell and the products produced?

May/June 2019

Which of the following statements about a fuel cell in a car is correct?

May/June 2019

Which equation shows a reaction that occurs in a fuel cell?

May/June 2021

The equation for the reaction when hydrogen is used as a fuel is shown: $\text{2H}_2 + \text{O}_2 \rightarrow \text{2H}_2\text{O}$. Which statement about this reaction is correct?

May/June 2022

In a hydrogen-oxygen fuel cell that is operating, a separate reaction occurs at each electrode. at the hydrogen electrode: $\text{H}_2 \rightarrow 2\text{H}^+ + 2e^-$ at the oxygen electrode: $\text{O}_2 + 2\text{H}_2\text{O} + 4e^- \rightarrow 4\text{OH}^-$ The electrons released at the hydrogen electrode pass through the external circuit to the oxygen electrode, where they are accepted by the oxygen and water. A hydrogen-oxygen fuel cell is run for some time and four moles of oxygen molecules are used up. What mass of hydrogen is consumed?

May/June 2022

Which statement concerning hydrogen fuel cells is correct?

May/June 2023

Four statements about hydrogen fuel cells are given. 1 The fuel cell changes chemical energy into electrical energy. 2 Within the fuel cell, hydrogen reacts with oxygen. 3 Carbon dioxide and water are formed in the fuel cell. 4 The hydrogen fuel is taken from the air. Which statements are correct?

May/June 2023

The flow diagram illustrates a hydrogen-oxygen fuel cell. Which row indicates the inputs and outputs?

May/June 2023

Which of the following statements about hydrogen fuel cells are correct?

May/June 2023

Which statements about a hydrogen-oxygen fuel cell are correct?

May/June 2024

Hydrogen-oxygen fuel cells can be used to supply power for vehicles. What is generated by the fuel cells?

May/June 2024

Which equation shows the overall reaction taking place in a hydrogen-oxygen fuel cell?

May/June 2024

Hydrogen-oxygen fuel cells and gasoline are both used to power cars. Which statement explains one advantage of using hydrogen-oxygen fuel cells in cars compared with gasoline engines?

May/June 2024

A hydrogen-oxygen fuel cell consumes $630\,\text{dm}^3$ of oxygen. This oxygen for the reaction is obtained from clean, dry air. What is the minimum volume of clean, dry air required to supply this amount of oxygen?

May/June 2025

Which equation gives the overall reaction that produces electricity in a hydrogen-oxygen fuel cell?

May/June 2025

What products are formed in a hydrogen-oxygen fuel cell?

May/June 2025

Which equation shows the overall reaction in a hydrogen-oxygen fuel cell?

May/June 2025

Hydrogen-oxygen fuel cells can be used to drive vehicles. Which statement concerning hydrogen-oxygen fuel cells is correct?

May/June 2025

Inside a hydrogen fuel cell, hydrogen and oxygen react with one another. The diagram shows a hydrogen fuel cell.

Oct/Nov 2017

Which gases are consumed in a fuel cell to produce electricity?

Oct/Nov 2019

Which gases are used in a fuel cell to produce electricity?

Oct/Nov 2019

Which gases are used in a fuel cell to produce electricity?

Oct/Nov 2019

Hydrogen and the isotope uranium-235 are both used to produce electricity. What term is used to describe the change that happens to both substances in this context?

Oct/Nov 2020

Hydrogen serves as a fuel in rockets, and it is also employed in hydrogen fuel cells. Which statements are correct?

Oct/Nov 2021

A fuel cell is employed to generate electricity. What chemicals are involved in a fuel cell?

Oct/Nov 2021

Which statement concerning a hydrogen-oxygen fuel cell in a car is correct?

Oct/Nov 2023

Which of these statements about hydrogen–oxygen fuel cells are correct?

Oct/Nov 2023

Fuel cells are used as energy sources in cars. Which row gives a fuel used in a fuel cell and the products produced?

Oct/Nov 2023

Hydrogen-oxygen fuel cells may be used to run cars. Which processes generate the fuel used in a hydrogen-oxygen fuel cell?

Oct/Nov 2024

Which statement explains a benefit of using a hydrogen-oxygen fuel cell in a car rather than a gasoline engine?

Oct/Nov 2024

Which statement about a hydrogen-oxygen fuel cell is incorrect?

Oct/Nov 2024

Which equation shows the reaction occurring in a hydrogen-oxygen fuel cell?

Oct/Nov 2025

Three statements concerning a hydrogen-oxygen fuel cell are provided. Which of the statements are correct?

Oct/Nov 2025

Hydrogen-oxygen fuel cells are used in electric cars. Three statements concerning these fuel cells are given. Which statements are correct?

Oct/Nov 2025

In a fuel cell, a fuel is oxidised to generate electricity. Which row shows the fuel and the oxidising agent that are used?

Oct/Nov 2025